Radeon R9 270 vs Radeon R9 M385X

Intro

Compare those specifications to the Radeon R9 M385X, which comes with clock speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 RAM. It features 896 SPUs as well as 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 270 should be 87% faster than the Radeon R9 M385X overall, due to its higher bandwidth. (explain)

Radeon R9 270		179200 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 83200 (87%)

Texel Rate

The Radeon R9 270 is a small bit (approximately 17%) faster with regards to texture filtering than the Radeon R9 M385X. (explain)

Radeon R9 270		72000 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 10400 (17%)

Pixel Rate

The Radeon R9 270 is quite a bit (more or less 64%) faster with regards to anti-aliasing than the Radeon R9 M385X, and able to handle higher screen resolutions more effectively. (explain)

Radeon R9 270		28800 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 11200 (64%)

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 largest amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.