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Radeon HD 3850 256MB vs Radeon HD 6750 1GB

Intro

The Radeon HD 3850 256MB has a clock speed of 668 MHz and a GDDR3 memory speed of 828 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It features 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

Compare that to the Radeon HD 6750 1GB, which has GPU core speed of 725 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also features 720 Stream Processors, 36 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 256MB 75 Watts
Radeon HD 6750 1GB 86 Watts
Difference: 11 Watts (15%)

Memory Bandwidth

In theory, the Radeon HD 6750 1GB should be 21% quicker than the Radeon HD 3850 256MB in general, because of its higher data rate. (explain)

Radeon HD 6750 1GB 64000 MB/sec
Radeon HD 3850 256MB 52992 MB/sec
Difference: 11008 (21%)

Texel Rate

The Radeon HD 6750 1GB will be much (about 144%) better at AF than the Radeon HD 3850 256MB. (explain)

Radeon HD 6750 1GB 26100 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 15412 (144%)

Pixel Rate

The Radeon HD 6750 1GB should be just a bit (about 9%) better at AA than the Radeon HD 3850 256MB, and able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 6750 1GB 11600 Mpixels/sec
Radeon HD 3850 256MB 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 3850 256MB

Amazon.com

Check prices at:

Radeon HD 6750 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 3850 256MB Radeon HD 6750 1GB
Manufacturer AMD AMD
Year Nov 19, 2007 January 2011
Code Name RV670 PRO Juniper Pro
Memory 256 MB 1024 MB
Core Speed 668 MHz 725 MHz
Memory Speed 1656 MHz 4000 MHz
Power (Max TDP) 75 watts 86 watts
Bandwidth 52992 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 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 1040 million
Bus PCIe 2.0 x16/AGP 8x PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses 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 amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total amount 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3850 256MB

Amazon.com

Check prices at:

Radeon HD 6750 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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