Radeon R9 280X vs Radeon R9 M275X

Intro

Compare all of that to the Radeon R9 M275X, which comes with core 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 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

As far as performance goes, the Radeon R9 280X should in theory be much better than the Radeon R9 M275X overall. (explain)

Radeon R9 280X		288000 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 216000 (300%)

Texel Rate

The Radeon R9 280X is quite a bit (about 202%) better at anisotropic filtering than the Radeon R9 M275X. (explain)

Radeon R9 280X		108800 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 72800 (202%)

Pixel Rate

The Radeon R9 280X is a lot (approximately 89%) better at AA than the Radeon R9 M275X, and will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 280X		27200 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 12800 (89%)

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 largest amount of data (in units of MB per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.