GeForce 940M vs Radeon R5 M255

Intro

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

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Both cards have the exact same bandwidth, so in theory they should have the same performance. (explain)

Texel Rate

The GeForce 940M should be much (approximately 37%) more effective at texture filtering than the Radeon R5 M255. (explain)

GeForce 940M		25728 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 6928 (37%)

Pixel Rate

The GeForce 940M is a small bit (about 14%) faster with regards to anti-aliasing than the Radeon R5 M255, and also should be able to handle higher resolutions without losing too much performance. (explain)

GeForce 940M		8576 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 1056 (14%)

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 data (counted in MB per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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