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GeForce 8800 GT 512MB vs Radeon HD 4850 X2 512MB

Intro

The GeForce 8800 GT 512MB uses a 65 nm design. nVidia has set the core frequency at 600 MHz. The GDDR3 RAM is set to run at a speed of 900 MHz on this specific card. It features 112 SPUs as well as 56 TAUs and 16 Rasterization Operator Units.

Compare that to the Radeon HD 4850 X2 512MB, which has a core clock speed of 625 MHz and a GDDR3 memory speed of 993 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GT 512MB 105 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 145 Watts (138%)

Memory Bandwidth

In theory, the Radeon HD 4850 X2 512MB will be 121% faster than the GeForce 8800 GT 512MB overall, due to its greater data rate. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
GeForce 8800 GT 512MB 57600 MB/sec
Difference: 69504 (121%)

Texel Rate

The Radeon HD 4850 X2 512MB is a lot (more or less 49%) better at anisotropic filtering than the GeForce 8800 GT 512MB. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
GeForce 8800 GT 512MB 33600 Mtexels/sec
Difference: 16400 (49%)

Pixel Rate

The Radeon HD 4850 X2 512MB will be quite a bit (approximately 108%) more effective at AA than the GeForce 8800 GT 512MB, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
GeForce 8800 GT 512MB 9600 Mpixels/sec
Difference: 10400 (108%)

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 512MB

Amazon.com

Check prices at:

Radeon HD 4850 X2 512MB

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 512MB Radeon HD 4850 X2 512MB
Manufacturer nVidia AMD
Year Oct 2007 Nov 7, 2008
Code Name G92 R700
Memory 512 MB 512 MB (x2)
Core Speed 600 MHz 625 MHz (x2)
Memory Speed 1800 MHz 1986 MHz (x2)
Power (Max TDP) 105 watts 250 watts
Bandwidth 57600 MB/sec 127104 MB/sec
Texel Rate 33600 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 112 800(160x5) (x2)
Texture Mapping Units 56 40 (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 956 million
Bus PCIe x16 2.0 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce 8800 GT 512MB

Amazon.com

Check prices at:

Radeon HD 4850 X2 512MB

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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