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GeForce 9800 GX2 vs Radeon HD 6790

Intro

The GeForce 9800 GX2 has a clock frequency of 600 MHz and a GDDR3 memory speed of 1000 MHz. It also features a 256-bit memory bus, and makes use of a 65 nm design. It is made up of 128 SPUs, 64 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 6790, which comes with core clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs as well as 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
GeForce 9800 GX2 197 Watts
Difference: 47 Watts (31%)

Memory Bandwidth

Theoretically, the Radeon HD 6790 should perform a little bit faster than the GeForce 9800 GX2 in general. (explain)

Radeon HD 6790 134400 MB/sec
GeForce 9800 GX2 128000 MB/sec
Difference: 6400 (5%)

Texel Rate

The GeForce 9800 GX2 is much (approximately 129%) more effective at texture filtering than the Radeon HD 6790. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 43200 (129%)

Pixel Rate

The GeForce 9800 GX2 will be quite a bit (approximately 43%) faster with regards to FSAA than the Radeon HD 6790, and also able to handle higher resolutions more effectively. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 5760 (43%)

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 9800 GX2

Amazon.com

Check prices at:

Radeon HD 6790

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 9800 GX2 Radeon HD 6790
Manufacturer nVidia AMD
Year Mar 2008 April 2011
Code Name G92 Barts LE
Memory 512 MB (x2) 1024 MB
Core Speed 600 MHz (x2) 840 MHz
Memory Speed 2000 MHz (x2) 4200 MHz
Power (Max TDP) 197 watts 150 watts
Bandwidth 128000 MB/sec 134400 MB/sec
Texel Rate 76800 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 128 (x2) 800
Texture Mapping Units 64 (x2) 40
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 65 nm 40 nm
Transistors 754 million 1700 million
Bus PCIe x16 2.0 PCIe 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics 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 number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

GeForce 9800 GX2

Amazon.com

Check prices at:

Radeon HD 6790

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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