Radeon HD 7950 vs Radeon HD 7990

Intro

Compare that to the Radeon HD 7990, which has a GPU core clock speed of 950 MHz, and 3072 MB of GDDR5 RAM running at 1500 MHz through a 384-bit bus. It also features 2048 Stream Processors, 128 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

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

Theoretically speaking, the Radeon HD 7990 should be 140% quicker than the Radeon HD 7950 overall, due to its greater data rate. (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%) better at anisotropic filtering than the Radeon HD 7950. (explain)

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

Pixel Rate

The Radeon HD 7990 is much (approximately 138%) more effective at full screen anti-aliasing than the Radeon HD 7950, and should be capable of handling higher screen resolutions without losing too much performance. (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 largest amount of information (in units of megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines 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 many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.