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GeForce 9800 GX2 vs Radeon HD 6750 1GB

Intro

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

Compare those specifications to the Radeon HD 6750 1GB, which uses a 40 nm design. AMD has clocked the core frequency at 725 MHz. The GDDR5 memory runs at a frequency of 1000 MHz on this specific model. It features 720 SPUs as well as 36 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB 86 Watts
GeForce 9800 GX2 197 Watts
Difference: 111 Watts (129%)

Memory Bandwidth

Performance-wise, the GeForce 9800 GX2 should theoretically be much superior to the Radeon HD 6750 1GB overall. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 6750 1GB 64000 MB/sec
Difference: 64000 (100%)

Texel Rate

The GeForce 9800 GX2 is a lot (about 194%) more effective at texture filtering than the Radeon HD 6750 1GB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 6750 1GB 26100 Mtexels/sec
Difference: 50700 (194%)

Pixel Rate

The GeForce 9800 GX2 is a lot (about 66%) faster with regards to FSAA than the Radeon HD 6750 1GB, and also able to handle higher resolutions while still performing well. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 6750 1GB 11600 Mpixels/sec
Difference: 7600 (66%)

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 6750 1GB

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 6750 1GB
Manufacturer nVidia AMD
Year Mar 2008 January 2011
Code Name G92 Juniper Pro
Memory 512 MB (x2) 1024 MB
Core Speed 600 MHz (x2) 725 MHz
Memory Speed 2000 MHz (x2) 4000 MHz
Power (Max TDP) 197 watts 86 watts
Bandwidth 128000 MB/sec 64000 MB/sec
Texel Rate 76800 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 128 (x2) 720
Texture Mapping Units 64 (x2) 36
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 65 nm 40 nm
Transistors 754 million 1040 million
Bus PCIe x16 2.0 PCIe x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of data (in units of MB per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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

Display Prices

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GeForce 9800 GX2

Amazon.com

Check prices at:

Radeon HD 6750 1GB

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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