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Radeon HD 7850 vs Radeon HD 7870 XT

Intro

The Radeon HD 7850 has core clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1024 SPUs as well as 64 Texture Address Units and 32 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7870 XT, which features GPU clock speed of 925 MHz, and 2048 MB of GDDR5 RAM running at 1500 MHz through a 256-bit bus. It also features 1536 SPUs, 96 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 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

In theory, the Radeon HD 7870 XT is 25% quicker than the Radeon HD 7850 in general, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 7870 XT will be much (approximately 61%) better 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 running with a high resolution is important to you, then the Radeon HD 7870 XT is the winner, but only just. (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: Bandwidth is the largest amount of information (in units of megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's 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 are processed in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core 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 is also dependant on lots of 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.

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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