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Radeon HD 7850 vs Radeon HD 7870 XT

Intro

The Radeon HD 7850 uses a 28 nm design. AMD has set the core speed at 860 MHz. The GDDR5 RAM runs at a frequency of 1200 MHz on this specific model. It features 1024 SPUs along with 64 Texture Address Units and 32 Rasterization Operator Units.

Compare all that to the Radeon HD 7870 XT, which features a core clock speed of 925 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 256-bit memory bus, and uses a 28 nm design. It features 1536 SPUs, 96 TAUs, and 32 ROPs.

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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 HD 7870 XT 6390 points
Radeon HD 7850 5200 points
Difference: 1190 (23%)

Ethereum Mining Hash Rate

Radeon HD 7870 XT 15 Mh/s
Radeon HD 7850 13 Mh/s
Difference: 2 (15%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Radeon HD 7870 XT 185 Watts
Difference: 55 Watts (42%)

Memory Bandwidth

Theoretically, the Radeon HD 7870 XT should perform a lot faster than the Radeon HD 7850 in general. (explain)

Radeon HD 7870 XT 192000 MB/sec
Radeon HD 7850 153600 MB/sec
Difference: 38400 (25%)

Texel Rate

The Radeon HD 7870 XT should be much (approximately 61%) more effective at AF than the Radeon HD 7850. (explain)

Radeon HD 7870 XT 88800 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 33760 (61%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7870 XT is a better choice, not by a very large margin though. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
Radeon HD 7850 27520 Mpixels/sec
Difference: 2080 (8%)

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

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Radeon HD 7870 XT

Amazon.com

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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 HD 7870 XT
Manufacturer AMD AMD
Year March 2012 November 2012
Code Name Pitcairn Pro Tahiti LE
Memory 2048 MB 2048 MB
Core Speed 860 MHz 925 MHz
Memory Speed 4800 MHz 6000 MHz
Power (Max TDP) 130 watts 185 watts
Bandwidth 153600 MB/sec 192000 MB/sec
Texel Rate 55040 Mtexels/sec 88800 Mtexels/sec
Pixel Rate 27520 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 1024 1536
Texture Mapping Units 64 96
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-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 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 7850

Amazon.com

Check prices at:

Radeon HD 7870 XT

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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