Radeon R9 295X2 vs Radeon R9 M390X

Intro

Compare that to the Radeon R9 M390X, which comes with a core clock speed of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Radeon R9 295X2		500 Watts
	Difference: 375 Watts (300%)

Memory Bandwidth

The Radeon R9 295X2 should in theory perform quite a bit faster than the Radeon R9 M390X overall. (explain)

Radeon R9 295X2		640000 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 480000 (300%)

Texel Rate

The Radeon R9 295X2 will be much (more or less 287%) better at texture filtering than the Radeon R9 M390X. (explain)

Radeon R9 295X2		358336 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 265792 (287%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 295X2 is the winner, and very much so. (explain)

Radeon R9 295X2		130304 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 107168 (463%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses 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 can be applied per second. This figure is calculated by multiplying the total texture units 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip 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 ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.