GeForce GTX 660 Ti vs Radeon R5 M255

Intro

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

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 Ti should be 800% quicker than the Radeon R5 M255 overall, due to its greater bandwidth. (explain)

GeForce GTX 660 Ti		144000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 128000 (800%)

Texel Rate

The GeForce GTX 660 Ti is a lot (more or less 445%) better at texture filtering than the Radeon R5 M255. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 83680 (445%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 660 Ti is superior to the Radeon R5 M255, by a large margin. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 14440 (192%)

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 maximum amount of data (counted in megabytes per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 chip could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core 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 is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.