Radeon R9 290X vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which comes with GPU core speed of 723 MHz, and 4096 MB of GDDR5 memory set to run at 1250 MHz through a 256-bit bus. It also is comprised of 2048 Stream Processors, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Radeon R9 290X		300 Watts
	Difference: 175 Watts (140%)

Memory Bandwidth

As far as performance goes, the Radeon R9 290X should in theory be quite a bit better than the Radeon R9 M390X overall. (explain)

Radeon R9 290X		320000 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 160000 (100%)

Texel Rate

The Radeon R9 290X is a lot (about 52%) more effective at anisotropic filtering than the Radeon R9 M390X. (explain)

Radeon R9 290X		140800 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 48256 (52%)

Pixel Rate

The Radeon R9 290X will be quite a bit (more or less 121%) more effective at full screen anti-aliasing than the Radeon R9 M390X, and also should be able to handle higher screen resolutions more effectively. (explain)

Radeon R9 290X		51200 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 28064 (121%)

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 data (measured in megabytes per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total texture units of the card by the core clock 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 applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.