Geforce GTX 780 vs Radeon HD 6990

Intro

Compare all of that to the Radeon HD 6990, which uses a 40 nm design. AMD has clocked the core frequency at 830 MHz. The GDDR5 memory is set to run at a frequency of 1250 MHz on this particular card. 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 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

The Radeon HD 6990 should in theory perform just a bit faster than the Geforce GTX 780 overall. (explain)

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

Texel Rate

The Geforce GTX 780 will be a little bit (approximately 4%) more effective at AF than the Radeon HD 6990. (explain)

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6990 is the winner, by a large margin. (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: Bandwidth is the max amount of data (measured in MB per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher 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 texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.