Radeon R9 390X 8G vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which has core clock speeds of 750 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units 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 390X 8G		275 Watts
	Difference: 150 Watts (120%)

Memory Bandwidth

The Radeon R9 390X 8G, in theory, should be quite a bit faster than the Radeon R9 M295X in general. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 208000 (118%)

Texel Rate

The Radeon R9 390X 8G should be quite a bit (more or less 93%) faster with regards to AF than the Radeon R9 M295X. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon R9 M295X		96000 Mtexels/sec
	Difference: 88800 (93%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 390X 8G is superior to the Radeon R9 M295X, by far. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 43200 (180%)

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 max amount of information (in units of MB per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 are applied in one second. This number is calculated by multiplying the total texture units by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can 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 colour ROPs 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 fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.