Radeon HD 7950 vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which uses a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 RAM is set to run at a frequency of 1250 MHz on this specific card. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Performance-wise, the Radeon HD 7950 should in theory be a lot better than the Radeon R9 M390X overall. (explain)

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

Texel Rate

The Radeon R9 M390X will be a bit (approximately 3%) better at AF than the Radeon HD 7950. (explain)

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

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7950 is the winner, but not by far. (explain)

Radeon HD 7950		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

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total number of texture units by the core clock 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 one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. 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 lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.