Radeon HD 6990 vs Radeon HD 7950

Intro

Compare those specs to the Radeon HD 7950, which features a clock speed of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 384-bit memory bus, and uses a 28 nm design. It is comprised of 1792 SPUs, 112 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

Radeon HD 7950		7731 points
Radeon HD 6990		5820 points
	Difference: 1911 (33%)

Ethereum Mining Hash Rate

Radeon HD 6990		24 Mh/s
Radeon HD 7950		21 Mh/s
	Difference: 3 (14%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950		200 Watts
Radeon HD 6990		375 Watts
	Difference: 175 Watts (88%)

Memory Bandwidth

In theory, the Radeon HD 6990 should perform much faster than the Radeon HD 7950 overall. (explain)

Radeon HD 6990		320000 MB/sec
Radeon HD 7950		240000 MB/sec
	Difference: 80000 (33%)

Texel Rate

The Radeon HD 6990 should be much (approximately 78%) faster with regards to AF than the Radeon HD 7950. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon HD 7950		89600 Mtexels/sec
	Difference: 69760 (78%)

Pixel Rate

The Radeon HD 6990 should be much (more or less 108%) more effective at anti-aliasing than the Radeon HD 7950, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon HD 7950		25600 Mpixels/sec
	Difference: 27520 (108%)

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 information (measured in megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses 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 high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.