Radeon HD 3850 1GB vs Radeon R9 M265X

Intro

Compare those specs to the Radeon R9 M265X, which features core clock speeds of 575 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 memory. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon R9 M265X should in theory be a lot better than the Radeon HD 3850 1GB overall. (explain)

Radeon R9 M265X		72000 MB/sec
Radeon HD 3850 1GB		52992 MB/sec
	Difference: 19008 (36%)

Texel Rate

The Radeon R9 M265X will be much (approximately 115%) better at texture filtering than the Radeon HD 3850 1GB. (explain)

Radeon R9 M265X		23000 Mtexels/sec
Radeon HD 3850 1GB		10688 Mtexels/sec
	Difference: 12312 (115%)

Pixel Rate

The Radeon HD 3850 1GB should be just a bit (more or less 16%) more effective at FSAA than the Radeon R9 M265X, and able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 3850 1GB		10688 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 1488 (16%)

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 largest amount of information (counted in MB per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.