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Radeon HD 7850 vs Radeon R9 285

Intro

The Radeon HD 7850 has a core clock speed of 860 MHz and a GDDR5 memory speed of 1200 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 1024 SPUs, 64 Texture Address Units, and 32 ROPs.

Compare those specs to the Radeon R9 285, which has a core clock frequency of 918 MHz and a GDDR5 memory speed of 1375 MHz. It also makes use of a 256-bit bus, and makes use of a 28 nm design. It features 1792 SPUs, 112 TAUs, and 32 Raster Operation 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 HD 7850 5200 points
Difference: 3300 (63%)

Ethereum Mining Hash Rate

Radeon R9 285 18 Mh/s
Radeon HD 7850 13 Mh/s
Difference: 5 (38%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Radeon R9 285 190 Watts
Difference: 60 Watts (46%)

Memory Bandwidth

In theory, the Radeon R9 285 should be a bit faster than the Radeon HD 7850 in general. (explain)

Radeon R9 285 176000 MB/sec
Radeon HD 7850 153600 MB/sec
Difference: 22400 (15%)

Texel Rate

The Radeon R9 285 should be quite a bit (more or less 87%) more effective at texture filtering than the Radeon HD 7850. (explain)

Radeon R9 285 102816 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 47776 (87%)

Pixel Rate

The Radeon R9 285 should be a little bit (approximately 7%) better at anti-aliasing than the Radeon HD 7850, and able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 285 29376 Mpixels/sec
Radeon HD 7850 27520 Mpixels/sec
Difference: 1856 (7%)

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 7850

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 HD 7850 Radeon R9 285
Manufacturer AMD AMD
Year March 2012 September 2014
Code Name Pitcairn Pro Tonga PRO
Memory 2048 MB 2048 MB
Core Speed 860 MHz 918 MHz
Memory Speed 4800 MHz 5500 MHz
Power (Max TDP) 130 watts 190 watts
Bandwidth 153600 MB/sec 176000 MB/sec
Texel Rate 55040 Mtexels/sec 102816 Mtexels/sec
Pixel Rate 27520 Mpixels/sec 29376 Mpixels/sec
Unified Shaders 1024 1792
Texture Mapping Units 64 112
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 11.1 DirectX 12.0
OpenGL Version OpenGL 4.2 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 worked out by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 amount of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the graphics 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 its 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 clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 7850

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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