780 SLI - "Voltage Limit" and "Utilization Limit" Flags

Hello,
I'm trying to pinpoint an issue I'm having with my video cards, and wanted additional advice before I make purchases. My questions will be: is there anything else I should try? Is there anything I can do to pinpoint the problem?
My setup:
Core i7-950 - OC'd to 3.84 ghz
ASUS P6X58D-E - mobo
2x MSI n780 TF in SLI
Corsair 850AX Power Supply
Also drawing power: 5x Hard Drives; Typically only 2 are running at one time (OS RAID), the other 2 are a backup RAID I only use to archive stuff, and the last is a Linux drive that Windows doesn't even see
Issue:
Most games run without issue; but Metro Last Light is unstable. I run at 1920x1080, Advanced Physx, 2x AA, Very High quality and Very High Tessalation. There are times when I get 60 FPS (V-Sync); however, there are times that the performance drops to 6 or 14 FPS. When it is at 14 FPS it is still playable, but 6 FPS is terrible. I use Afterburner's OSD to monitor GPU Usage, Temp, and FPS. When it is at 6 FPS, it is only using 12% of either GPU at most.
While investigating, I noticed a few things in Afterburner that stand out when this occurs.
1) The Core Clock drops down (throttling?)
2) The "Voltage Limit" and "Utilization Limit" flags are both set on both GPUs.
My thoughts:
I'm thinking that my Power Supply isn't quite big enough. I thought this may become an issue when I first bought the two cards (I was previously running 2 460's on SLI, then upgraded to 780s).
My question is if the video cards are pulling the power supply's limit - will this trip the two flags? I would have thought the Voltage Limit would indicate the voltage going too high; but power supply being strained should drop voltage.
I have not changed any of the voltage settings to the card - they are whatever MSI has them set to for the stock OC.
If I buy another PSU, I don't like to go cheap - so it will definitely be beefy. Before I drop a few hundred on it, I want to be sure the Power Supply is the issue. Is there anything else you guys/gals can think of that may be an issue? Any tests I can do to confirm?
The new Thief seems to run fine; also Kombustor runs without issue (but only runs on one GPU - does not SLI). I have no other stability issues - the PC doesn't randomly shut down or reboot. It just seems to be Metro Last Light - but Metro is also the most demanding game that I own.
Any assistance or feedback will be greatly appreciated!
Edit - Update:
I tried disabling SLI to see if the issue would improve by only loading 1 GPU. No difference at all - no better or worse. Same flag (just only on the one GPU), same exact FPS 6.4.
I installed GPU-Z to be able to monitor core voltage. It normally runs at about 1.1 volts. However, once the issue occurs it is as low as 0.875 volts. Seems to confirm the PSU may be an issue. Any feedback or additional confirmation is still greatly appreciated!

Apologize for the bump - I could not see a way to edit the original post. However, I wanted to make sure this information is available in case others had similar issues.
I found an even better solution. NVIDIA has an updated "Physx" driver - you have to download it from the NVIDIA site (i.e. Other NVIDIA drivers, not GeForce). Look for Physx version 9.13.1220 or later. 9.13.1220 was release on 1/27/2014 - but an older version is included in the most recent GeForce drivers for some reason.
The patch notes from Physx 9.13.1220 specifically state:
*Changes & fixed issues in this release
**Fixes a bug that caused the Metro Last Light to not be GPU accelerated on some systems.
With this software update I can enable Advanced Physx and max settings in Last Light and still run at 60 FPS.

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