Radeon R9 390X 8G vs Radeon R9 M280X

Intro

Compare that to the Radeon R9 M280X, which has a clock frequency of 900 MHz and a GDDR5 memory speed of 1375 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is comprised of 896 SPUs, 56 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X		75 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 200 Watts (267%)

Memory Bandwidth

The Radeon R9 390X 8G, in theory, should be much faster than the Radeon R9 M280X in general. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon R9 M280X		88000 MB/sec
	Difference: 296000 (336%)

Texel Rate

The Radeon R9 390X 8G is much (approximately 267%) more effective at AF than the Radeon R9 M280X. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon R9 M280X		50400 Mtexels/sec
	Difference: 134400 (267%)

Pixel Rate

The Radeon R9 390X 8G is quite a bit (more or less 367%) better at FSAA than the Radeon R9 M280X, and should be capable of handling higher resolutions while still performing well. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon R9 M280X		14400 Mpixels/sec
	Difference: 52800 (367%)

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 information (in units of megabytes per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at 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 the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's 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 is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.