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Radeon HD 3850 256MB vs Radeon HD 6750 1GB

Intro

The Radeon HD 3850 256MB comes with core 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 TAUs and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 6750 1GB, which features clock speeds of 725 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 720 SPUs as well as 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

Theoretically speaking, the Radeon HD 6750 1GB will be 21% quicker than the Radeon HD 3850 256MB in general, because of its greater bandwidth. (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 is much (about 144%) better at texture filtering 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

If using high levels of AA is important to you, then the Radeon HD 6750 1GB is a better choice, but not by far. (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: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

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