Radeon R9 M375X vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which makes use of a 28 nm design. AMD has set the core speed at 723 MHz. The GDDR5 RAM is set to run at a speed of 1250 MHz on this card. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 M390X should perform much 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 should be a lot (approximately 128%) more effective at texture filtering 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 (approximately 42%) more effective at AA than the Radeon R9 M375X, and also should be capable of handling higher screen resolutions while still performing well. (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 (in units of megabytes per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total texture units of the card 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka 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 memory bandwidth is, the lower the potential to get to the maximum fill rate.