Radeon HD 4890 2GB vs Radeon R9 M375X

Intro

Compare those specs to the Radeon R9 M375X, which uses a 28 nm design. AMD has clocked the core speed at 1015 MHz. The GDDR5 RAM is set to run at a speed of 1125 MHz on this specific card. It features 640 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4890 2GB should be much faster than the Radeon R9 M375X in general. (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 little bit (approximately 2%) faster with regards to 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

The Radeon R9 M375X will be a small bit (more or less 2%) more effective at AA than the Radeon HD 4890 2GB, and able to handle higher resolutions without slowing down too much. (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 max amount of data (counted in MB per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 texture map elements (texels) that can be processed in one second. This figure is worked out 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on 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 maximum fill rate.