Weird PSU issue

[SoundFrenzy]

I was looking into buying the evga CO 6800gs for Oblivion. Since at the moment i have a AOpen 5600. So I was wondering if i needed a new more powerful PSU. So, i looked at the eXtreme PSU CAlculator (http://www.extreme.outervision.com/index.jsp) , and lo and behold it said that i needed a more powerful PSU for the 5600 than the 6800gs (345 vs 335 watts). Now here's the catch, i'm currently running a 250 watt PSU, with no problems. Should i go for a new PSU, or am i safe with what i have?

Here's what else I have:

AMD Athlon 64 2800+ Newcastle overclocked to 2250 MHz
SoundBlaster Audigy
x4 USB devices
1024 Mb DDR Ram (3 sticks)
x1 Regular Fan
x1 LED Fan
x1 80g 7200rpm IDE harddrive
x1 DVD-ROM Drive
x1 CD-RW Drive
x1 Cold Cathode

 

[jj_mclure]

i bought an evga 6800gs and the booklet says you need a min 300 watt which is what i got. but i have a hunch you will be ok. especially if you were able to run the 5600.

here's what I got running a 300Watt

p4 3.0 prescott overclocked from 2.8
1 gig ram
evga 6800gs overclocked 390/1100
1 hdd 7200rpm
1 DVD

so, not a huge system

 

[SoundFrenzy]

I was looking at the factory overclocked (CO) evga 6800gs, do you think this requred more wattage than a regular 6800gs? And if i unlock/overclock some more will it require even more wattage than the standard 6800gs?

 

[jj_mclure]

i looked at a website I forgot where but I looked at how much extra wattage an overclocked cpu and video card need. it reall ywasn't alot more then stock.

for a video card overclocked I think the wattage went up like 5 Watts depending on the overclock. i dont think it is significant