Radeon R9 285 vs Radeon R9 M385X

Intro

Compare those specifications to the Radeon R9 M385X, which has GPU clock speed of 1100 MHz, and 4096 MB of GDDR5 memory set to run at 1500 MHz through a 128-bit bus. It also is made up of 896 Stream Processors, 56 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 285 should theoretically be a lot faster than the Radeon R9 M385X in general. (explain)

Radeon R9 285		176000 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 80000 (83%)

Texel Rate

The Radeon R9 285 should be quite a bit (approximately 67%) more effective at texture filtering than the Radeon R9 M385X. (explain)

Radeon R9 285		102816 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 41216 (67%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 285 is a better choice, and very much so. (explain)

Radeon R9 285		29376 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 11776 (67%)

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 (counted in MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher 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 most pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.