Radeon R9 270 vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which uses a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this particular card. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Radeon R9 270		150 Watts
	Difference: 25 Watts (20%)

Memory Bandwidth

As far as performance goes, the Radeon R9 270 should in theory be a bit better than the Radeon R9 M390X in general. (explain)

Radeon R9 270		179200 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 19200 (12%)

Texel Rate

The Radeon R9 M390X is much (about 29%) faster with regards to anisotropic filtering than the Radeon R9 270. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon R9 270		72000 Mtexels/sec
	Difference: 20544 (29%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 270 is superior to the Radeon R9 M390X, by a large margin. (explain)

Radeon R9 270		28800 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 5664 (24%)

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 max amount of information (counted in MB per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher 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 one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.