GeForce GTX 260 vs Radeon R5 M255

Intro

Compare all of that to the Radeon R5 M255, which comes with a core clock speed of 940 MHz and a DDR3 memory speed of 1000 MHz. It also uses a 64-bit bus, and makes use of a 28 nm design. It is made up of 320 SPUs, 20 TAUs, and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 260 will be 599% faster than the Radeon R5 M255 overall, because of its higher data rate. (explain)

GeForce GTX 260		111888 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 95888 (599%)

Texel Rate

The GeForce GTX 260 will be quite a bit (about 96%) faster with regards to anisotropic filtering than the Radeon R5 M255. (explain)

GeForce GTX 260		36864 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 18064 (96%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 260 is the winner, by far. (explain)

GeForce GTX 260		16128 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 8608 (114%)

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 (in units of MB per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the video 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 most pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.