GeForce GTX 1080 vs Radeon HD 6990

Intro

Compare those specs to the Radeon HD 6990, which features GPU clock speed of 830 MHz, and 2048 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also is made up of 1536 Stream Processors, 96 TAUs, and 32 Raster Operation 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

Theoretically speaking, the GeForce GTX 1080 should be 2% quicker than the Radeon HD 6990 in general, due to its higher data rate. (explain)

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

Texel Rate

The GeForce GTX 1080 should be much (about 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 should be quite a bit (about 94%) faster with regards to full screen anti-aliasing than the Radeon HD 6990, and also capable of handling higher resolutions more effectively. (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: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.