GeForce GTX 1080 vs Radeon HD 6990

Intro

Compare those specs to the Radeon HD 6990, which comes with 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 1080		21942 points
Radeon HD 6990		5820 points
	Difference: 16122 (277%)

Ethereum Mining Hash Rate

Radeon HD 6990		24 Mh/s
GeForce GTX 1080		20 Mh/s
	Difference: 4 (20%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 1080		180 Watts
Radeon HD 6990		375 Watts
	Difference: 195 Watts (108%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 1080 should theoretically be a bit better than the Radeon HD 6990 overall. (explain)

GeForce GTX 1080		327680 MB/sec
Radeon HD 6990		320000 MB/sec
	Difference: 7680 (2%)

Texel Rate

The GeForce GTX 1080 should be a lot (more or less 61%) faster with regards to AF than the Radeon HD 6990. (explain)

GeForce GTX 1080		257120 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 97760 (61%)

Pixel Rate

The GeForce GTX 1080 will be quite a bit (about 94%) faster with regards to anti-aliasing than the Radeon HD 6990, and should be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 1080		102848 Mpixels/sec
Radeon HD 6990		53120 Mpixels/sec
	Difference: 49728 (94%)

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 data (in units of MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR RAM, it should 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, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can 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 - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.