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Radeon HD 6770 1GB vs Radeon HD 7770

Intro

The Radeon HD 6770 1GB makes use of a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM runs at a frequency of 1050 MHz on this card. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7770, which makes use of a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM runs at a frequency of 1125 MHz on this model. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon HD 6770 1GB 108 Watts
Difference: 28 Watts (35%)

Memory Bandwidth

In theory, the Radeon HD 7770 should be a small bit faster than the Radeon HD 6770 1GB in general. (explain)

Radeon HD 7770 72000 MB/sec
Radeon HD 6770 1GB 67200 MB/sec
Difference: 4800 (7%)

Texel Rate

The Radeon HD 7770 will be just a bit (approximately 11%) faster with regards to anisotropic filtering than the Radeon HD 6770 1GB. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 6770 1GB 36000 Mtexels/sec
Difference: 4000 (11%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7770 is a better choice, but not by far. (explain)

Radeon HD 7770 16000 Mpixels/sec
Radeon HD 6770 1GB 14400 Mpixels/sec
Difference: 1600 (11%)

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 6770 1GB

Amazon.com

Radeon HD 7770

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 6770 1GB Radeon HD 7770
Manufacturer AMD AMD
Year January 2011 February 2012
Code Name Juniper XT Cape Verde XT
Memory 1024 MB 1024 MB
Core Speed 900 MHz 1000 MHz
Memory Speed 4200 MHz 4500 MHz
Power (Max TDP) 108 watts 80 watts
Bandwidth 67200 MB/sec 72000 MB/sec
Texel Rate 36000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 800 640
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 1040 million 1500 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 6770 1GB

Amazon.com

Radeon HD 7770

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

5 Responses to “Radeon HD 6770 1GB vs Radeon HD 7770”
Viking2121 says:

Wonder if I can flash the 6770 to the 7770, Flashed a 5770 to a 6770, might be possible

Anonymous says:

Try it Viking2121, I dare you.

Anonymous says:

U9DTSARDTSXRDTGSDUGDS8YAY8UIJKAIUSAG SYUASDSGYDSYGDGYDSTUDSUTASTUAS67AST6SA67 TAS 87AS7YSYUSIUAouaIUOauioaoaUHYAOIiOUIOzuyazi8u99a

Anonymous says:

U9DTSARDTSXRDTGSDUGDS8YAY8UIJKAIUSAG SYUASDSGYDSYGDGYDSTUDSUTASTUAS67AST6SA67 TAS 87AS7YSYUSIUAouaIUOauioaoaUHYAOIiOUIOzuyazi8u99a

devid says:

seems legit , only ~9% difference...

and 7770 is about the same as GTX 460, of course in game benchmarks.
so i guess its not bad card...

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