Radeon 4830 with a 350w psu?

Hello all,

I havent upgraded anything in my comp in a while, but my 7600 gt just died so I'm looking for a replacement. I've been looking at both the radeon 4670 and the 4830 and would really like to go with the 4830. However, my big concern is the fact that I have a relatively old (probably 2 years old now, I think) psu that was cheap and is only 350w. From everything I've read about the 4670 the power consumption on it seems quite low so I wouldn't have a problem with that one. It's been a little more difficult for me to find solid info regarding the 4830. If I can run it without upgrading my psu then I'll get it, but if not I'd rather settle for the 4670.

My specs:
pentium e2160 dual core 1800mhz
ecs p4m900-t motherboard
2gb ddr2 ram (2 1gb sticks)
two 7200rpm ide drives
dvd-rw

aside from that there's nothing else worth listing; no pci cards, no special fans or coolers, no power hungry usb devices, no overclocking. Will a 4830 work fine with this setup or will power be a problem for it?

Oh, and one more semi-related question: If I don't really play a lot of cutting edge games, never run higher than 1440x900 and don't particularly care too much about AA would there be any reason to get a 1gb card instead of a 512mb?

Thanks

True, but it also says that the 4670 requires a minimum of 400w, but I've seen plenty of people who say it runs just fine on their 350w and even 300w PSUs. Has anyone here tried a 4830 with a 350w power supply?

Also, I just checked and found out my PSU is a Rosewill 8360btx.

Ok so the more I look into this and see these replies the more I realize the 4830 seems out of the question... Now I'm starting to wonder is the 4670 will even work. On +12v1 its 10a and +12v2 its 13a.