Going From 3GB RAM to 8GB RAM HELP!

OK well I already know the ram that I need now and I have upgraded to 64-bit already the only thing now is the graphics card. Someone said my pc may not have enough power? It says it runs on 300 watts. would that be enough to run this card?
Galaxy - NVIDIA GeForce 9400 GT 512MB DDR2 PCI Express Graphics Card - BB94GFE8HDFEXX
300 watts with the geoforce will be pushing it!
There are several excellent threads set up on this board that will send you to sites where you can plug in your system specs and it will calculate your power usage. I recommend you seek 1 out before you buy and use.
Regards,
Adrian
 

My Computer My Computer

At a glance

Windows 7 7600 1 X64AMD PHENOM II X 550 PROCESSOR 3.1 ghzCorsair 4 gig ddr 3ati radeon 3300
Computer Manufacturer/Model Number
Custom Build
OS
Windows 7 7600 1 X64
CPU
AMD PHENOM II X 550 PROCESSOR 3.1 ghz
Motherboard
ASUS M4A78-TE
Memory
Corsair 4 gig ddr 3
Graphics Card(s)
ati radeon 3300
Sound Card
ati hd
Monitor(s) Displays
syncmaster 2033sw
Screen Resolution
1600X900 60 hz refresh
Hard Drives
twin_seagates SATA's 1 TB & 500 Gig, hitachi_slimline 160 gig
PSU
antec_550 watt
Case
cooler master GLite
Cooling
stock_heat sink
Internet Speed
20mbs up/ 1.5mbs down
Other Info
favorite child "stewie"
favorite dog "brian"
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