Radeon HD 3850 512MB vs Radeon R7 M265

Intro

Compare all that to the Radeon R7 M265, which has GPU core speed of 725 MHz, and 2048 MB of DDR3 RAM running at 1000 MHz through a 128-bit bus. It also features 384 SPUs, 24 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3850 512MB, in theory, should perform much faster than the Radeon R7 M265 overall. (explain)

Radeon HD 3850 512MB		52992 MB/sec
Radeon R7 M265		32000 MB/sec
	Difference: 20992 (66%)

Texel Rate

The Radeon R7 M265 should be quite a bit (about 63%) more effective at anisotropic filtering than the Radeon HD 3850 512MB. (explain)

Radeon R7 M265		17400 Mtexels/sec
Radeon HD 3850 512MB		10688 Mtexels/sec
	Difference: 6712 (63%)

Pixel Rate

The Radeon HD 3850 512MB is quite a bit (more or less 84%) better at full screen anti-aliasing than the Radeon R7 M265, and will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 3850 512MB		10688 Mpixels/sec
Radeon R7 M265		5800 Mpixels/sec
	Difference: 4888 (84%)

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 largest amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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 - the lower the bandwidth is, the lower the potential to get to the max fill rate.