Radeon R9 280 vs Radeon R9 M275X

Intro

Compare all of that to the Radeon R9 M275X, which has clock speeds of 900 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 RAM. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon R9 280		250 Watts
	Difference: 200 Watts (400%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 280 should be 233% quicker than the Radeon R9 M275X in general, because of its higher bandwidth. (explain)

Radeon R9 280		240000 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 168000 (233%)

Texel Rate

The Radeon R9 280 should be quite a bit (approximately 190%) more effective at anisotropic filtering than the Radeon R9 M275X. (explain)

Radeon R9 280		104496 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 68496 (190%)

Pixel Rate

The Radeon R9 280 should be a lot (approximately 107%) more effective at anti-aliasing than the Radeon R9 M275X, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon R9 280		29856 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 15456 (107%)

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 maximum amount of data (counted in MB per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total 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 per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.