Upgrading a video card need technical help.

right now i have a 300 watt PSU and running a geforce 7300LE. and im thinking to upgrade to the 4650/4670. do you think it would be safe if i upgraded to the 4650/4670 with my PSU? will it have no drawbacks or will their be a risk?Upgrading a video card need technical help.
It won't. 4850:[quote=''ATI'']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%26trade; technology in dual mode)[/quote] 4870[quote=''ATI'']500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX%26trade; technology in dual mode)[/quote]Upgrading a video card need technical help.
[QUOTE=''MonsieurX'']It won't. 4850:[quote=''ATI'']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)[/quote] 4870[quote=''ATI'']500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in dual mode)[/quote][/QUOTE]

i said the 4670/4650 not the 4870/4850.
anyone?
i just read that the amps required is more important the watts required. if my PSU has 18 amps ( i think) would that be enough to run the the 4650? how many amps does the 4650 have?
Sorry,misread.
4670 will work fine
[QUOTE=''bungie93'']4670 will work fine[/QUOTE]

can you please provide proof because im very skeptical about this card and i know if i mess something up ill never hear the end of it from my dad.
anyone?
I think this is what you are looking for guy.http://hothardware.com/Articles/ATI-Radeon-HD-4670-Redefining-The-Mainstream/?page=10Bottom line,it should work just fine.