Radeon R9 280 vs Radeon R9 M275X

Intro

Compare all of that to the Radeon R9 M275X, which features core clock speeds of 900 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 RAM. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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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

The Radeon R9 280, in theory, should be much faster than the Radeon R9 M275X overall. (explain)

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

Texel Rate

The Radeon R9 280 is a lot (about 190%) better at AF 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 quite a bit (more or less 107%) better at full screen anti-aliasing than the Radeon R9 M275X, and also should be able to handle higher resolutions without losing too much performance. (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 information (counted in MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 processed per second. This is calculated by multiplying the total amount of texture units of the card by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.