Radeon HD 7870 XT vs Radeon R9 M375

Intro

Compare all that to the Radeon R9 M375, which has core speeds of 1015 MHz on the GPU, and 1100 MHz on the 4096 MB of DDR3 RAM. It features 640 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 7870 XT is 445% faster than the Radeon R9 M375 overall, because of its higher bandwidth. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon R9 M375		35200 MB/sec
	Difference: 156800 (445%)

Texel Rate

The Radeon HD 7870 XT is much (more or less 119%) more effective at anisotropic filtering than the Radeon R9 M375. (explain)

Radeon HD 7870 XT		88800 Mtexels/sec
Radeon R9 M375		40600 Mtexels/sec
	Difference: 48200 (119%)

Pixel Rate

The Radeon HD 7870 XT should be much (approximately 82%) more effective at anti-aliasing than the Radeon R9 M375, and also capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon R9 M375		16240 Mpixels/sec
	Difference: 13360 (82%)

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 (in units of megabytes per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the card's bus 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 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 can be processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of 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.