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Radeon HD 3690/3830 vs Radeon HD 4670 512MB

Intro

The Radeon HD 3690/3830 features a clock frequency of 668 MHz and a GDDR3 memory speed of 828 MHz. It also uses a 128-bit memory bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 4670 512MB, which comes with GPU core speed of 750 MHz, and 512 MB of GDDR4/GDDR3/DDR3/DDR2 memory running at 1000 MHz through a 128-bit bus. It also is made up of 320(64x5) SPUs, 32 Texture Address Units, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB 70 Watts
Radeon HD 3690/3830 75 Watts
Difference: 5 Watts (7%)

Memory Bandwidth

In theory, the Radeon HD 4670 512MB should be 21% faster than the Radeon HD 3690/3830 overall, because of its higher data rate. (explain)

Radeon HD 4670 512MB 32000 MB/sec
Radeon HD 3690/3830 26496 MB/sec
Difference: 5504 (21%)

Texel Rate

The Radeon HD 4670 512MB is much (more or less 125%) more effective at texture filtering than the Radeon HD 3690/3830. (explain)

Radeon HD 4670 512MB 24000 Mtexels/sec
Radeon HD 3690/3830 10688 Mtexels/sec
Difference: 13312 (125%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 3690/3830 is the winner, by a large margin. (explain)

Radeon HD 3690/3830 10688 Mpixels/sec
Radeon HD 4670 512MB 6000 Mpixels/sec
Difference: 4688 (78%)

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 4670 512MB

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 4670 512MB
Manufacturer AMD AMD
Year 2008 Sep 10, 2008
Code Name RV670 PRO RV730 XT
Memory 256 MB 512 MB
Core Speed 668 MHz 750 MHz
Memory Speed 1656 MHz 2000 MHz
Power (Max TDP) 75 watts 70 watts
Bandwidth 26496 MB/sec 32000 MB/sec
Texel Rate 10688 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 6000 Mpixels/sec
Unified Shaders 320(64x5) 320(64x5)
Texture Mapping Units 16 32
Render Output Units 16 8
Bus Type GDDR3 GDDR4/GDDR3/DDR3/DDR2
Bus Width 128-bit 128-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million 514 million
Bus PCIe 2.0 x16 PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the 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 number of pixels that the graphics card can 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 ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3690/3830

Amazon.com

Check prices at:

Radeon HD 4670 512MB

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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