How Neuros Built Their Nearly Silent HTPC
JoeBorn writes "Neuros has a blog posting discussing how they created their latest 'thin' HTPC to be nearly silent. Instead of using a net-top architecture (Atom or the like) they used a full 2.7GHz CPU and put their effort into making that nearly silent. The article talks about their efforts on fan selection, placement, control, and vibration dampening. This route was chosen to 'give more headroom' for CPU-hungry apps (web and otherwise) including Adobe Flash. Their solution costs $279; is this an appropriate trade-off for a device powering your TV?"
Vibrations may be damped. Vibrators may be dampened.
Damping absorbs vibrations. Dampening is caused by moisture.
sounds like a cool technology
/. claims it's first Nearly Silent HTPC.
An HTPC is likely to be left on 24/7 for recording, etc. Being power efficient is important under those circumstances.
Give me Classic Slashdot or give me death!
silentpcreview.com is where users should go. the linked story isn't any different from the many forum posts describing silent systems people have made
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what is the power use of a cable card tuner?
"This is one slashvertisement I'd like to read", I thought to myself, but I was disappointed, because I expected lots of pictures and details, which I didn't get.
Some of my favourite people are from th US; Vonnegut, Chomsky, Bill Hicks.
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I gave up hitting refresh after so many memory errors.
Try the Coral Cache until their server comes back to life:
http://open.neurostechnology.com.nyud.net/content/Silent_HTPC
[Fuck Beta]
o0t!
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If we push it just a little bit harder, their web server will catch fire and then stop completely. THAT will really be a silent PC!
We've just released a practically silent Neuros LINK v1.2 (codenamed "Phantom") and figured some of you would be interested in the process.
Of course, there are easier ways to create a silent computer, the easiest being a net-top solution, with an Atom processor or the like. We've decided not to go that route with the LINK simply because we didn't want to make the sacrifice on CPU horsepower. Sadly, as we all know, there are still plenty of web apps and inefficient video streams that require CPU cycles. Instead, we architected a full power PC to be silent (or silent to an excellent approximation anyway) Click more to see what it took, or if you just want to buy, go here: we're good with that too.
1. Low power components: (45W CPU, no optical drive or HDD, nothing extra) less power means less heat generated in the first place, thus less for fans to need to remove. Although its a 2.7GHz CPU, the Sempron 140 still only consumes 45W, so we felt that was a nice tradeoff between performance and a manageable amount of heat.
2. Better Fans: We employed large, expensive, 120mm fluid dynamic bearing fans that are about as quiet as computer fans get. In fact they are pretty much silent save for the air they move.
3. vibration dampening neoprene mounts dampen any vibration before it causes noise. Vibrating sheet metal is a great source of very annoying noise and strategically placed vibration dampeners are very important.
4. Intelligent Fan control: We implemented the PWM (pulse width modulation) scheme to control fan speed throughout the system so that the fans would spin down (in a coordinated way) under normal use and only spin up when needed under heavy load (or in a closed cabinet where airflow is limited).
5. Elimination of most moving parts in addition to reducing power (and heat), the elimination of optical drives and harddrives means the elimination of the noise they generate. The flash drive used on the LINK is obviously silent (certainly to the unaided ear anyway)
6. Intelligent fluid dynamics of the entire system. One of the obvious benefits of controlling the whole system is that we have access to architect all the assembled parts when together, not just individual pieces. Thus we were able to replace the 70mm CPU fan with a larger, quieter 120mm fan that generates enough excess airflow that it can be used, in conjunction with a well placed power supply fan, to draw air to cool the north and south bridge chipsets of the motherboard well. If you open the case of the LINK, you'll find the components form a carefully developed airflow channel that covers the CPU, GPU, memory and power supply. Although the power supply is capable of running passively without a fan at all (it only operates at maximum ~40% of capacity in the LINK) we placed another fluid dynamic bearing fan to draw air into the power supply because it aided in creating the airflow channel needed. It also gives more headroom in case you do want to expand the LINK.
Although not obvious at first glance, there are a host of important details that were necessary to reduce noise levels to the level you'll find in the LINK. As one example, open the LINK case and you may notice there are standoffs that separate the main fan from the case by 10.5mm This distance was arrived at through careful research and testing. Place the fan too close to the case vents and turbulence is created that generates audible noise, too close to the heat sink or other components and you disrupt the airflow channel and not only generate noise, but also adversely affect the cooling.
