nvidia sentinel

alright well i just started playing halflife2 episode 1 and it keeps on crashing on me. my system specs are in my sig but i might as well make note of them again.

opteron165 dual core @ 1.9ghz
ecs kn1 extreme sli
ocz performance ram @ 213mhz
6600gt's in sli
1xraptor 10k hard drive
1xmaxtor 250gb sata drive
1xsamsun dvd burner
wireless card
creative audigy 2
550W antec truepower

now the sentinel keeps on saying that my 6600gt's are not getting sufficient power. could it be time for me to upgrade my psu or should i maybe start overclocking the 6600gt's?? please give me some input guys.

new psu time.

Check the rails of the PSU with a DMM while stressing (dual priming, etc). Also, do the 6600GTs require a PCI-Express power connector? If they do, check and see if one is loose.

well i dont have a meter to check the rails, and no the 6600gt's dont have a seperate power connector.