Radeon HD 7950 vs Radeon R9 M395X

Intro

Compare those specs to the Radeon R9 M395X, which has GPU clock speed of 723 MHz, and 4096 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Radeon HD 7950		200 Watts
	Difference: 75 Watts (60%)

Memory Bandwidth

In theory, the Radeon HD 7950 should perform a lot faster than the Radeon R9 M395X in general. (explain)

Radeon HD 7950		240000 MB/sec
Radeon R9 M395X		160000 MB/sec
	Difference: 80000 (50%)

Texel Rate

The Radeon R9 M395X will be a small bit (about 3%) faster with regards to texture filtering than the Radeon HD 7950. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 7950		89600 Mtexels/sec
	Difference: 2944 (3%)

Pixel Rate

The Radeon HD 7950 is a small bit (more or less 11%) faster with regards to AA than the Radeon R9 M395X, and will be able to handle higher resolutions better. (explain)

Radeon HD 7950		25600 Mpixels/sec
Radeon R9 M395X		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: Memory bandwidth is the max 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 the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the 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 can be applied per second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

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