Radeon R9 280 vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which features clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Radeon R9 280		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

In theory, the Radeon R9 280 is 50% faster than the Radeon R9 M395X in general, due to its higher data rate. (explain)

Radeon R9 280		240000 MB/sec
Radeon R9 M395X		160000 MB/sec
	Difference: 80000 (50%)

Texel Rate

The Radeon R9 280 is a little bit (more or less 13%) more effective at AF than the Radeon R9 M395X. (explain)

Radeon R9 280		104496 Mtexels/sec
Radeon R9 M395X		92544 Mtexels/sec
	Difference: 11952 (13%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 280 is the winner, and very much so. (explain)

Radeon R9 280		29856 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 6720 (29%)

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 past the external memory interface in one second. The number is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the video 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 colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.