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Radeon HD 7950 3GB vs Radeon R9 390 8G

Intro

The Radeon HD 7950 3GB comes with a GPU clock speed of 800 MHz, and the 3072 MB of GDDR5 RAM runs at 1250 MHz through a 384-bit bus. It also features 1792 SPUs, 112 TAUs, and 32 Raster Operation Units.

Compare that to the Radeon R9 390 8G, which makes use of a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM is set to run at a speed of 1500 MHz on this particular model. It features 2560 SPUs as well as 160 TAUs and 64 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 R9 390 8G 326 Sol/s
Radeon HD 7950 3GB 229 Sol/s
Difference: 97 (42%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 3GB 200 Watts
Radeon R9 390 8G 275 Watts
Difference: 75 Watts (38%)

Memory Bandwidth

Theoretically, the Radeon R9 390 8G should perform much faster than the Radeon HD 7950 3GB overall. (explain)

Radeon R9 390 8G 384000 MB/sec
Radeon HD 7950 3GB 240000 MB/sec
Difference: 144000 (60%)

Texel Rate

The Radeon R9 390 8G is a lot (about 79%) better at texture filtering than the Radeon HD 7950 3GB. (explain)

Radeon R9 390 8G 160000 Mtexels/sec
Radeon HD 7950 3GB 89600 Mtexels/sec
Difference: 70400 (79%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 390 8G is a better choice, by a large margin. (explain)

Radeon R9 390 8G 64000 Mpixels/sec
Radeon HD 7950 3GB 25600 Mpixels/sec
Difference: 38400 (150%)

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.

Price Comparison

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Radeon HD 7950 3GB

Amazon.com

Check prices at:

Radeon R9 390 8G

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 R9 390 8G
Manufacturer AMD AMD
Year January 2012 June 2015
Code Name Tahiti Pro Grenada PRO
Memory 3072 MB 8192 MB
Core Speed 800 MHz 1000 MHz
Memory Speed 5000 MHz 6000 MHz
Power (Max TDP) 200 watts 275 watts
Bandwidth 240000 MB/sec 384000 MB/sec
Texel Rate 89600 Mtexels/sec 160000 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 64000 Mpixels/sec
Unified Shaders 1792 2560
Texture Mapping Units 112 160
Render Output Units 32 64
Bus Type GDDR5 GDDR5
Bus Width 384-bit 512-bit
Fab Process 28 nm 28 nm
Transistors 4313 million 6200 million
Bus PCIe 3.0 x16 PCIe 3.0 ×16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.2 OpenGL 4.5

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher 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 one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. 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 quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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Radeon HD 7950 3GB

Amazon.com

Check prices at:

Radeon R9 390 8G

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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