Radeon HD 3870 512MB vs Radeon R9 M375

Intro

Compare that to the Radeon R9 M375, which features core speeds of 1015 MHz on the GPU, and 1100 MHz on the 4096 MB of DDR3 memory. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 3870 512MB should theoretically be much better than the Radeon R9 M375 in general. (explain)

Radeon HD 3870 512MB		57600 MB/sec
Radeon R9 M375		35200 MB/sec
	Difference: 22400 (64%)

Texel Rate

The Radeon R9 M375 should be a lot (about 227%) better at anisotropic filtering than the Radeon HD 3870 512MB. (explain)

Radeon R9 M375		40600 Mtexels/sec
Radeon HD 3870 512MB		12400 Mtexels/sec
	Difference: 28200 (227%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R9 M375 is the winner, by a large margin. (explain)

Radeon R9 M375		16240 Mpixels/sec
Radeon HD 3870 512MB		12400 Mpixels/sec
	Difference: 3840 (31%)

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 data (counted in megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics 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 number of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.