Radeon R9 285 vs Radeon R9 M265X

Intro

Compare all of that to the Radeon R9 M265X, which has a clock frequency of 575 MHz and a GDDR5 memory speed of 1125 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 285 should be 144% quicker than the Radeon R9 M265X in general, due to its higher bandwidth. (explain)

Radeon R9 285		176000 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 104000 (144%)

Texel Rate

The Radeon R9 285 will be a lot (approximately 347%) faster with regards to texture filtering than the Radeon R9 M265X. (explain)

Radeon R9 285		102816 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 79816 (347%)

Pixel Rate

The Radeon R9 285 is quite a bit (approximately 219%) more effective at AA than the Radeon R9 M265X, and also capable of handling higher screen resolutions better. (explain)

Radeon R9 285		29376 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 20176 (219%)

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 information (counted in MB per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.