So how quiet is the Phantom? 20 dB or less typically, but if that means nothing to you, put a different way, sitting on the couch 6 feet away, its probably less
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- it's so silent, nobody can hear it scream.
You can't handle the truth.
just my loose change
ideopath @ play
Without a DVD drive, how do you play DVDs with it? Without a hard drive, how does it record and play back TV, downloaded content, etc? I know they have a flash drive for storage, but there's no way they can get the necessary capacity. I have a 1TB HD for my DVR and need a second. It costs thousands of dollars to get that kind of capacity in SSD form. Eliminating rotating storage to reduce noise seems like it's throwing the baby out with the bathwater.
dom
Uhhh, not really seeing what the big deal is here. I made something similar about a year ago for about the same price. E5200 proc on a mATX board, booting off a USB thumbdrive, all housed in an Antec Fusion case. It's got the low-power components, PWM fans, vibration damping, etc etc etc. Guess I shoulda put some up for sale. I coulda had some free advertising from Slashdot for the "miracle" I pulled off by thinking about things a little bit.
I know I've posted this on every single discussion involving the Atom ... but I have to say it again:
The Atom processor is amazingly powerful. The Atom 330/510 are dual core, 2 threads per core processors @ 1.6ghz. They are fucking amazing. And if your apps are well developed, and they can take advantage of multicore machines, it's a very powerful platform. I've seen some netbooks (based on Atom 270, single core, 2 threads) with windows that just crawl at doing just about anything but basic web browsing. But that's because windows sucks, not because Atom sucks. Try getting an Intel mini-atx Atom 510 based mobo and put 4 gb of ram in there. Using the embedded GMA intel card, I can run compiz at full speed @ 1990x1200 with all visual effects turned on, plus chrome with 30 open tabs, while gcc is compiling something on the background and still have a great performance. One of the appliances I develop (security) is based on an Atom 330, and we can run 16 ffmpegs encoding MPEG4 video @ 720x576 just fine. And you can run the 510 essentially fan-less by just adding a slightly better heatsink. It uses very little power, it runs very well, and completely quiet. For a completely silent machine, all you need to do is get one of this mobos in their 12v version, add an external laptop power brick, remove the fan and add a better heatsink. Or just use the 270 version (single core, 2 threads) that is completely fanless out of the box.
Noone needs a fucking 2.8Ghz dual core processor just to run flash video, all you need is a better OS and a little optimization.
BTW: This Intel mobos I'm mentioning are mini-atx and retail for ~$80, processor and everything. That is, mobo+cpu for 80 bucks. Nothing beats the Atom.
WTF am I doing replying to an AC at 5 A.M on a Friday night?
Its quiet, not silent. Last silent system I built is carved out of a solid chunk of aluminium. No fans, no moving parts at all.
"Have you ever thought about just turning off the TV, sitting down with your kids, and hitting them?"
Has most of the relevant points, and a non-slashdotted link (no pun intended)..
The difference between spam and poop is that you don't have to dig through septic tanks looking for real food. -- Me
I, a 22 year old nerd, have been building fanless, high performance machines that are silent since the 90's. My first PC I built when I was 12 was silent. A fanless gaming machine. Rubber o-rings kept the loudest part, the hard drive, from making noise. The power supply fan was removed, and the case slotted to allow passive convection cooling. This is a really unimpressive "break through." My 2 cents.
Neuros is good with Open source - but products are shitty. I purchased one of their products - Neuros Media Center - and the marketing is so full of BS. The product lies in my junk pile waiting to be thrown out.
For starters - look at the product here in Amazon: http://www.amazon.com/s/ref=bl_sr_electronics?ie=UTF8&search-alias=electronics&field-brandtextbin=NEUROS looks cool huh ? Did you know that the infra red port is on the side ? So the product cannot be aligned parallel to the tv it has to be perpendicular. Next - their crappy UI. The UI sucked!!
$250 down the drain.
I think neuros products are best for those looking to hack - nowhere close to mainstream usage!
How are we supposed to know what to make of "How Neuros Built Their Nearly Silent HTPC" when you use acronyms that almost nobody knows?
Yeah, I know this is Slashdot, but it would be really great if you actually knew even a little about what you're talking about.
Just about all of the Intel Atom 510-based mini- ITX systems already have fanless heatsinks.
http://www.intel.com/products/desktop/motherboards/D510MO/D510MO-overview.htm
If this mobo is properly enclosed, no fans are needed at all if you are using a picoPSU type DC power supply.
http://www.mini-box.com/DC-DC
The previous generation Atom, the 330, required a fan, but not for the CPU: Intel shipped their 330-based boards with the relatively energy-inefficient 945 chipset, and that did require active cooling, although some modders replaced the horrendously noisy stock cheapass fan with either better fans (ie quieter) or with big heatsinks in order to avoid the use of a fan at all.
