GeForce GTS 250 1GB vs Radeon R5 M255

Intro

Compare all that to the Radeon R5 M255, which features GPU clock speed of 940 MHz, and 2048 MB of DDR3 RAM set to run at 1000 MHz through a 64-bit bus. It also is comprised of 320 SPUs, 20 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GTS 250 1GB should theoretically perform much faster than the Radeon R5 M255 in general. (explain)

GeForce GTS 250 1GB		70400 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 54400 (340%)

Texel Rate

The GeForce GTS 250 1GB should be a lot (more or less 151%) more effective at texture filtering than the Radeon R5 M255. (explain)

GeForce GTS 250 1GB		47232 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 28432 (151%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTS 250 1GB is superior to the Radeon R5 M255, by a large margin. (explain)

GeForce GTS 250 1GB		11808 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 4288 (57%)

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 data (measured in megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 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 texture map elements (texels) that are processed in one second. This figure is calculated 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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