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GeForce 9800 GX2 vs Radeon HD 7770

Intro

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

Compare all of that to the Radeon HD 7770, which uses a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM is set to run at a speed of 1125 MHz on this model. It features 640 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 7770 80 Watts
GeForce 9800 GX2 197 Watts
Difference: 117 Watts (146%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 is 78% faster than the Radeon HD 7770 in general, due to its higher bandwidth. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 56000 (78%)

Texel Rate

The GeForce 9800 GX2 is quite a bit (more or less 92%) better at anisotropic filtering than the Radeon HD 7770. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 7770 40000 Mtexels/sec
Difference: 36800 (92%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce 9800 GX2 is a better choice, not by a very large margin though. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 3200 (20%)

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 7770

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 7770
Manufacturer nVidia AMD
Year Mar 2008 February 2012
Code Name G92 Cape Verde XT
Memory 512 MB (x2) 1024 MB
Core Speed 600 MHz (x2) 1000 MHz
Memory Speed 2000 MHz (x2) 4500 MHz
Power (Max TDP) 197 watts 80 watts
Bandwidth 128000 MB/sec 72000 MB/sec
Texel Rate 76800 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 128 (x2) 640
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 28 nm
Transistors 754 million 1500 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number 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 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 most pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce 9800 GX2

Amazon.com

Check prices at:

Radeon HD 7770

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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