Sudden CPU max load

Morning Everyone,

After a 5-6 month break from multiboxing WoW I decided to return to level the rest of my guys. So I go to start my rig up and no power to the mobo- great. After messing with it I decided my psu was dead and confirmed by hooking up a smaller psu to it and it works. So I have switched to my little back-up PC, which I made solely to play on "in case of emergency."

Back-Up PC Specs:
AsRock Mobo (I can find the model when I get off work but I don't think it's a mobo issue)
I5-3570K CPU
MSI Twin Frozr 560TI 1GB
Corsair Vengeance DDR3 1600 16Gb (8x2)
Samsung 840 SSD 120GB Game Drive
Samsung 840 SSD 120GB OS drive

So I switched to my old back-up, fresh installed windows 7, wow, and isboxer suite. Loaded everything up and leveled my monk team from 84 to 85, with no issues, and took them to Jade Forest. Got about 20% through the area and then my problems started- and this is where I'm asking for help at.

On the "Acid Rain" quest- where you fly a mini chopper around and bomb two types of monkeys- suddenly all my clients began to slow to where they were unplayable. Odd I thought since I had been playing for several hours with no issues. My clients had been running at 30fps main and 15fps on the slaves- I keep all my fps down while leveling especially on this lesser powerful machine. Now I was getting 1-7 fps on all clients.

So I reloaded isboxer and started the team again. Everything loaded without issue but after logging in- same issue. Checked all my drivers, specifically gpu, and all are up to date. So I finally loaded HWMonitor, and I am showing 100% load across all cores at stock speed and <30% max load on GPU. Lightbulb moment- my main computer is overclocked and I had yet to OC this one.

Reloaded a stable 4.2 Ghz profile and ran quick burn test to confirm- quick enough to at least confirm it should be able to run the 5 clients and test this "issue". Opened isboxer and launched the team. At load screen 30fps/15fps like it should, load on CPU showing about 20% all cores. Loaded first client with no changes to fps/performance. Same thing with second client. On the third client, fps drops again to about 7 across the board. HWMonitor showing almost 100% load across all cores. Load the final 2 clients, all fps down to 1 now and CPU load 100% on all cores.

Time to check Add-Ons. Killed ALL add-ons and problem continues. Time to mess with my isboxer profile. Disabled swapping/ instant swapping. Problem persists. Checked each client individually- all now running at lowest settings and using dX9. Problem persists. Unchecked dx9 in game. No change. Tried changing monitor layout (I'm using a single monitor for reference) several times. No change in issue. Changed CPU strategy in isboxer. Tried all 5, iirc, settings and no change. Still unplayable. Re-installed wow and isboxer. Reconfigured team and launched. Logged in and same issue, full CPU load. Switched to different team- mixed team resting in Org- same result.

So what am I overlooking or missing? Why after about 3 hours of playing without issue did this suddenly happen? For reference, I did not have HWMonitor open when it was running smoothly so I can not for sure say it jumped from XX% load to now 100%. I don't recall the specific number but the load on my memory was still quite low when the CPU load was maxed out.

I believe even this slower machine should be able to run 5 clients without issue, and for several hours I was correct. But now this has happened and I'm just not technically minded enough to figure this out on my own so now I turn to my smarter boxer brethren for help. Any assistance would be greatly appreciated.

Are you also having any visible issues with your name plates? There was a nasty fps bug that dropped with 5.4 that can be cured with this:

/run SetCVar("raidFramesDisplayIncomingHeals",1)

Thanks luxlunae,
I did try that and the problem continued.

Ended up reflashing the BIOS and it seems to have fixed it. At least I can play now.