Not enough power?

hey guys

i think i might have pin point the problem. i think is my power supply not giving enough power

here is my specs first:

phenom II x4 955
asus m4a78t-e
two radeon 4850 crossfired with one bridge
4ghz ram
heat sink and fan
5 x 120mm led fans
1 x 200mm fan no led
antec 650w earthwatt

so the problem. my computer freezes in different time during game play (team fortress 2 and left 4 dead). i have done a stress test on the video card for more than 30min no problem there. done all my updates (bios, video card, directx). played tf2 in window mode with everything set to low setting and after 30min no freezes. and i tried two out some of the fans (2 of them) and it lasted a little bit longer.

so i think it is the power supply that is not enough for my set up

let me know what you think thanks!!!

that sound good but the problem is i don't know how to do that...

can you please give me some steps

here is my ram ocz platinum 2x2gb 240pin ddr3 1600 pc3 12800

so what i did was i went to bios and changed my voltage but didn't change my timings and i could start my computer...does that mean it can't handle 1.9v???

so i tried to setting it to 1.85v and timing to 7-7-7-24 and the system craps out right away. Could this mean PSU is not enough power?


does anyone know if my 650w psu is enough to run my system? or is it tight?

well i have two 4850....could it be that???

i just found out that my ram was not running at the factory setting....so i just changed it...maybe it is b/c of that???

my ram was running at 533mhz with 1.6v and factory setting is at 1.9v 800mhz

that psu is plenty.
+1 on the ram give it some more juice and play with the latancys