THAT IS WHAT I SAID NOT TO DO!
The CPU cores all set to that height will majorly overheat your device,and might kill it.
The most you should do is use Kernel Tuner to set the minimal speeds up to something around 50% full.
I reccommend either leaving it at the default or setting it around the 500 range.
Leave the CPU Govern alone,but GPU on performance mode with Trickster Mod is fine.
The Kernel Tuner's 32bit option does not negatively effect the performance enough (if at all),so you can keep it on with no problems.
The framerate of PPSSPP is dependant on what settings are used.
I have almost everything enabled and I get fluid 60fps with DBZ Budokai Shin.
I also get a nearly stutterless fps with SRB2PSP which normally runs abysmal on the actual system.
My PPSSPP settings...
Graphics:Non buffered,frame limit unchecked with 50% alternative speed,all of performance enabled, and the two speedup hacks enabled.
System:Multithreading and I/O disabled with native 330Mhz PSP clock speed on 2000/3000 mode.
A majority of games will have visual issues (Simpsons Game 3D graphics broken [I blame Qualcomm]) while the two I have tested (DBZ Shin and the SRB2PSP homebrew/port) work nearly flawlessly at full rates.
The 50% alternative rate is really helpful for better performance,since the game still goes up to full speed.