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GeForce 9800 GX2 vs Radeon HD 6770 1GB

Intro

The GeForce 9800 GX2 uses a 65 nm design. nVidia has clocked the core frequency at 600 MHz. The GDDR3 memory works at a speed of 1000 MHz on this specific model. It features 128 SPUs along with 64 Texture Address Units and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 6770 1GB, which comes with core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs along with 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB 108 Watts
GeForce 9800 GX2 197 Watts
Difference: 89 Watts (82%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 is 90% faster than the Radeon HD 6770 1GB in general, due to its greater bandwidth. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 6770 1GB 67200 MB/sec
Difference: 60800 (90%)

Texel Rate

The GeForce 9800 GX2 will be a lot (about 113%) more effective at texture filtering than the Radeon HD 6770 1GB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 6770 1GB 36000 Mtexels/sec
Difference: 40800 (113%)

Pixel Rate

The GeForce 9800 GX2 will be quite a bit (more or less 33%) more effective at AA than the Radeon HD 6770 1GB, and able to handle higher resolutions without losing too much performance. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 6770 1GB 14400 Mpixels/sec
Difference: 4800 (33%)

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 6770 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 6770 1GB
Manufacturer nVidia AMD
Year Mar 2008 January 2011
Code Name G92 Juniper XT
Memory 512 MB (x2) 1024 MB
Core Speed 600 MHz (x2) 900 MHz
Memory Speed 2000 MHz (x2) 4200 MHz
Power (Max TDP) 197 watts 108 watts
Bandwidth 128000 MB/sec 67200 MB/sec
Texel Rate 76800 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 14400 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) 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: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. 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 number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce 9800 GX2

Amazon.com

Check prices at:

Radeon HD 6770 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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