Geforce GTX 780 vs Radeon HD 6990

Intro

Compare all of that to the Radeon HD 6990, which features core speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. 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 780		10082 points
Radeon HD 6990		5820 points
	Difference: 4262 (73%)

Ethereum Mining Hash Rate

Radeon HD 6990		24 Mh/s
Geforce GTX 780		20 Mh/s
	Difference: 4 (20%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 780		250 Watts
Radeon HD 6990		375 Watts
	Difference: 125 Watts (50%)

Memory Bandwidth

In theory, the Radeon HD 6990 will be 11% quicker than the Geforce GTX 780 in general, because of its greater bandwidth. (explain)

Radeon HD 6990		320000 MB/sec
Geforce GTX 780		288384 MB/sec
	Difference: 31616 (11%)

Texel Rate

The Geforce GTX 780 will be just a bit (about 4%) better at texture filtering than the Radeon HD 6990. (explain)

Geforce GTX 780		165696 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 6336 (4%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6990 is superior to the Geforce GTX 780, by far. (explain)

Radeon HD 6990		53120 Mpixels/sec
Geforce GTX 780		41424 Mpixels/sec
	Difference: 11696 (28%)

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 moved across the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the card's clock speed. 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 also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.