We can't really tell much from that screenshot other than your FSB is 400. You need to provide us with memory settings, because that is likely to be your upcoming wall, if not the motherboard's FSB wall. I assume since you have 5-5-5-12 DDR2 800 you are on a 1:1 memory timing, because if you were on 5/4 we would have some real issues because that would be DDR2 1000, and with your RAM I am not sure I see that happening. You may get 850 out of them, 900 if your are lucky. So, I am
guessing you can get 3.75 out of it , maybe. That would be pushing the FSB another 15MHz or so and thats when you start running into walls (410 area). If you hit a wall don't be disappointed, you hit 3.6 on air
Nb vcore = Northbridge voltage
CPU core = CPU voltage
Just guessing, haven't seen an Intel based rig's bios is a long time lol.