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Radeon HD 7770 vs Radeon HD 7850


The Radeon HD 7770 features core clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 7850, which features GPU clock speed of 860 MHz, and 2048 MB of GDDR5 RAM set to run at 1200 MHz through a 256-bit bus. It also is comprised of 1024 Stream Processors, 64 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon HD 7850 130 Watts
Difference: 50 Watts (63%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7850 will be 113% quicker than the Radeon HD 7770 in general, because of its higher bandwidth. (explain)

Radeon HD 7850 153600 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 81600 (113%)

Texel Rate

The Radeon HD 7850 should be quite a bit (approximately 38%) more effective at anisotropic filtering than the Radeon HD 7770. (explain)

Radeon HD 7850 55040 Mtexels/sec
Radeon HD 7770 40000 Mtexels/sec
Difference: 15040 (38%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7850 is a better choice, and very much so. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 11520 (72%)

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 7770

Radeon HD 7850

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.


Display Specifications

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Model Radeon HD 7770 Radeon HD 7850
Manufacturer AMD AMD
Year February 2012 March 2012
Code Name Cape Verde XT Pitcairn Pro
Memory 1024 MB 2048 MB
Core Speed 1000 MHz 860 MHz
Memory Speed 4500 MHz 4800 MHz
Power (Max TDP) 80 watts 130 watts
Bandwidth 72000 MB/sec 153600 MB/sec
Texel Rate 40000 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 640 1024
Texture Mapping Units 40 64
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 1500 million 2800 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2

Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.


4 Responses to “Radeon HD 7770 vs Radeon HD 7850”
PS4 vs Xbox One (?) says:

Similar, but not exact.

add says:

Add ASUS 7770 2GB!
Otherwise this makes bad comparison

Min Nguyen says:

I agree ASUS Radeon HD 7770 2GD5 needs to be added.

James Adkins says:

i dont see why these older cards are about the same price as the r9 270x... i can get one of the 7850's from ebay for $90 as well lol

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