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Radeon HD 7850 vs Radeon R7 260X

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 features 1024 SPUs, 64 TAUs, and 32 Raster Operation Units.

Compare all that to the Radeon R7 260X, which comes with GPU clock speed of 1100 MHz, and 2048 MB of GDDR5 RAM running at 1625 MHz through a 128-bit bus. It also is comprised of 896 Stream Processors, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 260X 115 Watts
Radeon HD 7850 130 Watts
Difference: 15 Watts (13%)

Memory Bandwidth

Theoretically, the Radeon HD 7850 should perform much faster than the Radeon R7 260X overall. (explain)

Radeon HD 7850 153600 MB/sec
Radeon R7 260X 104000 MB/sec
Difference: 49600 (48%)

Texel Rate

The Radeon R7 260X will be a bit (about 12%) more effective at AF than the Radeon HD 7850. (explain)

Radeon R7 260X 61600 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 6560 (12%)

Pixel Rate

The Radeon HD 7850 will be much (more or less 56%) better at anti-aliasing than the Radeon R7 260X, and also will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon R7 260X 17600 Mpixels/sec
Difference: 9920 (56%)

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 R7 260X

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 R7 260X
Manufacturer AMD AMD
Year March 2012 October 2013
Code Name Pitcairn Pro Bonaire XTX
Memory 2048 MB 2048 MB
Core Speed 860 MHz 1100 MHz
Memory Speed 4800 MHz 6500 MHz
Power (Max TDP) 130 watts 115 watts
Bandwidth 153600 MB/sec 104000 MB/sec
Texel Rate 55040 Mtexels/sec 61600 Mtexels/sec
Pixel Rate 27520 Mpixels/sec 17600 Mpixels/sec
Unified Shaders 1024 896
Texture Mapping Units 64 56
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 28 nm 28 nm
Transistors 2800 million 2080 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 (counted in MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR 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 anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics 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 most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core 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 output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

4 Responses to “Radeon HD 7850 vs Radeon R7 260X”
Muky says:

You were wrong with TEXEL RATE... You wrote... 7850 = 64 TMU=55040 TR and R7 260X = 56 TMU = 61600 TR.

Muky says:

My mistake... It's OK! Sorry! :)

Blair says:

Uh the 7850 has a TDP of 150Watts watts not 130Watts. That's why it is such a great overclocking GPU. You could make it perform almost even with a stock 7870 if you could get a high stable overclock.

Blair says:

(Quote:)You were wrong with TEXEL RATE... You wrote... 7850 = 64 TMU=55040 TR and R7 260X = 56 TMU = 61600 TR.

This might be true with a factory overclocked card. but Stock clock the 260X has a higher texel rate. That does not mean it is faster. You have to keep in consideration the other numbers.

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