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Radeon HD 7870 XT vs Radeon R9 285

Intro

The Radeon HD 7870 XT comes with a GPU core speed of 925 MHz, and the 2048 MB of GDDR5 RAM runs at 1500 MHz through a 256-bit bus. It also is made up of 1536 Stream Processors, 96 Texture Address Units, and 32 ROPs.

Compare those specifications to the Radeon R9 285, which features a core clock frequency of 918 MHz and a GDDR5 memory frequency of 1375 MHz. It also features a 256-bit memory bus, and uses a 28 nm design. It is comprised 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 HD 7870 XT 6390 points
Difference: 2110 (33%)

Ethereum Mining Hash Rate

Radeon R9 285 18 Mh/s
Radeon HD 7870 XT 15 Mh/s
Difference: 3 (20%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT 185 Watts
Radeon R9 285 190 Watts
Difference: 5 Watts (3%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7870 XT should theoretically be a small bit better than the Radeon R9 285 in general. (explain)

Radeon HD 7870 XT 192000 MB/sec
Radeon R9 285 176000 MB/sec
Difference: 16000 (9%)

Texel Rate

The Radeon R9 285 is a small bit (more or less 16%) better at texture filtering than the Radeon HD 7870 XT. (explain)

Radeon R9 285 102816 Mtexels/sec
Radeon HD 7870 XT 88800 Mtexels/sec
Difference: 14016 (16%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7870 XT is superior to the Radeon R9 285, but only just. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
Radeon R9 285 29376 Mpixels/sec
Difference: 224 (1%)

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 HD 7870 XT

Amazon.com

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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 HD 7870 XT Radeon R9 285
Manufacturer AMD AMD
Year November 2012 September 2014
Code Name Tahiti LE Tonga PRO
Memory 2048 MB 2048 MB
Core Speed 925 MHz 918 MHz
Memory Speed 6000 MHz 5500 MHz
Power (Max TDP) 185 watts 190 watts
Bandwidth 192000 MB/sec 176000 MB/sec
Texel Rate 88800 Mtexels/sec 102816 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 29376 Mpixels/sec
Unified Shaders 1536 1792
Texture Mapping Units 96 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 4313 million 5000 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.4

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 are processed per second. This figure is worked out by multiplying the total number of texture units of the card 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. 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 fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 7870 XT

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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