Radeon R9 M265X vs Radeon R9 M280X

Intro

Compare those specifications to the Radeon R9 M280X, which has GPU clock speed of 900 MHz, and 4096 MB of GDDR5 memory set to run at 1375 MHz through a 128-bit bus. It also is made up of 896 Stream Processors, 56 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon R9 M280X should in theory be a lot better than the Radeon R9 M265X in general. (explain)

Radeon R9 M280X		88000 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 16000 (22%)

Texel Rate

The Radeon R9 M280X will be a lot (approximately 119%) more effective at AF than the Radeon R9 M265X. (explain)

Radeon R9 M280X		50400 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 27400 (119%)

Pixel Rate

The Radeon R9 M280X should be quite a bit (more or less 57%) better at anti-aliasing than the Radeon R9 M265X, and should be able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 M280X		14400 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 5200 (57%)

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 maximum amount of information (measured in MB per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, it must 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 are applied in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of 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 fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.