Radeon R9 390 8G vs Radeon R9 M295X

Intro

Compare all that to the Radeon R9 M295X, which uses a 28 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 RAM runs at a speed of 1375 MHz on this specific model. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Radeon R9 390 8G		275 Watts
	Difference: 150 Watts (120%)

Memory Bandwidth

As far as performance goes, the Radeon R9 390 8G should theoretically be much superior to the Radeon R9 M295X in general. (explain)

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

Texel Rate

The Radeon R9 390 8G will be much (approximately 67%) better at texture filtering than the Radeon R9 M295X. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R9 M295X		96000 Mtexels/sec
	Difference: 64000 (67%)

Pixel Rate

The Radeon R9 390 8G should be much (more or less 167%) better at AA than the Radeon R9 M295X, and also will be able to handle higher resolutions better. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 40000 (167%)

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 data (counted in megabytes per second) that can be moved past the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. 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 many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.