Radeon R9 390X 8G vs Radeon R9 M280X

Intro

Compare those specifications to the Radeon R9 M280X, which uses a 28 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM works at a speed of 1375 MHz on this model. It features 896 SPUs as well as 56 TAUs and 16 Rasterization Operator Units.

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 perform a lot 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 (about 267%) better at texture filtering than the Radeon R9 M280X. (explain)

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

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 390X 8G is the winner, by far. (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: Bandwidth is the max amount of information (measured in megabytes per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video 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 card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.