Radeon HD 4890 2GB vs Radeon R9 M375X

Intro

Compare those specs to the Radeon R9 M375X, which comes with GPU core speed of 1015 MHz, and 4096 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 4890 2GB should in theory be much superior to the Radeon R9 M375X overall. (explain)

Radeon HD 4890 2GB		124800 MB/sec
Radeon R9 M375X		72000 MB/sec
	Difference: 52800 (73%)

Texel Rate

The Radeon R9 M375X will be a bit (more or less 2%) better at anisotropic filtering than the Radeon HD 4890 2GB. (explain)

Radeon R9 M375X		40600 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 600 (2%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 M375X is a better choice, though only just barely. (explain)

Radeon R9 M375X		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 largest amount of information (counted in MB per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.