Radeon R5 M255 vs Radeon R9 270

Intro

Compare all of that to the Radeon R9 270, which comes with GPU clock speed of 900 MHz, and 2048 MB of GDDR5 memory running at 1400 MHz through a 256-bit bus. It also features 1280 SPUs, 80 TAUs, and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 270, in theory, should perform a lot faster than the Radeon R5 M255 in general. (explain)

Radeon R9 270		179200 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 163200 (1020%)

Texel Rate

The Radeon R9 270 should be much (about 283%) more effective at texture filtering than the Radeon R5 M255. (explain)

Radeon R9 270		72000 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 53200 (283%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 270 is the winner, by a large margin. (explain)

Radeon R9 270		28800 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 21280 (283%)

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 (measured in MB per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.