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Radeon R9 270X vs Radeon R9 285

Intro

The Radeon R9 270X features core clock speeds of 1000 MHz on the GPU, and 1400 MHz on the 2048 MB of GDDR5 memory. It features 1280 SPUs along with 80 Texture Address Units and 32 ROPs.

Compare those specs to the Radeon R9 285, which uses a 28 nm design. AMD has clocked the core speed at 918 MHz. The GDDR5 RAM is set to run at a frequency of 1375 MHz on this specific model. It features 1792 SPUs along with 112 Texture Address Units and 32 Rasterization Operator Units.

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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

Performance-wise, the Radeon R9 270X should in theory be a little bit superior to 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 is much (more or less 29%) more effective at anisotropic filtering than the Radeon R9 270X. (explain)

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

Pixel Rate

The Radeon R9 270X should be a small bit (approximately 9%) better at full screen anti-aliasing than the Radeon R9 285, and able to handle higher resolutions without losing too much performance. (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: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 are applied in one second. This is calculated by multiplying the total texture units 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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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.

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