Geforce GTX 680 vs Radeon HD 6990

Intro

Compare those specifications to the Radeon HD 6990, which comes with core speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 RAM. 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

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

The Radeon HD 6990, in theory, should perform 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 will be a lot (more or less 24%) faster with regards to AF 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 is quite a bit (approximately 65%) more effective at full screen anti-aliasing than the Geforce GTX 680, and should be capable of handling higher resolutions better. (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: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better 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 texture map elements (texels) that can be processed per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.