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Radeon HD 7850 vs Radeon R9 280X


Intro

The Radeon HD 7850 has a clock speed of 860 MHz and a GDDR5 memory speed of 1200 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 1024 SPUs, 64 TAUs, and 32 Raster Operation Units.

Compare those specifications to the Radeon R9 280X, which features GPU clock speed of 850 MHz, and 3072 MB of GDDR5 RAM set to run at 1500 MHz through a 384-bit bus. It also features 2048 SPUs, 128 Texture Address Units, 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 280X 8870 points
Radeon HD 7850 5200 points
Difference: 3670 (71%)

Zcash Mining Hash Rate

Radeon R9 280X 294 Sol/s
Radeon HD 7850 171 Sol/s
Difference: 123 (72%)

Ethereum Mining Hash Rate

Radeon R9 280X 21 Mh/s
Radeon HD 7850 13 Mh/s
Difference: 8 (62%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Radeon R9 280X 250 Watts
Difference: 120 Watts (92%)

Memory Bandwidth

The Radeon R9 280X, in theory, should perform much faster than the Radeon HD 7850 in general. (explain)

Radeon R9 280X 288000 MB/sec
Radeon HD 7850 153600 MB/sec
Difference: 134400 (88%)

Texel Rate

The Radeon R9 280X is much (about 98%) better at AF than the Radeon HD 7850. (explain)

Radeon R9 280X 108800 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 53760 (98%)

Pixel Rate

The Radeon HD 7850 should be a bit (about 1%) more effective at AA than the Radeon R9 280X, and capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon R9 280X 27200 Mpixels/sec
Difference: 320 (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 7850

Amazon.com

Radeon R9 280X

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 HD 7850 Radeon R9 280X
Manufacturer AMD AMD
Year March 2012 October 2013
Code Name Pitcairn Pro Tahiti XTL
Memory 2048 MB 3072 MB
Core Speed 860 MHz 850 MHz
Memory Speed 4800 MHz 6000 MHz
Power (Max TDP) 130 watts 250 watts
Bandwidth 153600 MB/sec 288000 MB/sec
Texel Rate 55040 Mtexels/sec 108800 Mtexels/sec
Pixel Rate 27520 Mpixels/sec 27200 Mpixels/sec
Unified Shaders 1024 2048
Texture Mapping Units 64 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 2800 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Memory 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 card's bus width by the speed of its memory. If the card has DDR memory, 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 anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics 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 maximum amount of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units 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 lots of other factors, especially the memory bandwidth of the card - 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 7850

Amazon.com

Radeon R9 280X

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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