Radeon R9 380X vs Radeon R9 M265X

Intro

Compare those specs to the Radeon R9 M265X, which features a GPU core clock speed of 575 MHz, and 2048 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also features 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 380X, in theory, should perform a lot faster than the Radeon R9 M265X in general. (explain)

Radeon R9 380X		182400 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 110400 (153%)

Texel Rate

The Radeon R9 380X should be a lot (about 440%) better at anisotropic filtering than the Radeon R9 M265X. (explain)

Radeon R9 380X		124160 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 101160 (440%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 380X is superior to the Radeon R9 M265X, and very much so. (explain)

Radeon R9 380X		31040 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 21840 (237%)

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: Bandwidth is the max amount of data (in units of megabytes per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 number of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.