Greetings,
You did perform a fresh install of the OS on the new hardware right? I hesitated to ask this because of the enormity of change. I know you said you haven't re-installed, but that's vague and I want to be clear. If a fresh install was performed, please proceed below.
Review the System Event Viewer... are there any entries relating to the Waicom Tablet or USB? Check under both Application and System headings. I was going to ask if you had anything externally connected earlier, but believed reviewing the event logs would bring to light any issues. What happens if you disconnect the tablet, does the BSOD cease?
I'd still test my memory for a brief period of time. While the error doesn't indicate memory, it's better to be thorough.
There are benefits to using a brand name PSU. Known quality of components, higher reliability, often Active PFC, Typical 80+ or > efficiency. Reliable (stable) amperage & power delivery across all rails. Lower quality "knockoffs" often cut corners that can result in instability, fluctuation and premature failure. That said the CX430 is a decent PSU. Certainly better than a no-name knockoff. While its not enthusiast grade, I have put many as replacements into less demanding systems. The chart I provided above is AMD recommend power supplies. I don't think there were any below 600w recommended. I can however from experience say that a 430w PSU of known quality is enough to run your rig. I looked at 3 different 6670's on Sapphires website. Their minimum stated is 400w. Lets confirm the above items before you purchase.