GeForce GTX 850M vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which features clock speeds of 940 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 320 SPUs along with 20 TAUs and 8 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce GTX 850M will be 100% faster than the Radeon R5 M255 in general, because of its higher bandwidth. (explain)

GeForce GTX 850M		32000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 16000 (100%)

Texel Rate

The GeForce GTX 850M is quite a bit (approximately 86%) better at texture filtering than the Radeon R5 M255. (explain)

GeForce GTX 850M		35040 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 16240 (86%)

Pixel Rate

The GeForce GTX 850M will be much (approximately 86%) more effective at AA than the Radeon R5 M255, and capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 850M		14016 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 6496 (86%)

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 max amount of information (in units of megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total amount of texture units 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 applied per second.

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