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GeForce 8800 GT 512MB vs GeForce 9800 GX2

Intro

The GeForce 8800 GT 512MB features a core clock speed of 600 MHz and a GDDR3 memory frequency of 900 MHz. It also uses a 256-bit memory bus, and makes use of a 65 nm design. It is comprised of 112 SPUs, 56 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the GeForce 9800 GX2, which makes use of a 65 nm design. nVidia has set the core frequency at 600 MHz. The GDDR3 RAM runs at a speed of 1000 MHz on this card. It features 128 SPUs as well as 64 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GT 512MB 105 Watts
GeForce 9800 GX2 197 Watts
Difference: 92 Watts (88%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 should be 122% faster than the GeForce 8800 GT 512MB overall, due to its greater bandwidth. (explain)

GeForce 9800 GX2 128000 MB/sec
GeForce 8800 GT 512MB 57600 MB/sec
Difference: 70400 (122%)

Texel Rate

The GeForce 9800 GX2 should be quite a bit (approximately 129%) faster with regards to texture filtering than the GeForce 8800 GT 512MB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
GeForce 8800 GT 512MB 33600 Mtexels/sec
Difference: 43200 (129%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce 9800 GX2 is a better choice, by far. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
GeForce 8800 GT 512MB 9600 Mpixels/sec
Difference: 9600 (100%)

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:

GeForce 9800 GX2

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 GeForce 9800 GX2
Manufacturer nVidia nVidia
Year Oct 2007 Mar 2008
Code Name G92 G92
Memory 512 MB 512 MB (x2)
Core Speed 600 MHz 600 MHz (x2)
Memory Speed 1800 MHz 2000 MHz (x2)
Power (Max TDP) 105 watts 197 watts
Bandwidth 57600 MB/sec 128000 MB/sec
Texel Rate 33600 Mtexels/sec 76800 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 19200 Mpixels/sec
Unified Shaders 112 128 (x2)
Texture Mapping Units 56 64 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 65 nm 65 nm
Transistors 754 million 754 million
Bus PCIe x16 2.0 PCIe x16 2.0
DirectX Version DirectX 10 DirectX 10
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. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce 8800 GT 512MB

Amazon.com

Check prices at:

GeForce 9800 GX2

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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