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GeForce 8800 GT 256MB vs Radeon HD 3850 X2

Intro

The GeForce 8800 GT 256MB has a GPU core clock speed of 600 MHz, and the 256 MB of GDDR3 RAM is set to run at 700 MHz through a 256-bit bus. It also is comprised of 112 Stream Processors, 56 Texture Address Units, and 16 ROPs.

Compare that to the Radeon HD 3850 X2, which features a clock speed of 668 MHz and a GDDR3 memory speed of 828 MHz. It also uses a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 3850 X2 will be 137% faster than the GeForce 8800 GT 256MB in general, due to its greater data rate. (explain)

Radeon HD 3850 X2 105984 MB/sec
GeForce 8800 GT 256MB 44800 MB/sec
Difference: 61184 (137%)

Texel Rate

The GeForce 8800 GT 256MB should be a lot (approximately 57%) more effective at AF than the Radeon HD 3850 X2. (explain)

GeForce 8800 GT 256MB 33600 Mtexels/sec
Radeon HD 3850 X2 21376 Mtexels/sec
Difference: 12224 (57%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 3850 X2 is superior to the GeForce 8800 GT 256MB, by a large margin. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
GeForce 8800 GT 256MB 9600 Mpixels/sec
Difference: 11776 (123%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce 8800 GT 256MB

Amazon.com

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Radeon HD 3850 X2

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce 8800 GT 256MB Radeon HD 3850 X2
Manufacturer nVidia AMD
Year Dec 2007 Apr 4, 2008
Code Name G92 RV670 PRO
Memory 256 MB 512 MB (x2)
Core Speed 600 MHz 668 MHz (x2)
Memory Speed 1400 MHz 1656 MHz (x2)
Power (Max TDP) 105 watts (Unknown) watts
Bandwidth 44800 MB/sec 105984 MB/sec
Texel Rate 33600 Mtexels/sec 21376 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 21376 Mpixels/sec
Unified Shaders 112 320(64x5) (x2)
Texture Mapping Units 56 16 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 65 nm 55 nm
Transistors 754 million (Unknown) million
Bus PCIe x16 2.0 PCIe 2.0 x16/(internal PCIe 1.1 x16)
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce 8800 GT 256MB

Amazon.com

Check prices at:

Radeon HD 3850 X2

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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