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Radeon HD 3690/3830 vs Radeon HD 6770 1GB

Intro

The Radeon HD 3690/3830 has clock speeds of 668 MHz on the GPU, and 828 MHz on the 256 MB of GDDR3 RAM. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 Rasterization Operator Units.

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

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3690/3830 75 Watts
Radeon HD 6770 1GB 108 Watts
Difference: 33 Watts (44%)

Memory Bandwidth

In theory, the Radeon HD 6770 1GB should perform much faster than the Radeon HD 3690/3830 overall. (explain)

Radeon HD 6770 1GB 67200 MB/sec
Radeon HD 3690/3830 26496 MB/sec
Difference: 40704 (154%)

Texel Rate

The Radeon HD 6770 1GB is a lot (more or less 237%) faster with regards to texture filtering than the Radeon HD 3690/3830. (explain)

Radeon HD 6770 1GB 36000 Mtexels/sec
Radeon HD 3690/3830 10688 Mtexels/sec
Difference: 25312 (237%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6770 1GB is the winner, by a large margin. (explain)

Radeon HD 6770 1GB 14400 Mpixels/sec
Radeon HD 3690/3830 10688 Mpixels/sec
Difference: 3712 (35%)

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 3690/3830

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 3690/3830 Radeon HD 6770 1GB
Manufacturer AMD AMD
Year 2008 January 2011
Code Name RV670 PRO Juniper XT
Memory 256 MB 1024 MB
Core Speed 668 MHz 900 MHz
Memory Speed 1656 MHz 4200 MHz
Power (Max TDP) 75 watts 108 watts
Bandwidth 26496 MB/sec 67200 MB/sec
Texel Rate 10688 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 320(64x5) 800
Texture Mapping Units 16 40
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 128-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) 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: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3690/3830

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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