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Radeon HD 7970 vs Radeon HD 7990

Intro

The Radeon HD 7970 has core clock speeds of 925 MHz on the GPU, and 1375 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Compare all of that to the Radeon HD 7990, which comes with clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

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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 speaking, the Radeon HD 7990 should perform much 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 is quite a bit (about 105%) more effective at AF 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 much (more or less 105%) faster with regards to FSAA than the Radeon HD 7970, and able to handle higher resolutions more effectively. (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

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Radeon HD 7970

Amazon.com

Check prices at:

Radeon HD 7990

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 7970 Radeon HD 7990
Manufacturer AMD AMD
Year January 2012 April 2013
Code Name Tahiti XT Malta
Memory 3072 MB 3072 MB (x2)
Core Speed 925 MHz 950 MHz (x2)
Memory Speed 5500 MHz 6000 MHz (x2)
Power (Max TDP) 250 watts 375 watts
Bandwidth 264000 MB/sec 576000 MB/sec
Texel Rate 118400 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 2048 2048 (x2)
Texture Mapping Units 128 128 (x2)
Render Output Units 32 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 384-bit 384-bit (x2)
Fab Process 28 nm 28 nm
Transistors 4313 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 7970

Amazon.com

Check prices at:

Radeon HD 7990

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Comments

2 Responses to “Radeon HD 7970 vs Radeon HD 7990”
john says:

if you havea ny of these cards get evga precision, push the voltage to the highest and notice the 20+fps difference (bf3)

fred says:

i am getting the 7970 and my friend is getting the 7990, the 7990 is double the 7970 but is also double the price. both cards look very good it just depends on your budget.

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