Geforce GTX 680 vs Radeon HD 6990

Intro

Compare those specifications to the Radeon HD 6990, which has core speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 96 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

Geforce GTX 680		7650 points
Radeon HD 6990		5820 points
	Difference: 1830 (31%)

Ethereum Mining Hash Rate

Radeon HD 6990		24 Mh/s
Geforce GTX 680		16 Mh/s
	Difference: 8 (50%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 680		195 Watts
Radeon HD 6990		375 Watts
	Difference: 180 Watts (92%)

Memory Bandwidth

Theoretically, the Radeon HD 6990 should be a lot faster than the Geforce GTX 680 in general. (explain)

Radeon HD 6990		320000 MB/sec
Geforce GTX 680		192256 MB/sec
	Difference: 127744 (66%)

Texel Rate

The Radeon HD 6990 should be quite a bit (about 24%) faster with regards to texture filtering than the Geforce GTX 680. (explain)

Radeon HD 6990		159360 Mtexels/sec
Geforce GTX 680		128768 Mtexels/sec
	Difference: 30592 (24%)

Pixel Rate

The Radeon HD 6990 should be a lot (approximately 65%) faster with regards to anti-aliasing than the Geforce GTX 680, and also able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 6990		53120 Mpixels/sec
Geforce GTX 680		32192 Mpixels/sec
	Difference: 20928 (65%)

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 largest amount of information (in units of megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.