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.
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.