Radeon R9 M385X vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which uses a 28 nm design. AMD has set the core speed at 723 MHz. The GDDR5 RAM runs at a speed of 1250 MHz on this specific card. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 M390X should theoretically perform a lot faster than the Radeon R9 M385X in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 64000 (67%)

Texel Rate

The Radeon R9 M390X will be much (more or less 50%) more effective at anisotropic filtering than the Radeon R9 M385X. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 30944 (50%)

Pixel Rate

The Radeon R9 M390X should be quite a bit (about 31%) better at FSAA than the Radeon R9 M385X, and should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 5536 (31%)

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 transferred over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 can be processed per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the 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 maximum amount of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated 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 rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.