Radeon HD 4890 2GB vs Radeon R9 M375

Intro

Compare all that to the Radeon R9 M375, which makes use of a 28 nm design. AMD has clocked the core frequency at 1015 MHz. The DDR3 RAM runs at a speed of 1100 MHz on this model. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4890 2GB will be 255% faster than the Radeon R9 M375 overall, due to its higher bandwidth. (explain)

Radeon HD 4890 2GB		124800 MB/sec
Radeon R9 M375		35200 MB/sec
	Difference: 89600 (255%)

Texel Rate

The Radeon R9 M375 should be a little bit (more or less 2%) better at texture filtering than the Radeon HD 4890 2GB. (explain)

Radeon R9 M375		40600 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 600 (2%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 M375 is the winner, not by a very large margin though. (explain)

Radeon R9 M375		16240 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 240 (2%)

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 transferred over the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 amount of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling 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 graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs 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 is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.