Given that your cpu is at idle I would consider those temps to be too high, check your cooler mount / Thermal paste application / case airflow. What are the temps under load? (Prime95 Blend Test)
Linked NB/SB voltages? mmmmm, first time I've encountered that, usually they're seperate.
That said, 1.264V on the NB seems low to me for a Quad
CPU VTT (FSB Voltage) is a little high, I'm using 1.15V for mine
Your cpu should be able to go to 1.3625V OK, rule of thumb is not to exceed 1.4V on air cooling, as always, keep a close eye on your temps.
Originally Posted by Luke2
And could I raise the Chipset/FSB/DDR some more ? If yes, which ?
(NB/SB) probably, you need to keep a close eye on the temps if you do, I would try and stay under 1.5V if temps are OK (without specialised cooling)
(CPU VTT) Probably not, it would be better to try and reduce this as above.
VDIMM, according to your CPU-Z screen dump you're already exceeding the XMP Profile voltage for 400MHz at 4-4-4-12 timings, you should not have to do that, reduce it to a maximum of 2.1V
Before continuing - Reduce your cpu temps