PLZ HELP: Can my power supply handle this?

[177ine177ine]

i brought a new case a while ago, and the crappy PSU it came with was sumfin i never had time to replace. It's a 420W power supply, but i'm gettin worried because my +12V rail only has 13.0A. MY current system is:
a8n-sli
6600gt
3500+amd64
160GB WD Sata
Floppy Drive
DVD drive
Wireless internet card
1 gig of ram (2X512)
using 1 GAMEPORT for a joystick

So far it's handled it pretty well and i havnt had any blowups. Also, it's only a 20 pin connector but people said if u just plug rite into the mobo it doesnt matter that the mobo is 24 pin, and its been working for bout a year now.
I plan to add a 74GB raptor, and two more 512MB RAM sticks, and i was wondering whether this wuld be too much for my PSU. Any help is appreciated
ALSO, I DONT OVERCLOCK
Thxs in advance

 

[MTLink]

I would recommend that you get a new one. Right now, it isn't blowing up or anything, which is good. But move on to anything better than a 6600GT and you will need one, for sure. Get one right now rather than waiting until you get a new graphics card and risking your computer going boom.