Radeon HD 4870 2GB vs Radeon R9 M375

Intro

Compare those specifications to the Radeon R9 M375, which features GPU clock speed of 1015 MHz, and 4096 MB of DDR3 RAM set to run at 1100 MHz through a 128-bit bus. It also is comprised of 640 Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 2GB should perform much 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 quite a bit (approximately 35%) faster with regards to AF 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

The Radeon R9 M375 should be much (about 35%) faster with regards to FSAA than the Radeon HD 4870 2GB, and able to handle higher screen resolutions more effectively. (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: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, 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 figure is worked out by multiplying the total number of texture units of the card by the core 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many 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.