Radeon R9 285 vs Radeon R9 M270X

Intro

Compare those specifications to the Radeon R9 M270X, which makes use of a 28 nm design. AMD has clocked the core frequency at 725 MHz. The GDDR5 memory is set to run at a speed of 1125 MHz on this particular card. It features 640 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 285 will be 144% quicker than the Radeon R9 M270X overall, due to its greater bandwidth. (explain)

Radeon R9 285		176000 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 104000 (144%)

Texel Rate

The Radeon R9 285 will be quite a bit (approximately 255%) more effective at texture filtering than the Radeon R9 M270X. (explain)

Radeon R9 285		102816 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 73816 (255%)

Pixel Rate

The Radeon R9 285 is a lot (approximately 153%) faster with regards to anti-aliasing than the Radeon R9 M270X, and also should be capable of handling higher screen resolutions more effectively. (explain)

Radeon R9 285		29376 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 17776 (153%)

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 (in units of megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total number of texture units by the core 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 in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the 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 core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.