Radeon HD 7950 3GB vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which features a core clock speed of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 256-bit bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 75 Watts (60%)

Memory Bandwidth

The Radeon HD 7950 3GB should in theory perform quite a bit faster than the Radeon R9 M395X overall. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon R9 M395X		160000 MB/sec
	Difference: 80000 (50%)

Texel Rate

The Radeon R9 M395X is a bit (about 3%) better at anisotropic filtering than the Radeon HD 7950 3GB. (explain)

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

Pixel Rate

The Radeon HD 7950 3GB will be a small bit (about 11%) faster with regards to full screen anti-aliasing than the Radeon R9 M395X, and also will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7950 3GB		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 maximum amount of information (in units of megabytes per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.