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Radeon R9 270X vs Radeon R9 285

Intro

The Radeon R9 270X uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory works at a frequency of 1400 MHz on this specific card. It features 1280 SPUs along with 80 Texture Address Units and 32 Rasterization Operator Units.

Compare all that to the Radeon R9 285, which comes with a core clock frequency of 918 MHz and a GDDR5 memory speed of 1375 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 1792 SPUs, 112 TAUs, and 32 ROPs.

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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

Theoretically speaking, the Radeon R9 270X will be 2% faster than the Radeon R9 285 overall, because of its greater data rate. (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 (approximately 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 high levels of AA is important to you, then the Radeon R9 270X is a better choice, 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

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Radeon R9 270X

Amazon.com

Radeon R9 285

Amazon.com

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 largest amount of information (in units of MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 are processed in one second. This figure is worked out 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon R9 270X

Amazon.com

Radeon R9 285

Amazon.com

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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