GeForce GTX 980 vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which has GPU core speed of 940 MHz, and 2048 MB of DDR3 memory set to run at 1000 MHz through a 64-bit bus. It also features 320 SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce GTX 980 should in theory be quite a bit better than the Radeon R5 M255 overall. (explain)

GeForce GTX 980		224000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 208000 (1300%)

Texel Rate

The GeForce GTX 980 should be quite a bit (approximately 667%) more effective at anisotropic filtering than the Radeon R5 M255. (explain)

GeForce GTX 980		144128 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 125328 (667%)

Pixel Rate

The GeForce GTX 980 should be a lot (approximately 858%) faster with regards to AA than the Radeon R5 M255, and will be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 980		72064 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 64544 (858%)

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 max amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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