Radeon HD 4890 1GB vs Radeon R9 M375

Intro

Compare that to the Radeon R9 M375, which features a clock frequency of 1015 MHz and a DDR3 memory speed of 1100 MHz. It also features a 128-bit memory bus, and uses a 28 nm design. It is comprised of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4890 1GB is 255% quicker than the Radeon R9 M375 overall, because of its greater data rate. (explain)

Radeon HD 4890 1GB		124800 MB/sec
Radeon R9 M375		35200 MB/sec
	Difference: 89600 (255%)

Texel Rate

The Radeon R9 M375 will be a little bit (approximately 2%) better at AF than the Radeon HD 4890 1GB. (explain)

Radeon R9 M375		40600 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 600 (2%)

Pixel Rate

The Radeon R9 M375 is a small bit (approximately 2%) better at AA than the Radeon HD 4890 1GB, and also should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 M375		16240 Mpixels/sec
Radeon HD 4890 1GB		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 information (counted in MB per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster 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 texture map elements (texels) that can be processed in one second. This is calculated 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 video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.