Radeon R9 M290X vs Radeon R9 M390X

Intro

Compare all that to the Radeon R9 M390X, which features a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is comprised of 2048 Stream Processors, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M290X		100 Watts
Radeon R9 M390X		125 Watts
	Difference: 25 Watts (25%)

Memory Bandwidth

In theory, the Radeon R9 M390X should be a bit faster than the Radeon R9 M290X overall. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon R9 M290X		153600 MB/sec
	Difference: 6400 (4%)

Texel Rate

The Radeon R9 M390X should be quite a bit (more or less 36%) faster with regards to texture filtering than the Radeon R9 M290X. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon R9 M290X		68000 Mtexels/sec
	Difference: 24544 (36%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 M290X is a better choice, though only just barely. (explain)

Radeon R9 M290X		27200 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 4064 (18%)

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 largest amount of data (counted in MB per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the graphics 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 maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.