Radeon R7 M260X vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which comes with a GPU core clock speed of 1000 MHz, and 8192 MB of GDDR5 memory set to run at 1500 MHz through a 512-bit bus. It also features 2560 Stream Processors, 160 TAUs, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 390 8G should be 500% quicker than the Radeon R7 M260X in general, because of its higher data rate. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon R7 M260X		64000 MB/sec
	Difference: 320000 (500%)

Texel Rate

The Radeon R9 390 8G will be a lot (about 708%) more effective at texture filtering than the Radeon R7 M260X. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R7 M260X		19800 Mtexels/sec
	Difference: 140200 (708%)

Pixel Rate

The Radeon R9 390 8G is a lot (approximately 870%) better at AA than the Radeon R7 M260X, and will be able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R7 M260X		6600 Mpixels/sec
	Difference: 57400 (870%)

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 maximum amount of information (counted in MB per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the video 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 amount of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant 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.