Radeon R9 270X vs Radeon R9 285

Intro

Compare those specifications 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 features 1792 Stream Processors, 112 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon R9 285		8500 points
Radeon R9 270X		6590 points
	Difference: 1910 (29%)

Ethereum Mining Hash Rate

Radeon R9 270X		18 Mh/s
Radeon R9 285		18 Mh/s
	Difference: 0 (0%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270X		180 Watts
Radeon R9 285		190 Watts
	Difference: 10 Watts (6%)

Memory Bandwidth

The Radeon R9 270X should in theory be a little bit faster than the Radeon R9 285 in general. (explain)

Radeon R9 270X		179200 MB/sec
Radeon R9 285		176000 MB/sec
	Difference: 3200 (2%)

Texel Rate

The Radeon R9 285 should be a lot (more or less 29%) better at texture filtering than the Radeon R9 270X. (explain)

Radeon R9 285		102816 Mtexels/sec
Radeon R9 270X		80000 Mtexels/sec
	Difference: 22816 (29%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 270X is superior to the Radeon R9 285, but it probably won't make a huge difference. (explain)

Radeon R9 270X		32000 Mpixels/sec
Radeon R9 285		29376 Mpixels/sec
	Difference: 2624 (9%)

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 information (counted in megabytes per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the 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 per second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels 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 amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.