Radeon HD 7950 3GB vs Radeon R9 M385X

Intro

Compare that to the Radeon R9 M385X, which features a GPU core clock speed of 1100 MHz, and 4096 MB of GDDR5 RAM set to run at 1500 MHz through a 128-bit bus. It also features 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 7950 3GB is 150% quicker than the Radeon R9 M385X in general, because of its greater bandwidth. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 144000 (150%)

Texel Rate

The Radeon HD 7950 3GB will be a lot (approximately 45%) more effective at anisotropic filtering than the Radeon R9 M385X. (explain)

Radeon HD 7950 3GB		89600 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 28000 (45%)

Pixel Rate

The Radeon HD 7950 3GB will be quite a bit (more or less 45%) more effective at FSAA than the Radeon R9 M385X, and also capable of handling higher screen resolutions better. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 8000 (45%)

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 information (measured in megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at 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 that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.