Radeon R9 M270X vs Radeon R9 M390X

Intro

Compare that to the Radeon R9 M390X, which comes with GPU clock speed of 723 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon R9 M390X should theoretically be a lot better than the Radeon R9 M270X in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 88000 (122%)

Texel Rate

The Radeon R9 M390X is quite a bit (approximately 219%) better at texture filtering than the Radeon R9 M270X. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 63544 (219%)

Pixel Rate

The Radeon R9 M390X will be much (about 99%) better at FSAA than the Radeon R9 M270X, and also should be capable of handling higher screen resolutions better. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 11536 (99%)

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 (in units of MB per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.