The Atom 330 is actually a truly excellent little system, if you can live with the noise of the stock fan, or are willing to replace it with something better. (Meaning just about any other fan available on the market - THANKS, INTEL!!!)
The Atom 510-based systems are better in that, while not a huge improvement CPU-wise, the new NM10 chipset used in place of the older 945 is vastly superior. Total power consumption of these 510 mobos is miniscule.
If your primary concern is a bleeding eyeball HTPC system the ION-based mini-ITX/Atom mobos are still the better choice, but for almost anything else (general use, or server/firewall/gateway, or remote solar-powered systems, etc), the Atom 510 is hard to beat. Even the Atom 330 is more than good enough: the 945 chipset maybe be inefficient when compared against the 510, but it's still far better than that used by most other mobos.
flash storage is bad for video a ram disk is to give a box a small live tv buffer / vod buffer with out a HDD but a SDD is to high cost / may burn out.
I am already using a "Mac mini" for my HTPC solution and it is pretty much silent. While I don't claim this to be the yard stick to measure by, I would be interested in seeing how quiet this computer is in comparison and how other HTPC oriented solutions compare, especially ones with non-netbook processors. I did look at buying the Shuttle X27D a while back, but it ended up being about the same price as the mini for the same, or reduced, features. I also looked at putting my own together with a mini-itx motherboard and a case designed for fanless computing, but I often found the cases were out of my budget.
Jumpstart the tartan drive.
I find fans with ball or "fluid" bearings to be noisier than sleeve/bushing bearings with more noticeable tonals than broadband noise. They are only preferred because they outlive the cheap sleeve type fans. If you compare fans across a given size, you'll find that the noise level is proportional to the cfm/rpm irregardless of the brand.
So the important thing for a quiet fan is go big and go slow. Or for silent, go fanless. Use a heat pipe to channel the heat out to a heatsink on the back of the chassis. There are standard PC power supplies out there that do just this. There are passive cases which pull the heat from the CPU into the chassis. I don't see where this setup is anything special, myself.
Why does it have to be silent? Sure quiet is nice but you're watching LOTR with the 7.1 Surround sound and you're worried about 30dB coming from your HTPC.
I doubt a good SDD will burn out anytime soon:
http://www.storagesearch.com/ssdmyths-endurance.html
I'll sum it up for you, a 64GB drive constantly being written to at 80MB/s will burn out in approximately 51 years.
The article is assuming you rewrite the whole drive but there is a faster way to destroy a SSD. What I have seen is that a 64GB SSD drive usually has 64GB available to the user, not 64GiB (this is how much it actually has flash memory). The difference in sizes is used for write leveling and reallocating faulty cells. So the fastest way to destroy this kind of flash is first write 64GB to it and then keep rewriting the same small area continously. The write leveling cannot use already allocated 64GB area, so the writes all go to the area between 64GB and 64GiB (4.719GB or 4719476736B). This can be used up much faster than 51 years. At 80MB/s writes, you reach 100.000 rewrites to all of the cells in 68 days and million rewrites in two years. And SSDs are faster then 80MB/s nowadays so maybe you can kill your SSD in a month to a year. Ofcourse this is obviously not even close to a realistic "normal" usage on a SSD.
- Raynet --> .
So buy a cheap SD card and replace it next year. How is this difficult?
Power = heat. Their very first point in the article...
1. Low power components: (45W CPU, no optical drive or HDD, nothing extra) less power means less heat generated in the first place, thus less for fans to need to remove.
Buckle your ROFL belt, we're in for some LOLs.
It ran for about 5 minutes before the CPU fried.... does that qualify?
Sometimes the light at the end of the tunnel is the headlight of an oncoming train.
The video you see in Flash is ISO H.264.
An AppleTV has only a 1GHz Pentium M and it does full-screen HD playback of ISO H.264 in its NVIDIA GPU. No fan is needed. No special engineering. Same as a DVD player.
The GPU on Atom systems, NVIDIA Ion, has hardware H.264 decoding that can play HD without much help from the CPU at all.
So in this device you're putting a much bigger CPU and an arrangement of fans in your living room to enable Adobe to continue to lock up ISO video behind their proprietary software video player.
