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


Intro

The Radeon HD 6670 (OEM) uses a 40 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 memory runs at a frequency of 1000 MHz on this model. It features 480 SPUs along with 24 TAUs and 8 ROPs.

Compare all that to the Radeon HD 6770 1GB, which makes use of a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM works at a speed of 1050 MHz on this specific model. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator 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

As far as performance goes, the Radeon HD 6770 1GB should in theory be a little bit better 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 will be a lot (approximately 88%) more effective at texture filtering 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 is a lot (about 125%) more effective at full screen anti-aliasing than the Radeon HD 6670 (OEM), and should be capable of handling higher resolutions more effectively. (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)

Amazon.com

Radeon HD 6770 1GB

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 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: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once 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 AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the video card could 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 Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 6670 (OEM)

Amazon.com

Radeon HD 6770 1GB

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.

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