Radeon HD 4870 2GB vs Radeon R9 M375X

Intro

Compare those specs to the Radeon R9 M375X, which has GPU core speed of 1015 MHz, and 4096 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4870 2GB is 60% quicker than the Radeon R9 M375X in general, due to its greater bandwidth. (explain)

Radeon HD 4870 2GB		115200 MB/sec
Radeon R9 M375X		72000 MB/sec
	Difference: 43200 (60%)

Texel Rate

The Radeon R9 M375X should be quite a bit (approximately 35%) better at AF than the Radeon HD 4870 2GB. (explain)

Radeon R9 M375X		40600 Mtexels/sec
Radeon HD 4870 2GB		30000 Mtexels/sec
	Difference: 10600 (35%)

Pixel Rate

The Radeon R9 M375X should be much (more or less 35%) more effective at FSAA than the Radeon HD 4870 2GB, and able to handle higher resolutions without slowing down too much. (explain)

Radeon R9 M375X		16240 Mpixels/sec
Radeon HD 4870 2GB		12000 Mpixels/sec
	Difference: 4240 (35%)

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 largest amount of information (counted in MB per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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