GeForce GTX 580 vs Radeon HD 7990

Intro

Compare those specs to the Radeon HD 7990, which features core speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

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 7990		15520 points
GeForce GTX 580		4956 points
	Difference: 10564 (213%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 580		244 Watts
Radeon HD 7990		375 Watts
	Difference: 131 Watts (54%)

Memory Bandwidth

The Radeon HD 7990 should theoretically perform much faster than the GeForce GTX 580 in general. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GTX 580		192384 MB/sec
	Difference: 383616 (199%)

Texel Rate

The Radeon HD 7990 should be a lot (more or less 392%) faster with regards to anisotropic filtering than the GeForce GTX 580. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GTX 580		49408 Mtexels/sec
	Difference: 193792 (392%)

Pixel Rate

The Radeon HD 7990 should be quite a bit (approximately 64%) faster with regards to AA than the GeForce GTX 580, and also will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GTX 580		37056 Mpixels/sec
	Difference: 23744 (64%)

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: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.