Radeon R9 390 8G vs Radeon R9 M295X

Intro

Compare that to the Radeon R9 M295X, which makes use of a 28 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 RAM is set to run at a speed of 1375 MHz on this model. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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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

Performance-wise, the Radeon R9 390 8G should theoretically be quite a bit 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 is a lot (more or less 67%) better at anisotropic 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 quite a bit (approximately 167%) better at FSAA than the Radeon R9 M295X, and capable of handling higher resolutions while still performing well. (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 information (in units of megabytes per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card 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 ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.