GeForce GT 320 vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which uses a 28 nm design. AMD has clocked the core frequency at 940 MHz. The DDR3 memory works at a frequency of 1000 MHz on this model. It features 320 SPUs as well as 20 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GT 320 is 58% faster than the Radeon R5 M255 overall, because of its higher data rate. (explain)

GeForce GT 320		25280 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 9280 (58%)

Texel Rate

The Radeon R5 M255 should be quite a bit (approximately 45%) better at AF than the GeForce GT 320. (explain)

Radeon R5 M255		18800 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 5840 (45%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R5 M255 is superior to the GeForce GT 320, by a large margin. (explain)

Radeon R5 M255		7520 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 3200 (74%)

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 (measured in megabytes per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number 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 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 the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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 of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.