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Radeon HD 7850 vs Radeon R7 260X

Intro

The Radeon HD 7850 makes use of a 28 nm design. AMD has set the core frequency at 860 MHz. The GDDR5 memory runs at a speed of 1200 MHz on this specific card. It features 1024 SPUs as well as 64 Texture Address Units and 32 Rasterization Operator Units.

Compare that to the Radeon R7 260X, which has core clock speeds of 1100 MHz on the GPU, and 1625 MHz on the 2048 MB of GDDR5 RAM. It features 896 SPUs as well as 56 TAUs and 16 Rasterization Operator 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

Performance-wise, the Radeon HD 7850 should theoretically be a lot superior to 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 just a bit (approximately 12%) better at texture filtering than the Radeon HD 7850. (explain)

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

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 7850 is the winner, by a large margin. (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: Bandwidth is the max amount of information (counted in MB per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, 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 is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs 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 also depends on quite a few other factors, especially the memory bandwidth of the card - 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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