Radeon R9 390 8G vs Radeon R9 M385X

Intro

Compare those specs to the Radeon R9 M385X, which has core clock speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 RAM. It features 896 SPUs as well as 56 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 390 8G should in theory perform quite a bit faster than the Radeon R9 M385X in general. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 288000 (300%)

Texel Rate

The Radeon R9 390 8G will be much (approximately 160%) faster with regards to anisotropic filtering than the Radeon R9 M385X. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 98400 (160%)

Pixel Rate

The Radeon R9 390 8G is a lot (more or less 264%) more effective at full screen anti-aliasing than the Radeon R9 M385X, and also capable of handling higher resolutions without losing too much performance. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 46400 (264%)

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 largest amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

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