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GeForce 9800 GX2 vs Radeon HD 5770

Intro

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

Compare those specs to the Radeon HD 5770, which features a clock frequency of 850 MHz and a GDDR5 memory speed of 1200 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770 108 Watts
GeForce 9800 GX2 197 Watts
Difference: 89 Watts (82%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 is 67% faster than the Radeon HD 5770 overall, due to its higher data rate. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 5770 76800 MB/sec
Difference: 51200 (67%)

Texel Rate

The GeForce 9800 GX2 will be quite a bit (more or less 126%) better at anisotropic filtering than the Radeon HD 5770. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 5770 34000 Mtexels/sec
Difference: 42800 (126%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce 9800 GX2 is a better choice, by a large margin. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 5770 13600 Mpixels/sec
Difference: 5600 (41%)

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 5770

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 5770
Manufacturer nVidia AMD
Year Mar 2008 October 13, 2009
Code Name G92 Juniper XT
Memory 512 MB (x2) 1024 MB
Core Speed 600 MHz (x2) 850 MHz
Memory Speed 2000 MHz (x2) 4800 MHz
Power (Max TDP) 197 watts 108 watts
Bandwidth 128000 MB/sec 76800 MB/sec
Texel Rate 76800 Mtexels/sec 34000 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 13600 Mpixels/sec
Unified Shaders 128 (x2) 800(160x5)
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 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total number of texture units 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its 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 the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory 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 5770

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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