DO NOT use Throttlestop. Not until you have the CPU fully stable. Personally I'd be very wary of it even then. And please also ensure that Afterburner is doing nothing either. It's really vital that the CPU is allowed to run at stock voltages/frequencies - excepting the Intel Speedstep adjustments of course. Overclocking/undervolting/tweaking any CPU are all potential BSOD triggers.
The thing with troubleshooting is to only ever change one thing at a time. If you'd feel more comfortable disabling the C-States then by all means try that first. Then let the PC run for a while to confirm whether the BSODs really have stopped. If it does still BSOD then disable intelppm.sys and see how it goes in that state.
You need to be systematic and disciplined when troubleshooting. One step at a time.
