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Radeon HD 3850 1GB vs Radeon HD 6670 (OEM) 1GB


The Radeon HD 3850 1GB comes with a GPU clock speed of 668 MHz, and the 1024 MB of GDDR3 memory is set to run at 828 MHz through a 256-bit bus. It also features 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

Compare those specifications to the Radeon HD 6670 (OEM) 1GB, which features a core clock speed of 800 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It is comprised of 480 SPUs, 24 TAUs, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB 63 Watts
Radeon HD 3850 1GB 75 Watts
Difference: 12 Watts (19%)

Memory Bandwidth

In theory, the Radeon HD 6670 (OEM) 1GB should be a lot faster than the Radeon HD 3850 1GB in general. (explain)

Radeon HD 6670 (OEM) 1GB 64000 MB/sec
Radeon HD 3850 1GB 52992 MB/sec
Difference: 11008 (21%)

Texel Rate

The Radeon HD 6670 (OEM) 1GB is much (about 80%) more effective at anisotropic filtering than the Radeon HD 3850 1GB. (explain)

Radeon HD 6670 (OEM) 1GB 19200 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 8512 (80%)

Pixel Rate

The Radeon HD 3850 1GB should be a lot (approximately 67%) more effective at full screen anti-aliasing than the Radeon HD 6670 (OEM) 1GB, and also capable of handling higher screen resolutions better. (explain)

Radeon HD 3850 1GB 10688 Mpixels/sec
Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
Difference: 4288 (67%)

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 1GB

Radeon HD 6670 (OEM) 1GB

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.


Display Specifications

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Model Radeon HD 3850 1GB Radeon HD 6670 (OEM) 1GB
Manufacturer AMD AMD
Year Nov 19, 2007 February 2011
Code Name RV670 PRO Turks
Memory 1024 MB 1024 MB
Core Speed 668 MHz 800 MHz
Memory Speed 1656 MHz 4000 MHz
Power (Max TDP) 75 watts 63 watts
Bandwidth 52992 MB/sec 64000 MB/sec
Texel Rate 10688 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 6400 Mpixels/sec
Unified Shaders 320(64x5) 480
Texture Mapping Units 16 24
Render Output Units 16 8
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 715 million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.


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