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Radeon HD 3690/3830 vs Radeon HD 6770 1GB

Intro

The Radeon HD 3690/3830 has a GPU clock speed of 668 MHz, and the 256 MB of GDDR3 RAM runs at 828 MHz through a 128-bit bus. It also is made up of 320(64x5) Stream Processors, 16 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 6770 1GB, which has 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 3690/3830 75 Watts
Radeon HD 6770 1GB 108 Watts
Difference: 33 Watts (44%)

Memory Bandwidth

In theory, the Radeon HD 6770 1GB should be quite a bit 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 should be a lot (about 237%) faster with regards to anisotropic 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 running with lots of anti-aliasing is important to you, then the Radeon HD 6770 1GB is superior to the Radeon HD 3690/3830, by far. (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: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum 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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