Radeon R9 285 vs Radeon R9 M380

Intro

Compare those specs to the Radeon R9 M380, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory runs at a speed of 1500 MHz on this card. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon R9 285 should be much faster than the Radeon R9 M380 overall. (explain)

Radeon R9 285		176000 MB/sec
Radeon R9 M380		96000 MB/sec
	Difference: 80000 (83%)

Texel Rate

The Radeon R9 285 will be much (approximately 157%) more effective at texture filtering than the Radeon R9 M380. (explain)

Radeon R9 285		102816 Mtexels/sec
Radeon R9 M380		40000 Mtexels/sec
	Difference: 62816 (157%)

Pixel Rate

The Radeon R9 285 is much (approximately 84%) better at anti-aliasing than the Radeon R9 M380, and should be able to handle higher screen resolutions while still performing well. (explain)

Radeon R9 285		29376 Mpixels/sec
Radeon R9 M380		16000 Mpixels/sec
	Difference: 13376 (84%)

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 data (in units of megabytes per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics 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 maximum amount of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.