Radeon R9 390X 8G vs Radeon R9 M385X

Intro

Compare those specs to the Radeon R9 M385X, which has core speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 memory. It features 896 SPUs along with 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon R9 390X 8G should in theory be a lot superior to the Radeon R9 M385X in general. (explain)

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

Texel Rate

The Radeon R9 390X 8G should be quite a bit (more or less 200%) better at AF than the Radeon R9 M385X. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 123200 (200%)

Pixel Rate

The Radeon R9 390X 8G should be a lot (approximately 282%) better at AA than the Radeon R9 M385X, and able to handle higher screen resolutions more effectively. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 49600 (282%)

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 maximum amount of information (in units of MB per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is calculated 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.