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Here is your Radeon HD7850: http://www.gpureview.com/Radeon-HD-7850-card-678.html

It has 1024 Shader Processors ("Radeon Cores" in the summary), and (stock) is clocked at 860MHz. The 8670D included in this new APU has 384 Shader Processors, and is clocked at 844MHz. So about 2/5ths of the computing power; presuming all other factors are equal.

So while for high-end gaming, it won't quite cut it (Turning on most of the shiny and enabling it across 3 monitors with Eyefinity would make it beg) - it should be plenty powerful for light/medium gaming on a single monitor, or any light/moderate duties across multiple monitors with Eyefinity.

Connecting to an HD TV
Nokia N8 and EVO 4G, for example, have a HDMI port to connect to a HD TV.

GPU Power
The current Smartphones can put up to 1000 MPixels/sec (see http://alienbabeltech.com/main/wp-content/uploads/2010/04/Cellphonehardwarecompari1.png). For example, an ATi Radeon HD 2400 Pro PCI-E produces 2100 MPixels/sec (see http://www.gpureview.com/show_cards.php?card1=525&card2= )

RAM
iPhone 4 has 512MB of RAM, the same as the XBOX 360.

With new cores, such as ARM Cortex A9, the computing power of these devices will further increase.

You can find more info at:
http://alienbabeltech.com/main/?p=17125 (Hummingbird vs. Snapdragon: The 1 GHz Smartphone Showdown)

Check out GPUReview's video card compare and see what the theoretical performance differences are:
http://www.gpureview.com/show_cards.php

It does appear that the just announced cards aren't listed on that site yet to compare against unfortunately.

I haven't tried it, but the only reason I can see that it would require a better CPU is because it's using software physics. Other new games that use NVIDIA's PhysX run just fine on my PC since both the graphics and physics processing are offloaded to my GPU. If I want to play GTA4 then I might get a new CPU, but this little P4 has had a very long run and is still capable for most things. A quad core Phenom and new motherboard will cost me less than $200 USD. All of the other hardware could be transplanted from the P4. With something like that, GTA4 would run and I'd still have extra power to burn.

If your brother has a decent dual core setup, then a 512MB 9800GT would be more than adequate to run GTA4. The 8600GT is listed as their recommended requirement and the 9800GT is on the order of 3-4 times as powerful as that. A good site for finding specs on the various GPUs is www.gpureview.com. Here is a technical comparison between the 8600GT and 9800GT.

Adaptable settings are NOT a red herring. Many gamers will tone down their settings to get playable framerates, especially for online games. Some games offer higher levels of control, so for example you could reduce the details of specific things that aren't as noticeable in game.

The GTA SA comparison isn't a good one. The PC version of GTA SA was practially a new game since it was completely overhauled to take advantage of the more powerful PC hardware.

I haven't tried it, but the only reason I can see that it would require a better CPU is because it's using software physics. Other new games that use NVIDIA's PhysX run just fine on my PC since both the graphics and physics processing are offloaded to my GPU. If I want to play GTA4 then I might get a new CPU, but this little P4 has had a very long run and is still capable for most things. A quad core Phenom and new motherboard will cost me less than $200 USD. All of the other hardware could be transplanted from the P4. With something like that, GTA4 would run and I'd still have extra power to burn.

If your brother has a decent dual core setup, then a 512MB 9800GT would be more than adequate to run GTA4. The 8600GT is listed as their recommended requirement and the 9800GT is on the order of 3-4 times as powerful as that. A good site for finding specs on the various GPUs is www.gpureview.com. Here is a technical comparison between the 8600GT and 9800GT.

Adaptable settings are NOT a red herring. Many gamers will tone down their settings to get playable framerates, especially for online games. Some games offer higher levels of control, so for example you could reduce the details of specific things that aren't as noticeable in game.

The GTA SA comparison isn't a good one. The PC version of GTA SA was practially a new game since it was completely overhauled to take advantage of the more powerful PC hardware.

In short: No

GF8800 Ultra vs Quadro 4600

Quadro has slower memory and core clocks. Bump them up and you get same performance. Same GPU. Same number of texture units and raster operators.

You can get GeForce 9800 GX2 for smaller price than Quadro 4600.

Geforces are optimized for gaming (directx and your FPSes). Quadros are optimized for CAD (opengl). If same gpu is compared, memory bandwidth, FLOPS and fill rate are similar. Price is 400 USD for Geforce vs 2000-2500 USD for Quadro.

Quadro FX 5600 vs GeForce 8800 GTX

You can do a spec comparison here http://www.gpureview.com/show_cards.php.

Not a real world comparison but it may be useful.

2900 XT vs 8800 Ultra

http://www.gpureview.com/show_cards.php is your friend. Allows you to select any ATI and nVidia card known and compare them side by side. Somebody back about four years ago here on slashdot pointed me in the right direction to that site and have been using it since. :)

A handy database for those shopping for a videocard.

A very handy videocard database for those shopping for a card.

What a redundant waste of table. http://www.gpureview.com/ already has this information and 10 times more.

Good idea, but in reality nothing beats a personal review by someone who tried card X with board Y and memory Z and said "It worked". That's why Toms is best imho. Here is the best all round collection of card data I have found recently, then cross ref this with any reviews you find on Toms closely matching your own hardware base.

If you're confused about what to buy, you should check out this site:

http://www.gpureview.com/database.php

Specifically, the "Compare Cards" feature on the left. I just upgraded my ATI 9600XT to a nVidia 6600GT AGP (because I'm not yet ready to drop a grand on an all new PCIe 64-Bit system), and that site helped me decide what was "enough" of an upgrade for how much money I was willing to spend.