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Radeon HD 7950 3GB vs Radeon R9 390 8G

Intro

The Radeon HD 7950 3GB comes with a core clock frequency of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 384-bit memory bus, and makes use of a 28 nm design. It features 1792 SPUs, 112 Texture Address Units, and 32 ROPs.

Compare those specs to the Radeon R9 390 8G, which comes with core clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2560 SPUs along with 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 be much faster than the Radeon HD 7950 3GB in general. (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 should be much (more or less 79%) more effective at AF 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 screen resolution is important to you, then the Radeon R9 390 8G is superior to the Radeon HD 7950 3GB, by far. (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 across the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

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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