Radeon R9 290 vs Radeon R9 M275X

Intro

Compare all of that to the Radeon R9 M275X, which has GPU clock speed of 900 MHz, and 2048 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon R9 290		300 Watts
	Difference: 250 Watts (500%)

Memory Bandwidth

Theoretically, the Radeon R9 290 should be a lot faster than the Radeon R9 M275X overall. (explain)

Radeon R9 290		320000 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 248000 (344%)

Texel Rate

The Radeon R9 290 should be quite a bit (approximately 256%) faster with regards to AF than the Radeon R9 M275X. (explain)

Radeon R9 290		128000 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 92000 (256%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 290 is a better choice, by a large margin. (explain)

Radeon R9 290		51200 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 36800 (256%)

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 data (measured in MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed 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 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 that the graphics chip 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 number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.