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


Intro

The Radeon HD 3850 1GB uses a 55 nm design. AMD has clocked the core frequency at 668 MHz. The GDDR3 RAM runs at a frequency of 828 MHz on this model. It features 320(64x5) SPUs along with 16 TAUs and 16 ROPs.

Compare all that to the Radeon HD 6670 (OEM) 1GB, which has a core clock speed of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 128-bit memory bus, and uses a 40 nm design. It is made up 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

The Radeon HD 6670 (OEM) 1GB, in theory, should perform much faster than the Radeon HD 3850 1GB overall. (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 will be a lot (approximately 80%) more effective at texture 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

If running with high levels of AA is important to you, then the Radeon HD 3850 1GB is a better choice, by a large margin. (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

Amazon.com

Radeon HD 6670 (OEM) 1GB

Amazon.com

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 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 maximum amount of data (counted in megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics 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 chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3850 1GB

Amazon.com

Radeon HD 6670 (OEM) 1GB

Amazon.com

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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