Geforce GTX 770 vs Radeon HD 6990

Intro

Compare those specifications to the Radeon HD 6990, which comes with core clock speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 96 TAUs 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 770		7854 points
Radeon HD 6990		5820 points
	Difference: 2034 (35%)

Ethereum Mining Hash Rate

Radeon HD 6990		24 Mh/s
Geforce GTX 770		14 Mh/s
	Difference: 10 (71%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 770		230 Watts
Radeon HD 6990		375 Watts
	Difference: 145 Watts (63%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 should perform a lot faster than the Geforce GTX 770 overall. (explain)

Radeon HD 6990		320000 MB/sec
Geforce GTX 770		224384 MB/sec
	Difference: 95616 (43%)

Texel Rate

The Radeon HD 6990 is a small bit (about 19%) better at anisotropic filtering than the Geforce GTX 770. (explain)

Radeon HD 6990		159360 Mtexels/sec
Geforce GTX 770		133888 Mtexels/sec
	Difference: 25472 (19%)

Pixel Rate

The Radeon HD 6990 should be much (about 59%) more effective at full screen anti-aliasing than the Geforce GTX 770, and should be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 6990		53120 Mpixels/sec
Geforce GTX 770		33472 Mpixels/sec
	Difference: 19648 (59%)

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 maximum amount of data (in units of MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 number of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.