Radeon HD 7870 XT vs Radeon R9 M385X

Intro

Compare all that to the Radeon R9 M385X, which has core 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 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 7870 XT should theoretically perform quite a bit faster than the Radeon R9 M385X in general. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 96000 (100%)

Texel Rate

The Radeon HD 7870 XT will be quite a bit (more or less 44%) faster with regards to AF than the Radeon R9 M385X. (explain)

Radeon HD 7870 XT		88800 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 27200 (44%)

Pixel Rate

The Radeon HD 7870 XT will be a lot (more or less 68%) faster with regards to full screen anti-aliasing than the Radeon R9 M385X, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 12000 (68%)

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 maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units of the card 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock 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 output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.