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Radeon HD 7850 vs Radeon R9 280X

Intro

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

Compare those specs to the Radeon R9 280X, which comes with a clock speed of 850 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 384-bit memory bus, and makes use of a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

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

In theory, the Radeon R9 280X is 88% faster than the Radeon HD 7850 in general, because of its higher bandwidth. (explain)

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

Texel Rate

The Radeon R9 280X should be quite a bit (approximately 98%) better at texture filtering than the Radeon HD 7850. (explain)

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7850 is a better choice, but only just. (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

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

Model Radeon HD 7850 Radeon R9 280X
Manufacturer AMD AMD
Year March 2012 October 2013
Code Name Pitcairn Pro Tahiti XTL
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 3072 MB
Core Speed 860 MHz 850 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1200 MHz (4800 MHz effective) 1500 MHz (6000 MHz effective)
Unified Shaders 1024 2048
Texture Mapping Units 64 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.2 OpenGL 4.3
Power (Max TDP) 130 watts 250 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 288000 MB/sec
Texel Rate 55040 Mtexels/sec 108800 Mtexels/sec
Pixel Rate 27520 Mpixels/sec 27200 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of information (measured in MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant 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 max fill rate.

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