Radeon R5 M255 vs Radeon R9 390X 8G

Intro

Compare those specifications to the Radeon R9 390X 8G, which has GPU clock speed of 1050 MHz, and 8192 MB of GDDR5 RAM running at 1500 MHz through a 512-bit bus. It also is comprised of 2816 Stream Processors, 176 Texture Address Units, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon R9 390X 8G should theoretically be quite a bit superior to the Radeon R5 M255 overall. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 368000 (2300%)

Texel Rate

The Radeon R9 390X 8G should be quite a bit (approximately 883%) faster with regards to texture filtering than the Radeon R5 M255. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 166000 (883%)

Pixel Rate

The Radeon R9 390X 8G should be quite a bit (about 794%) faster with regards to full screen anti-aliasing than the Radeon R5 M255, and capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 59680 (794%)

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 information (in units of megabytes per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 are applied per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the 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 chip can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out 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 drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.