Radeon R5 M255 vs Radeon R9 295X2

Intro

Compare those specifications to the Radeon R9 295X2, which has GPU core speed of 1018 MHz, and 4096 MB of GDDR5 memory set to run at 1250 MHz through a 512-bit bus. It also is comprised of 2816 Stream Processors, 176 Texture Address Units, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 295X2 should theoretically perform a lot faster than the Radeon R5 M255 in general. (explain)

Radeon R9 295X2		640000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 624000 (3900%)

Texel Rate

The Radeon R9 295X2 should be a lot (more or less 1806%) faster with regards to anisotropic filtering than the Radeon R5 M255. (explain)

Radeon R9 295X2		358336 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 339536 (1806%)

Pixel Rate

The Radeon R9 295X2 is a lot (approximately 1633%) better at AA than the Radeon R5 M255, and capable of handling higher resolutions better. (explain)

Radeon R9 295X2		130304 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 122784 (1633%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.