Radeon R9 285 vs Radeon R9 M395X

Intro

Compare that to the Radeon R9 M395X, which uses a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 memory works at a frequency of 1250 MHz on this particular card. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Radeon R9 285		190 Watts
	Difference: 65 Watts (52%)

Memory Bandwidth

In theory, the Radeon R9 285 is 10% faster than the Radeon R9 M395X overall, because of its higher data rate. (explain)

Radeon R9 285		176000 MB/sec
Radeon R9 M395X		160000 MB/sec
	Difference: 16000 (10%)

Texel Rate

The Radeon R9 285 is a bit (more or less 11%) more effective at texture filtering than the Radeon R9 M395X. (explain)

Radeon R9 285		102816 Mtexels/sec
Radeon R9 M395X		92544 Mtexels/sec
	Difference: 10272 (11%)

Pixel Rate

The Radeon R9 285 will be much (about 27%) faster with regards to FSAA than the Radeon R9 M395X, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 285		29376 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 6240 (27%)

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 largest amount of data (in units of MB per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total amount 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.