Radeon R9 390 8G vs Radeon R9 M280X

Intro

Compare all of that to the Radeon R9 M280X, which has a clock speed of 900 MHz and a GDDR5 memory speed of 1375 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It features 896 SPUs, 56 Texture Address Units, 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 390 8G		275 Watts
	Difference: 200 Watts (267%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390 8G should be 336% quicker than the Radeon R9 M280X overall, due to its higher data rate. (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 (more or less 217%) more effective at AF than the Radeon R9 M280X. (explain)

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

Pixel Rate

The Radeon R9 390 8G will be a lot (about 344%) faster with regards to FSAA than the Radeon R9 M280X, and will be able to handle higher resolutions without losing too much performance. (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: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. 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 fill 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 get to the max fill rate.