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Radeon HD 7770 vs Radeon HD 7850


Intro

The Radeon HD 7770 features a GPU core speed of 1000 MHz, and the 1024 MB of GDDR5 RAM runs at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Compare all that to the Radeon HD 7850, which makes use of a 28 nm design. AMD has set the core frequency at 860 MHz. The GDDR5 memory runs at a frequency of 1200 MHz on this specific card. It features 1024 SPUs as well as 64 TAUs and 32 Rasterization Operator 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 7850 5200 points
Radeon HD 7770 3180 points
Difference: 2020 (64%)

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 should be 113% faster 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 much (approximately 38%) more effective at AF than the Radeon HD 7770. (explain)

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

Pixel Rate

The Radeon HD 7850 is quite a bit (approximately 72%) faster with regards to anti-aliasing than the Radeon HD 7770, and also able to handle higher resolutions more effectively. (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

Amazon.com

Radeon HD 7850

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 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 information (measured in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR 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 by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - 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 7770

Amazon.com

Radeon HD 7850

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.

Comments

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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