Radeon R9 390X 8G vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which has core clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. 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 M390X		125 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 150 Watts (120%)

Memory Bandwidth

Theoretically, the Radeon R9 390X 8G should be a lot faster than the Radeon R9 M390X in general. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 224000 (140%)

Texel Rate

The Radeon R9 390X 8G is quite a bit (about 100%) better at AF than the Radeon R9 M390X. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 92256 (100%)

Pixel Rate

The Radeon R9 390X 8G will be quite a bit (more or less 190%) better at full screen anti-aliasing than the Radeon R9 M390X, and also will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 44064 (190%)

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 largest amount of data (measured in megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at 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 the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core 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 is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.