Power Supply

I have been using Sapphire Radeon X1650Pro PCI Express with Thermaltake TR2 420W power supply without having any problem. Recently have bought ATI Radeon HD 4850 but havent install it yet. Because the minimum requirement of power supply of this card is 450W.

Now my question is, if I use my 420W power supply for ATI Radeon HD 4850 PCI Express what probably can happen? is 30W Power shortage too much for the card? I dont have enough money to buy a new 450W power supply.

My PC Config is as following:

Processor: Intel Pentium 4HT 3.0 GHz
Motherboard: Intel DG965RY
HDD: 160GB
PCI Express: Sapphire Radeon X4650 PRO
Power Supply: Thermaltake TR2 420W

Can i use the ATI Radeon HD 4850 PCI Express with my existing power supply?

I have seen in nVIDIA website that nVIDIA 8800GT takes maximum power of 105W. What is the maximum power that the ATI Radeon HD 4850 takes?
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  1. Welcome to the forums!

    Please read this review.

    The main problem with this power supply is that it can’t deliver its labeled power. It is, in fact, a 350 W power supply.


    ATI Radeon HD 4850 System Requirements

    450 Watt or greater power supply with 75 Watt 6-pin PCI Express® power connector recommended (550 Watt and two 6-pin connectors for ATI CrossFireX™ technology in dual mode)
    Certified power supplies are recommended. Refer to http://ati.amd.com/certifiedPSU for a list of Certified products.
  2. Radeon HD 4850 (512 MB)

    2D Desktop Watts (Socket)=122

    3D Full Load Watts (Socket)=237

    Cost in Dollars 365 Days x 8 Hours=138
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