Yeah, that makes no sense at all.
And of course, we all know it's not Adobe's fault there is no FlashPlayer on mobiles yet, 3 years after iPhone. It's Steve Jobs that is keeping Flash off your Blackberry, Android, and Palm phones. Right?
When you consider the Flash tool costs $599, it is expensive at every level.
When you add up all of that, it isn't hard to imagine that it costs us all a combined 16 billion dollars a year to use Flash compared to if it didn't exist and we were running bare ISO H.264 video in the hardware decoders that are built into every device. Adobe is only worth 16 billion. It doesn't make sense.
Many Sanyo TV's now have a computer embedded in them running Linux. You can hack them to add many capabilities.
http://sourceforge.net/apps/mediawiki/samygo/index.php?title=Main_Page
I built a box about 15 months ago, and as I type this on one monitor (22" Samsung 2270), I'm watching the masters I recorded off TV (digital HDTV) on the other monitor (also a 22" Samsung P2270). The processor is a Corei7-920 (that should be enough to power the hungry apps.), cooled with a Thermalrite True 120 (Thermalrite Ultra Extreme 120). Graphics is powered by an Nvidia 9600GT (passive air cooled), and fan noise is virtually non-existent. Two 500GB hard disks (there are 3 in the box....room for 6 actually) but one is unplugged are kept nice and quiet. The Coolermaster Cosmos case is mostly aluminium except for the heavy padded insulation on the inside. For such a hi-horsepower box (anything bigger either demands water or more significant airflow), its very quiet. The box is big though, and there are a lot of fans (2 4" pulling in air from below, one 4" fan in front, two 4" fans on top, and a 4" fan on the back, about 2" from the 4" fan connected to the CPU cooler (120mm wide, 120mm high and about 40mm wide). There is also a 1.5" fan attached to a motherboard chipset heat pipe/heat sink, and the power supply fan. The big fans are all thermal/speed controlled, and the power supply fan is heat/speed controlled, but independently of each other. A big box means all that moving air is quiet.
It doesn't have a drive (though it does have slots for one), and therefore it expects the user to either stream everything to it, or have a network drive mounted. Most people, even most hackers, don't have a separate file server. Seems like a very low powered, implementing wake on lan, would be good product. Yes, this is a nothing more than a NAS, but most NASs I've seen are loud and not exactly power efficient. (i.e. nothing you want in your living room)
Anyone have any suggestions for this problem?
If I've carefully followed the ongoing battle/war between Adobe and Apple, Adobe keeps telling that Flash has no specific power requirement.
And now, even desktop (errr, HTPC) need to beef up to cope with the task.
I have an idea. Put your TV up against a wall, put your desktop computer up against the same wall, but on the other side, in another room. Drill a hole through the wall and pull the requisite cables through the hole. Find some sort of remote control for the desktop machine.
Now your computer can be as loud as it wants.
Filters, every fan should have one. I wish there were standard 120mm mounted filters. Think about all the dust that DOES end up in your case and you'll realize it's a great way to filter the air. Also dampening is awesome.... get with it case manufacturers.
This is clearly identity theft of Mr. Cluelessicus; prepare for black suits to come and get you.
This man is rich, he's known anywhere around the world.
--- I am known for the ones who want to find me on the net. Is that a privacy risk or a privilege? One might wonder..
I just have a nice laptop (HP 6910p) with a docking station. Super quiet, super low power but far from underpowered with a 2.5GHz Core2Duo. Best of all - it's perfectly suitable for my needs. The docking station has a DVI output and DVI-to-HDMI cables are quite easy to come by.
With a bit of help from ebay, this can be had for about £250 (~$300) with no tinkering whatsoever.
When I converted my old AMD system into an HTPC, I spent a ton of time reading reviews and How-To's at SPCR. I'm now extremely happy with it, since the TV (on mute) makes more noise than my HTPC. Sitting in the corner of the room, you need to check for the blue LED to know it's on. I'm running an undervolted quad core with a giant heat sink and 500RPM fan (which can actually be turned off) a passively cooled video card (again with a large heat sink) low RPM hard drives for movie storage, all in an acoustically padded case with more 500RPM fans to maintain a minimal air flow.
Anyone committed to making a silent PC can do it with off-the-shelf parts now a days. It's a dead simple formula: Low Power Components + Large Heat Sinks + Low RPM Fans + Quality Acoustic Case = Silent.
From the article:
"2. Better Fans: [...] In fact they are pretty much silent save for the air they move."
Well, that is what sound is.