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

Intro

The Radeon HD 6670 (OEM) 1GB comes with a core clock speed of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 128-bit memory bus, and uses a 40 nm design. It features 480 SPUs, 24 Texture Address Units, and 8 Raster Operation Units.

Compare those specifications to the Radeon HD 6770, which comes with GPU core speed of 900 MHz, and 512 MB of GDDR5 memory set to run at 1050 MHz through a 128-bit bus. It also is comprised 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) 1GB 63 Watts
Radeon HD 6770 108 Watts
Difference: 45 Watts (71%)

Memory Bandwidth

Theoretically, the Radeon HD 6770 should be a small bit faster than the Radeon HD 6670 (OEM) 1GB in general. (explain)

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

Texel Rate

The Radeon HD 6770 is quite a bit (more or less 88%) more effective at AF than the Radeon HD 6670 (OEM) 1GB. (explain)

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

Pixel Rate

The Radeon HD 6770 should be a lot (approximately 125%) faster with regards to full screen anti-aliasing than the Radeon HD 6670 (OEM) 1GB, and capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 6770 14400 Mpixels/sec
Radeon HD 6670 (OEM) 1GB 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) 1GB

Amazon.com

Check prices at:

Radeon HD 6770

Amazon.com

Check prices at:

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) 1GB Radeon HD 6770
Manufacturer AMD AMD
Year February 2011 January 2011
Code Name Turks Juniper XT
Memory 1024 MB 512 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 (in units of megabytes per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the 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 texture map elements (texels) that are applied in one second. This is worked out 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially 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) 1GB

Amazon.com

Check prices at:

Radeon HD 6770

Amazon.com

Check prices at:

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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