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Radeon HD 7850 vs Radeon HD 7870 XT

Intro

The Radeon HD 7850 features a GPU clock speed of 860 MHz, and the 2048 MB of GDDR5 memory is set to run at 1200 MHz through a 256-bit bus. It also is comprised of 1024 Stream Processors, 64 TAUs, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 7870 XT, which uses a 28 nm design. AMD has set the core speed at 925 MHz. The GDDR5 RAM is set to run at a speed of 1500 MHz on this card. It features 1536 SPUs as well as 96 Texture Address Units 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

Performance-wise, the Radeon HD 7870 XT should theoretically be much better than the Radeon HD 7850 overall. (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 a lot (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 superior to the Radeon HD 7850, though not by far. (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

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.

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 max amount of information (counted in megabytes per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better 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 amount of texture map elements (texels) that are applied per second. This figure 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 card will be at 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 could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core 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 output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach 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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