GeForce GTX 1080 vs Radeon HD 6990

Intro

Compare those specifications to the Radeon HD 6990, which uses a 40 nm design. AMD has clocked the core frequency at 830 MHz. The GDDR5 RAM is set to run at a frequency of 1250 MHz on this model. It features 1536 SPUs as well as 96 TAUs 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 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

The GeForce GTX 1080 should theoretically perform a bit faster 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 much (about 61%) faster with regards to texture filtering than the Radeon HD 6990. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 1080 is a better choice, by a large margin. (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 max amount of data (in units of MB per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is calculated 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 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 its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes 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 bandwidth is, the lower the potential to reach the max fill rate.