QPI frequency and mouse lag?

[hyrule4927]

Hello everyone, got a quick overclocking question. Just got my i3-530 stable at 4.4 GHz, but I've run into one little, very odd issue. My QPI frequency is only at 2.8 GHz (had the multiplier turned down), but increasing it causes major mouse lag. Lower frequencies are just fine, at 2.8 GHz it's intermittent and pretty minor, but at any higher QPI multipliers my mouse is essentially unusable. I'd like to push this a little considering it's barely above stock speed and way below my core speed. If nothing else, I'd like to alleviate the current level of mouse lag by some means other than lowering QPI below the stock speed. Is it possible my USB ports (it's a USB wireless mouse, had the same problem with a different wireless mouse and receiver, I'll test a wired mouse once I can borrow one) are somehow not getting enough power? Any other ideas and advice are welcome.

Here is my system for reference:

i3-530 @ 4.4 GHz
ASRock H55DE3 Motherboard
Integrated Graphics
8GB Ripjaw X DDR3-1600
20GB Seagate HDD
Corsair CX430 V2 PSU

One last question. Under max stress with Prime 95 at my current clocks, both cores are sitting around 60C max. Considering that T_case is around 73C, should this be a safe temperature for near 24/7 folding, or should I drop the clocks a bit? As a reference, with a lighter overclock, around 3.7 GHz, my temperatures generally stay below 45C.

 

[soccerballtux]

how is stability at higher qpi? IE, Prime95 stress test etc?

Temps are fine.