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Radeon HD 4770 vs Radeon HD 6770 1GB

Intro

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

Compare all of that to the Radeon HD 6770 1GB, which features clock 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.

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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

Theoretically speaking, the Radeon HD 6770 1GB should perform quite a bit faster than the Radeon HD 4770 in general. (explain)

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

Texel Rate

The Radeon HD 6770 1GB is much (approximately 50%) more effective at AF than the Radeon HD 4770. (explain)

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

Pixel Rate

The Radeon HD 6770 1GB will be a little bit (more or less 20%) faster with regards to anti-aliasing than the Radeon HD 4770, and also will be capable of handling higher resolutions while still performing well. (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

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.

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 max amount of data (measured in MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

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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