Сколько потребляет RADEON HD4670?

Потребляемая мощность ATI Radeon HD 4670 не более 60Вт.

ATI Radeon™ HD 4600 Series – System Requirements
ATI Radeon™ HD 4600 System Requirements
PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard
400 Watt or greater power supply (550 Watt for ATI CrossFireX™ technology in dual mode) is recommended
Certified power supplies are recommended. Refer to http://ati.amd.com/certifiedPSU for a list of Certified products
1GB of system memory recommended
Installation software requires CD-ROM drive
DVD playback requires DVD drive
Blu-ray™ playback requires Blu-ray drive and full 1080p display requires a 1080p-capable monitor
To enable dual mode ATI CrossFireX™ technology, a second ATI Radeon™ HD 4600 Series graphics card, an ATI CrossFireX Ready motherboard and one ATI CrossFireX Bridge Interconnect cable (included) is required.
Note: The ATI CrossFireX Bridge Interconnect cable is only required for ATI Radeon HD 4600 Graphics cards with hardware enabled ATI CrossFireX technology.

ATI Radeon™ HD graphics chips have numerous features integrated into the processor itself (e.g., HDCP, HDMI, etc.). Third parties manufacturing products based on, or incorporating ATI Radeon HD graphics chips, may choose to enable some or all of these features. If a particular feature is important to you, please inquire of the manufacturer if a particular product supports this feature. In addition, some features or technologies may require you to purchase additional components in order to make full use of them (e.g. a Blu-Ray or HD-DVD drive, HDCP-ready monitor, etc.).

©2009 Advanced Micro Devices, Inc.

Должен потянуть.
А вообще, это зависит и от остальной начинки.

если на нем ничего сильного больше нет (куча винчестеров и вентиляторов) , то потянет!

да. у меня 9800 ГТ, она конкурент 4850 радеона. эта видяха требует 450Вт. 400 точно хватит для 4670