Radeon R9 M375X vs Radeon R9 M390X

Intro

Compare all that to the Radeon R9 M390X, which has a clock frequency of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 M390X should in theory be quite a bit faster than the Radeon R9 M375X overall. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon R9 M375X		72000 MB/sec
	Difference: 88000 (122%)

Texel Rate

The Radeon R9 M390X is quite a bit (more or less 128%) more effective at AF than the Radeon R9 M375X. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon R9 M375X		40600 Mtexels/sec
	Difference: 51944 (128%)

Pixel Rate

The Radeon R9 M390X is a lot (more or less 42%) better at full screen anti-aliasing than the Radeon R9 M375X, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon R9 M375X		16240 Mpixels/sec
	Difference: 6896 (42%)

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 (counted in megabytes per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, 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 anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. 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 is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.