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Pentium 4 Overclocked to 7.1GHz, Sets World Record
Netmonger writes "This Japanese guy
overclocked a Pentium 4 to 7.132GHz!! The system managed to calculate pi to 1 million decimal places in 18.516 seconds, setting the world's record." The article notes that a Pentium 4 had been overclocked faster earlier this year, but at that speed it was not possible for the machine to function beyond BIOS. Of course, they'd yet to try diverting power from the dilthium crystal reactor to the deflector array.
Yes.
He overclocked the Intel Pentium 4 670 processor with stock speed of 3.80GHz.
The processor system bus was overclocked to 1520MHz.
processor's voltage was pumped up to 1.70V, significantly higher than default setting; memory latency settings were CL4 3-3-4, memory voltage was set to 2.3V.
Still no word on what his 3dmark2005 score was! (CPU and Total, of course)
Link to the actual forum posting, complete with pics.
p ?t=70225&page=5&pp=25
http://www.xtremesystems.org/forums/showthread.ph
Calculating pi is a series of mathematical operations where you can't do the next one without the prior because you need the remainders. Supercomputers are super due to a heck of a lot of CPUs all working on different parts of a problem that can be broken into chunks. How exactly do you break a series of operations that depend on the priors into chunks for a supercomputer to rip through? So anyway, it looks like this calculating pi is a record in general, not for just a PC. It's a speed job for a single CPU.
I tried the same test on my 2Ghz P4 Northwood with 768MB RAM. It took 1min 34sec to calculate pi to 1 million digits.
Here you go Clicky
There is another kind of evil which we must fear most, and that is the indifference of good men. -- Boondock Saints
Not true. You can get any digit in base 16 of pi without needing to know any other digit. This means you can get groups of digits in any base by only calculating a relatively small (maximum 16 * base) number of other digits in base 16 and converting.
That's not exactly true, you can compute the Nth binary digit of PI without the need of the previous one. Here is the guy who discover it : http://fabrice.bellard.free.fr/pi/
Calculating pi is a series of mathematical operations where you can't do the next one without the prior because you need the remainders. Supercomputers are super due to a heck of a lot of CPUs all working on different parts of a problem that can be broken into chunks. How exactly do you break a series of operations that depend on the priors into chunks for a supercomputer to rip through?
Use the BBP Formula. Pifast is just a benchark, like all benchmarks it's rather silly. The record is for PCs, the top 500 supercomputers are benchmarked using another silly benchmark (LINPACK).
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Someone has already clocked up an extra 150MHz!
p ?p=1001108#post1001108
Calculating 1m decimal places of Pi now down to 18.093s...
http://www.xtremesystems.org/forums/showthread.ph
FASTPI != SuperPi...
it's just two paragraphs for $DEITY sake.
Ok, I'll tell you, lazy boy: besides cooling with liquid N2, they tweaked the processor and the memory voltages.
It's better to be the foot on the boot than the face on the pavement. ~~ tkx Kadin2048
On a *SERIOUS* note, it's about as fast as a 3.5 or 4GHz Pentium M by my estimates...
He was using super pi.
1 815&page=3
t 5459.html
Some stats: http://www.pcstats.com/articleview.cfm?articleid=
http://www.planetamd64.com/lofiversion/index.php/
I'm not sure about fastpi. But pifast appears to allow 2-4GHz computers to do 10 million digits of pi in about 30 seconds.
Calculating pi is a series of mathematical operations where you can't do the next one without the prior because you need the remainders.
Leaving aside the BBP algorithm which several other people have mentioned, you're mostly correct here.
How exactly do you break a series of operations that depend on the priors into chunks for a supercomputer to rip through?
But you're going a bit astray here. Large classical computations of Pi are exercises in performing big Fast Fourier Transforms; and there are very good algorithms for doing those in parallel. Using the AGM or a Borwein iteration, computing a million digits of Pi requires approximately 200 full-length FFTs plus some additional linear-time trivially parallelizable work.
So anyway, it looks like this calculating pi is a record in general, not for just a PC.
Give me a 4 processor 3.8GHz Pentium 4 system, and I can beat the reported time by a factor of two. If you can do parallel FFTs, you can do a parallel classical computation of Pi.
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Certainly not even for a single CPU. Performance of SuperPI (using Gauss-Legendre series) sucks by today's standards in comparison to the programs using Chudnovsky elliptic curve algorithm. QuickPI spits out 1 million digits in about 5 seconds on an Athlon-XP.
Yes, but you still cannot do it in constant time. To compute the nth digit in base 10, you need at least quadratic time. So adding more CPUs to the calculation of Pi does not necessarily scale well.
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Apple calls it liquid cooling when in fact it's a bunch of heatpipes transfering the heat towards the radiator. Nothing too impressive.
There are no reservoirs or tubes or pumps so its not "actually" liquid-cooled hardware unlike what most of us think liquid cooling is which involves the above.
Your statement is true on its face, but do you really understand why this guy could get his chip to overclock so high? He's not cooling it in LN2 just to keep it from melting (although that is certainly very important).
At low temperatures, typical silicon transistors operate much faster, and wires have less impedance, thus allowing a properly-designed chip to operate correctly at a much higher frequency than it would normally be able to achieve.
It's certainly not useful for a user who wouldn't have a constant source of LN2 available, but the fact that it can be done makes some interesting engineering scenarios possible.
The last set of great overclocked CPU's were the Celeron 300's. Many of those went to 450-500 MHz with no problem. A very few could be made to hit 600 MHz, though it is questionable on how reliable they were at that point. Certainly reliable enough to calculate the value of PI quickly; but you wouldn't want one for reliable web server.
Granted, some of the one's which could do 450-500 MHz were made for that speed, and then sold as 300's. But certainly not all of them.
The bottom line is that cherry-picking your CPU's helps lead to a better chance of success with overclocking.
The best way to predict the future is to create it. - Peter Drucker.
That may be a SuperPi world record, but definitely not the overall record: Steve Pagliarulo's QPi can compute 1 million digits of Pi in 6.68 seconds in a Pentium 4 1.6 GHz box. You read that right.
BTW, the same computer takes 189 seconds to compute 2^20 (~1 million) digits using SuperPi. Among the community of Pi-calculating programmers, it's well known that SuperPi is terribly slow. I don't know why overclockers still hang on to it when most programs out there for calculating Pi are faster than it.
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