GeForce GTX 980M vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which features a clock speed of 940 MHz and a DDR3 memory frequency of 1000 MHz. It also makes use of a 64-bit memory bus, and uses a 28 nm design. It is made up of 320 SPUs, 20 TAUs, and 8 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce GTX 980M should in theory be much better than the Radeon R5 M255 in general. (explain)

GeForce GTX 980M		128000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 112000 (700%)

Texel Rate

The GeForce GTX 980M is a lot (more or less 430%) better at AF than the Radeon R5 M255. (explain)

GeForce GTX 980M		99648 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 80848 (430%)

Pixel Rate

The GeForce GTX 980M will be a lot (about 783%) more effective at AA than the Radeon R5 M255, and also able to handle higher resolutions more effectively. (explain)

GeForce GTX 980M		66432 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 58912 (783%)

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 data (in units of MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total number of texture units of the card by the core 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.