Radeon R9 M295X vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which comes with clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. 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

Both cards have the same power consumption.

Memory Bandwidth

Performance-wise, the Radeon R9 M295X should in theory be a little bit better than the Radeon R9 M390X in general. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 16000 (10%)

Texel Rate

The Radeon R9 M295X will be a little bit (approximately 4%) more effective at anisotropic filtering than the Radeon R9 M390X. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 3456 (4%)

Pixel Rate

The Radeon R9 M295X should be a small bit (approximately 4%) better at AA than the Radeon R9 M390X, and also able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 864 (4%)

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 max amount of information (measured in megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.