Radeon HD 7970 vs Radeon HD 7990

Intro

Compare those specs to the Radeon HD 7990, which has core speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs along with 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 7970		8225 points
	Difference: 7295 (89%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon HD 7970		21 Mh/s
	Difference: 11 (52%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7970		250 Watts
Radeon HD 7990		375 Watts
	Difference: 125 Watts (50%)

Memory Bandwidth

Theoretically, the Radeon HD 7990 should be quite a bit faster than the Radeon HD 7970 overall. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 7970		264000 MB/sec
	Difference: 312000 (118%)

Texel Rate

The Radeon HD 7990 will be much (approximately 105%) more effective at anisotropic filtering than the Radeon HD 7970. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 7970		118400 Mtexels/sec
	Difference: 124800 (105%)

Pixel Rate

The Radeon HD 7990 should be a lot (approximately 105%) more effective at full screen anti-aliasing than the Radeon HD 7970, and also should be able to handle higher resolutions better. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 7970		29600 Mpixels/sec
	Difference: 31200 (105%)

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 (counted in MB per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 are processed per second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock 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 lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.