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Radeon HD 7950 3GB vs Radeon R9 M390X

Intro

The Radeon HD 7950 3GB has a core clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 384-bit memory bus, and uses a 28 nm design. It is made up of 1792 SPUs, 112 TAUs, and 32 Raster Operation Units.

Compare those specs to the Radeon R9 M390X, which has a clock speed of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 256-bit memory 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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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X 125 Watts
Radeon HD 7950 3GB 200 Watts
Difference: 75 Watts (60%)

Memory Bandwidth

Theoretically, the Radeon HD 7950 3GB should perform a lot faster than the Radeon R9 M390X overall. (explain)

Radeon HD 7950 3GB 240000 MB/sec
Radeon R9 M390X 160000 MB/sec
Difference: 80000 (50%)

Texel Rate

The Radeon R9 M390X is a little bit (more or less 3%) better at AF than the Radeon HD 7950 3GB. (explain)

Radeon R9 M390X 92544 Mtexels/sec
Radeon HD 7950 3GB 89600 Mtexels/sec
Difference: 2944 (3%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7950 3GB is the winner, but only just. (explain)

Radeon HD 7950 3GB 25600 Mpixels/sec
Radeon R9 M390X 23136 Mpixels/sec
Difference: 2464 (11%)

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

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Radeon R9 M390X

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 M390X
Manufacturer AMD AMD
Year January 2012 2015
Code Name Tahiti Pro Tonga
Memory 3072 MB 4096 MB
Core Speed 800 MHz 723 MHz
Memory Speed 5000 MHz 5000 MHz
Power (Max TDP) 200 watts 125 watts
Bandwidth 240000 MB/sec 160000 MB/sec
Texel Rate 89600 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 23136 Mpixels/sec
Unified Shaders 1792 2048
Texture Mapping Units 112 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 4313 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video 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 ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 7950 3GB

Amazon.com

Check prices at:

Radeon R9 M390X

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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