Radeon HD 3690/3830 vs Radeon R5 M255

Intro

Compare those specs to the Radeon R5 M255, which features GPU clock speed of 940 MHz, and 2048 MB of DDR3 RAM set to run at 1000 MHz through a 64-bit bus. It also features 320 SPUs, 20 TAUs, and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 3690/3830 should theoretically be a lot better than the Radeon R5 M255 overall. (explain)

Radeon HD 3690/3830		26496 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 10496 (66%)

Texel Rate

The Radeon R5 M255 is quite a bit (approximately 76%) more effective at texture filtering than the Radeon HD 3690/3830. (explain)

Radeon R5 M255		18800 Mtexels/sec
Radeon HD 3690/3830		10688 Mtexels/sec
	Difference: 8112 (76%)

Pixel Rate

The Radeon HD 3690/3830 is a lot (approximately 42%) faster with regards to full screen anti-aliasing than the Radeon R5 M255, and also will be capable of handling higher screen resolutions better. (explain)

Radeon HD 3690/3830		10688 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 3168 (42%)

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 data (counted in megabytes per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total amount 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.