GeForce GTX 580 vs Radeon HD 6990

Intro

Compare those specs to the Radeon HD 6990, which has core speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 96 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6990		5820 points
GeForce GTX 580		4956 points
	Difference: 864 (17%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 580		244 Watts
Radeon HD 6990		375 Watts
	Difference: 131 Watts (54%)

Memory Bandwidth

In theory, the Radeon HD 6990 should be a lot faster than the GeForce GTX 580 in general. (explain)

Radeon HD 6990		320000 MB/sec
GeForce GTX 580		192384 MB/sec
	Difference: 127616 (66%)

Texel Rate

The Radeon HD 6990 should be quite a bit (more or less 223%) better at AF than the GeForce GTX 580. (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce GTX 580		49408 Mtexels/sec
	Difference: 109952 (223%)

Pixel Rate

The Radeon HD 6990 will be much (approximately 43%) better at anti-aliasing than the GeForce GTX 580, and will be able to handle higher resolutions more effectively. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce GTX 580		37056 Mpixels/sec
	Difference: 16064 (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

Specifications

Memory Bandwidth: Bandwidth is the largest amount of data (measured in MB per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 amount of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 amount of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.