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Radeon HD 3690/3830 vs Radeon HD 6750

Intro

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

Compare that to the Radeon HD 6750, which makes use of a 40 nm design. AMD has clocked the core speed at 725 MHz. The GDDR5 RAM runs at a frequency of 1000 MHz on this particular model. It features 720 SPUs along with 36 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 6750 86 Watts
Difference: 11 Watts (15%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6750 should theoretically be a lot superior to the Radeon HD 3690/3830 in general. (explain)

Radeon HD 6750 64000 MB/sec
Radeon HD 3690/3830 26496 MB/sec
Difference: 37504 (142%)

Texel Rate

The Radeon HD 6750 should be a lot (more or less 144%) better at anisotropic filtering than the Radeon HD 3690/3830. (explain)

Radeon HD 6750 26100 Mtexels/sec
Radeon HD 3690/3830 10688 Mtexels/sec
Difference: 15412 (144%)

Pixel Rate

The Radeon HD 6750 will be a small bit (approximately 9%) better at full screen anti-aliasing than the Radeon HD 3690/3830, and also should be capable of handling higher resolutions more effectively. (explain)

Radeon HD 6750 11600 Mpixels/sec
Radeon HD 3690/3830 10688 Mpixels/sec
Difference: 912 (9%)

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 6750

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 6750
Manufacturer AMD AMD
Year 2008 January 2011
Code Name RV670 PRO Juniper Pro
Memory 256 MB 512 MB
Core Speed 668 MHz 725 MHz
Memory Speed 1656 MHz 4000 MHz
Power (Max TDP) 75 watts 86 watts
Bandwidth 26496 MB/sec 64000 MB/sec
Texel Rate 10688 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 320(64x5) 720
Texture Mapping Units 16 36
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 4.0

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, it should 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the graphics 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 maximum amount of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many 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 6750

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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