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

Intro

The Radeon HD 6670 (OEM) features a GPU clock speed of 800 MHz, and the 512 MB of GDDR5 memory is set to run at 1000 MHz through a 128-bit bus. It also is made up of 480 Stream Processors, 24 TAUs, and 8 ROPs.

Compare that to the Radeon HD 6770 1GB, which has core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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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 just a 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 should be a lot (approximately 88%) faster with regards to anisotropic 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

If running with lots of anti-aliasing is important to you, then the Radeon HD 6770 1GB is superior to the Radeon HD 6670 (OEM), by a large margin. (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: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

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