Radeon HD 4890 2GB vs Radeon R9 M365X

Intro

Compare those specs to the Radeon R9 M365X, which has GPU clock speed of 925 MHz, and 4096 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 4890 2GB should perform a lot faster than the Radeon R9 M365X overall. (explain)

Radeon HD 4890 2GB		124800 MB/sec
Radeon R9 M365X		72000 MB/sec
	Difference: 52800 (73%)

Texel Rate

The Radeon HD 4890 2GB should be a small bit (more or less 8%) faster with regards to AF than the Radeon R9 M365X. (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
Radeon R9 M365X		37000 Mtexels/sec
	Difference: 3000 (8%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4890 2GB is a better choice, not by a very large margin though. (explain)

Radeon HD 4890 2GB		16000 Mpixels/sec
Radeon R9 M365X		14800 Mpixels/sec
	Difference: 1200 (8%)

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: Bandwidth is the max amount of data (measured in megabytes per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum 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 clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends 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 max fill rate.