Radeon HD 7950 vs Radeon HD 7990

Intro

Compare those specifications to the Radeon HD 7990, which features clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs as well as 128 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 7990		15520 points
Radeon HD 7950		7731 points
	Difference: 7789 (101%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon HD 7950		235 Sol/s
	Difference: 278 (118%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon HD 7950		21 Mh/s
	Difference: 11 (52%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950		200 Watts
Radeon HD 7990		375 Watts
	Difference: 175 Watts (88%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7990 should in theory be much better than the Radeon HD 7950 overall. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 7950		240000 MB/sec
	Difference: 336000 (140%)

Texel Rate

The Radeon HD 7990 will be quite a bit (approximately 171%) more effective at texture filtering than the Radeon HD 7950. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 7950		89600 Mtexels/sec
	Difference: 153600 (171%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7990 is superior to the Radeon HD 7950, by far. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 7950		25600 Mpixels/sec
	Difference: 35200 (138%)

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 data (counted in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, the result 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 AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units by the core 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount 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 lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.