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Radeon HD 6670 (OEM) vs Radeon HD 6770 1GB


The Radeon HD 6670 (OEM) makes use of a 40 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM runs at a frequency of 1000 MHz on this specific model. It features 480 SPUs along with 24 Texture Address Units and 8 ROPs.

Compare all of that to the Radeon HD 6770 1GB, which has a core clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is made up of 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 63 Watts
Radeon HD 6770 1GB 108 Watts
Difference: 45 Watts (71%)

Memory Bandwidth

The Radeon HD 6770 1GB should theoretically be a little bit faster than the Radeon HD 6670 (OEM) in general. (explain)

Radeon HD 6770 1GB 67200 MB/sec
Radeon HD 6670 (OEM) 64000 MB/sec
Difference: 3200 (5%)

Texel Rate

The Radeon HD 6770 1GB is much (more or less 88%) better at AF than the Radeon HD 6670 (OEM). (explain)

Radeon HD 6770 1GB 36000 Mtexels/sec
Radeon HD 6670 (OEM) 19200 Mtexels/sec
Difference: 16800 (88%)

Pixel Rate

The Radeon HD 6770 1GB should be a lot (approximately 125%) more effective at AA than the Radeon HD 6670 (OEM), and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 6770 1GB 14400 Mpixels/sec
Radeon HD 6670 (OEM) 6400 Mpixels/sec
Difference: 8000 (125%)

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 6670 (OEM)

Radeon HD 6770 1GB

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 6670 (OEM) Radeon HD 6770 1GB
Manufacturer AMD AMD
Year February 2011 January 2011
Code Name Turks Juniper XT
Memory 512 MB 1024 MB
Core Speed 800 MHz 900 MHz
Memory Speed 4000 MHz 4200 MHz
Power (Max TDP) 63 watts 108 watts
Bandwidth 64000 MB/sec 67200 MB/sec
Texel Rate 19200 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 6400 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 480 800
Texture Mapping Units 24 40
Render Output Units 8 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 715 million 1040 million
Bus PCIe 2.1 x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 can be processed per 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 higher 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 the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.


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