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Radeon R9 270X vs Radeon R9 285

Intro

The Radeon R9 270X comes with a GPU clock speed of 1000 MHz, and the 2048 MB of GDDR5 memory runs at 1400 MHz through a 256-bit bus. It also features 1280 SPUs, 80 TAUs, and 32 ROPs.

Compare those specs to the Radeon R9 285, which comes with GPU core speed of 918 MHz, and 2048 MB of GDDR5 RAM running at 1375 MHz through a 256-bit bus. It also is comprised of 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

In theory, the Radeon R9 270X should be a small bit faster than the Radeon R9 285 overall. (explain)

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

Texel Rate

The Radeon R9 285 should be quite a bit (more or less 29%) more effective at AF than the Radeon R9 270X. (explain)

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

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 270X is superior to the Radeon R9 285, though only just barely. (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

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Radeon R9 270X

Amazon.com

Check prices at:

Radeon R9 285

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon R9 270X Radeon R9 285
Manufacturer AMD AMD
Year October 2013 September 2014
Code Name Curacao XT Tonga PRO
Memory 2048 MB 2048 MB
Core Speed 1000 MHz 918 MHz
Memory Speed 5600 MHz 5500 MHz
Power (Max TDP) 180 watts 190 watts
Bandwidth 179200 MB/sec 176000 MB/sec
Texel Rate 80000 Mtexels/sec 102816 Mtexels/sec
Pixel Rate 32000 Mpixels/sec 29376 Mpixels/sec
Unified Shaders 1280 1792
Texture Mapping Units 80 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 2800 million 5000 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.2 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.4

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core 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 rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon R9 270X

Amazon.com

Check prices at:

Radeon R9 285

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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