Radeon HD 3650 512MB vs Radeon R5 M255

Intro

Compare all of that to the Radeon R5 M255, which has GPU clock speed of 940 MHz, and 2048 MB of DDR3 RAM running at 1000 MHz through a 64-bit bus. It also features 320 SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3650 512MB is 60% faster than the Radeon R5 M255 overall, due to its higher bandwidth. (explain)

Radeon HD 3650 512MB		25600 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 9600 (60%)

Texel Rate

The Radeon R5 M255 is quite a bit (about 224%) faster with regards to AF than the Radeon HD 3650 512MB. (explain)

Radeon R5 M255		18800 Mtexels/sec
Radeon HD 3650 512MB		5800 Mtexels/sec
	Difference: 13000 (224%)

Pixel Rate

The Radeon R5 M255 is much (approximately 159%) better at FSAA than the Radeon HD 3650 512MB, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon R5 M255		7520 Mpixels/sec
Radeon HD 3650 512MB		2900 Mpixels/sec
	Difference: 4620 (159%)

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 maximum amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

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