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Radeon HD 7950 3GB vs Radeon HD 7990

Intro

The Radeon HD 7950 3GB makes use of a 28 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM runs at a speed of 1250 MHz on this card. It features 1792 SPUs as well as 112 Texture Address Units and 32 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7990, which comes with a clock frequency of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 384-bit bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

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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.

Zcash Mining Hash Rate

Radeon HD 7990 513 Sol/s
Radeon HD 7950 3GB 229 Sol/s
Difference: 284 (124%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 3GB 200 Watts
Radeon HD 7990 375 Watts
Difference: 175 Watts (88%)

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should in theory be quite a bit better than the Radeon HD 7950 3GB overall. (explain)

Radeon HD 7990 576000 MB/sec
Radeon HD 7950 3GB 240000 MB/sec
Difference: 336000 (140%)

Texel Rate

The Radeon HD 7990 should be a lot (approximately 171%) faster with regards to AF than the Radeon HD 7950 3GB. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon HD 7950 3GB 89600 Mtexels/sec
Difference: 153600 (171%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7990 is superior to the Radeon HD 7950 3GB, and very much so. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon HD 7950 3GB 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

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Radeon HD 7950 3GB

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 7950 3GB Radeon HD 7990
Manufacturer AMD AMD
Year January 2012 April 2013
Code Name Tahiti Pro Malta
Memory 3072 MB 3072 MB (x2)
Core Speed 800 MHz 950 MHz (x2)
Memory Speed 5000 MHz 6000 MHz (x2)
Power (Max TDP) 200 watts 375 watts
Bandwidth 240000 MB/sec 576000 MB/sec
Texel Rate 89600 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 1792 2048 (x2)
Texture Mapping Units 112 128 (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: Bandwidth is the largest amount of information (in units of MB per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 7950 3GB

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.

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