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Radeon HD 4770 vs Radeon HD 6770 1GB

Intro

The Radeon HD 4770 features core clock speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs along with 32 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 6770 1GB, which uses a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 memory works at a speed of 1050 MHz on this specific model. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770 80 Watts
Radeon HD 6770 1GB 108 Watts
Difference: 28 Watts (35%)

Memory Bandwidth

In theory, the Radeon HD 6770 1GB is 31% faster than the Radeon HD 4770 overall, due to its greater bandwidth. (explain)

Radeon HD 6770 1GB 67200 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 16000 (31%)

Texel Rate

The Radeon HD 6770 1GB should be much (approximately 50%) faster with regards to texture filtering than the Radeon HD 4770. (explain)

Radeon HD 6770 1GB 36000 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 12000 (50%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6770 1GB is the winner, not by a very large margin though. (explain)

Radeon HD 6770 1GB 14400 Mpixels/sec
Radeon HD 4770 12000 Mpixels/sec
Difference: 2400 (20%)

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 4770

Amazon.com

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Radeon HD 6770 1GB

Amazon.com

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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 4770 Radeon HD 6770 1GB
Manufacturer AMD AMD
Year Apr 28, 2009 January 2011
Code Name RV740 Juniper XT
Memory 512 MB 1024 MB
Core Speed 750 MHz 900 MHz
Memory Speed 3200 MHz 4200 MHz
Power (Max TDP) 80 watts 108 watts
Bandwidth 51200 MB/sec 67200 MB/sec
Texel Rate 24000 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 640(128x5) 800
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 826 million 1040 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 4770

Amazon.com

Check prices at:

Radeon HD 6770 1GB

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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