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Thread Starter 
Hi There, Need some help please

I'm running.....Intel i7 3820 @ 4.3Ghz
Win 7 Home Premium
OCZ Vertex 4 256Gb
Rampage 4 Extreme - 16 Gig Corsair Vengeance 4x4 Gb @ 2133 Mhz
Gigabyte HD 7950 x 2 CF
Corsair h80
Corsair TX 850M - PSU
WD caviar black 2T
Bitfenix fan controller
Obsidian 550d - case

when i overclock 1 card, Using MSI Afterburner, no problem getting 1100/1575 stable with only 1.120v and +5% power.
My problem comes in when i want to overclock in CF. I cant even get a stable 1025/1425 OC. Even going as high as 1.280v and +20% power. I did Disable ULPS.
Anything over 1000Mhz just crashes.
My only idea i have is that maybe my 850w PSU might not be enough.