Radeon HD 4870 2GB vs Radeon R9 M375

Intro

Compare all of that to the Radeon R9 M375, which features GPU core speed of 1015 MHz, and 4096 MB of DDR3 memory set to run at 1100 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 2GB should perform a lot faster than the Radeon R9 M375 overall. (explain)

Radeon HD 4870 2GB		115200 MB/sec
Radeon R9 M375		35200 MB/sec
	Difference: 80000 (227%)

Texel Rate

The Radeon R9 M375 should be much (approximately 35%) faster with regards to texture filtering than the Radeon HD 4870 2GB. (explain)

Radeon R9 M375		40600 Mtexels/sec
Radeon HD 4870 2GB		30000 Mtexels/sec
	Difference: 10600 (35%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 M375 is superior to the Radeon HD 4870 2GB, and very much so. (explain)

Radeon R9 M375		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: Bandwidth is the max amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics 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 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. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.