Radeon R9 280X vs Radeon R9 M295X

Intro

Compare all that to the Radeon R9 M295X, which has core speeds of 750 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 RAM. 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 M295X		125 Watts
Radeon R9 280X		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

In theory, the Radeon R9 280X should be 64% faster than the Radeon R9 M295X in general, due to its greater data rate. (explain)

Radeon R9 280X		288000 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 112000 (64%)

Texel Rate

The Radeon R9 280X is a small bit (approximately 13%) more effective at AF than the Radeon R9 M295X. (explain)

Radeon R9 280X		108800 Mtexels/sec
Radeon R9 M295X		96000 Mtexels/sec
	Difference: 12800 (13%)

Pixel Rate

The Radeon R9 280X will be a bit (about 13%) faster with regards to anti-aliasing than the Radeon R9 M295X, and able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 280X		27200 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 3200 (13%)

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 MB per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If 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, HDR and high resolutions.

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