Radeon HD 4870 2GB vs Radeon R9 M365X

Intro

Compare that to the Radeon R9 M365X, which comes with clock speeds of 925 MHz on the GPU, and 1125 MHz on the 4096 MB of GDDR5 memory. It features 640 SPUs as well as 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4870 2GB should be 60% quicker than the Radeon R9 M365X in general, because of its greater data rate. (explain)

Radeon HD 4870 2GB		115200 MB/sec
Radeon R9 M365X		72000 MB/sec
	Difference: 43200 (60%)

Texel Rate

The Radeon R9 M365X should be much (more or less 23%) faster with regards to texture filtering than the Radeon HD 4870 2GB. (explain)

Radeon R9 M365X		37000 Mtexels/sec
Radeon HD 4870 2GB		30000 Mtexels/sec
	Difference: 7000 (23%)

Pixel Rate

The Radeon R9 M365X should be a lot (more or less 23%) more effective at anti-aliasing than the Radeon HD 4870 2GB, and should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 M365X		14800 Mpixels/sec
Radeon HD 4870 2GB		12000 Mpixels/sec
	Difference: 2800 (23%)

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 maximum amount of information (measured in MB per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type memory, the result should 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.