Radeon R7 250X 2GB vs Radeon R9 285

Intro

Compare that to the Radeon R9 285, which has GPU clock speed of 918 MHz, and 2048 MB of GDDR5 memory running at 1375 MHz through a 256-bit bus. It also is comprised of 1792 Stream Processors, 112 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB		95 Watts
Radeon R9 285		190 Watts
	Difference: 95 Watts (100%)

Memory Bandwidth

Theoretically, the Radeon R9 285 should be a lot faster than the Radeon R7 250X 2GB overall. (explain)

Radeon R9 285		176000 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 104000 (144%)

Texel Rate

The Radeon R9 285 should be quite a bit (about 157%) more effective at anisotropic filtering than the Radeon R7 250X 2GB. (explain)

Radeon R9 285		102816 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 62816 (157%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 285 is the winner, by far. (explain)

Radeon R9 285		29376 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 13376 (84%)

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 max amount of information (measured in megabytes per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs 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 rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.