Radeon R9 390 8G vs Radeon R9 M280X

Intro

Compare that to the Radeon R9 M280X, which uses a 28 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM is set to run at a speed of 1375 MHz on this specific card. It features 896 SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

As far as performance goes, the Radeon R9 390 8G should theoretically be quite a bit better than the Radeon R9 M280X overall. (explain)

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

Texel Rate

The Radeon R9 390 8G should be a lot (approximately 217%) more effective at anisotropic filtering than the Radeon R9 M280X. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R9 M280X		50400 Mtexels/sec
	Difference: 109600 (217%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 390 8G is superior to the Radeon R9 M280X, and very much so. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R9 M280X		14400 Mpixels/sec
	Difference: 49600 (344%)

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

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure 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 graphics 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 amount of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.