Techiton

AMD's Radeon HD6570 and HD6670 are the entry-level graming graphics card launched in early 2011. The HD6570 comes in two main versions - DDR3 and the GDDR5 while the HD6670 is GDDR5. Codenamed Turks, they are the fastest graphics card today that do not require an external power source and they are also low profile cards which means they are perfect for HTPC or small CPU cases.
The specifications for both the cards are listed below.

AMD Radeon HD 6570 DDR3 Specifications:

Core Frequency	650 MHz
Memory Frequency	900 MHz
Memory Size	512 MB - 2 GB (DDR3)
Memory Bus Size	128 bit
Memory Bandwidth	28.8 GB/s
Stream Processors	480
TDP (Max Power)	44 W
Idle Power	10 W
Price	US$69

AMD Radeon HD 6570 GDDR5 Specifications:

Core Frequency	650 MHz
Memory Frequency	1000 MHz
Memory Size	512 MB - 1 GB (GDDR5)
Memory Bus Size	128 bit
Memory Bandwidth	64 GB/s
Stream Processors	480
TDP (Max Power)	60 W
Idle Power	11 W
Price	US$79

AMD Radeon HD 6670 GDDR5 Specifications:

Core Frequency	800 MHz
Memory Frequency	1000 MHz
Memory Size	512 MB - 1 GB (GDDR5)
Memory Bus Size	128 bit
Memory Bandwidth	64 GB/s
Stream Processors	480
TDP (Max Power)	66 W
Idle Power	12 W
Price	US$99

Source: AMD