I dunno much about temps, so i thought I better ask:
Are these temps ok, and what are the limits?

CPU idle - 58ish C
CPU gaming - 65 C max
GPU idle - 70ish C
GPU gaming - 85 C max
System idle 40ish C
System gaming 45ish C

I am using nTune Monitor to get temps.
See sig for specs and overclock.

I probably should mention that the PC doesn't get good ventilation as it is between a sofa and a desk, which it is under, and about 2 inches/5 cm from the wall.

What cooler?

Those look pretty fine to me.

Its a thermaltake big typhoon or something like that.

Would it help if i got a cooler that had a fan perpendicular to the motherboard( blows the air out the exhaust fan at the back) , rather that a fan on my cooler?

I am also using an Antec P180 case

Just move to a place with better ventilation. As long as your temps don't go past 75C for the CPU, you're perfectly fine. You could possibly drop .05V off the VCore and see if that affects anything.

I can't move the PC unfortunately, but i will try lowering the VCore as you suggest. It's late though so I won't be able to do it till morning.

He is OC-ing the thing to 3.4G; I don't think he can do it.

You'd be surprised how low and stable a Core 2 can run.

Yep I lowered VCore to 1.375, and am going to try 1.35 next. I'll keep you posted

also should i do anything about the fsb voltage running at 1.4 V, and the pci e voltage also running at 1.4V?

I tried but the lowest stable VCore is 1.375

What should I do about the other voltages? My mobo auto raised them when I overclocked. I should probably mention that I overclocked in unlinked mode too

Here are all my voltages:

cpu - 1.375
memory - 2.1
fsb - 1.4
HT(SPP-MCP) - 1.2
PCI E - 1.4
nForce 1.5
AUX - 1.5

I am using NVIDIA MONITOR. is this a good app or should i use something else? I have no idea what the last to voltages mean, I don't think they are changeable.

Idle temps have lowered to:

CPU - 55 C
System - 37 C
GFX - 61 C

EDIT: I just found out that it may not be entirely stable at 1.3812, cell factor crashed.

Stable at 1.3875

Unfortunately, because of poor ventilation, my PC's temps, keep getting higher, so I have to switch it off for a while to get true readings.

Thanks for your help

I told you; 3.4G is a considerable OC and not even a Core2 can do it on such low voltages.

Hnn, leave the voltages where they are. Stability is paramount. What in the way of fans do you have in the system?

@M25
Just chill. .05V isn't exactly a stepping. And its actually worth a try.

I have my X2 4200+ on 1.350V (12H Prime stable) right now and if I drop it to 1.325V, it will freeze after about 10min of load; sometimes you can play a lot with the voltage, but other times, the margins are pretty narrow.

An thats what I was going for. At least some margin. I don't know what batch his chip is so I'll use what tricks I know to help. Thanks for the warnings anyways.

I have an antec p180 with the stock fans. the top fan is off, the side fan on low, and a thermaltake big typhoon cpu cooler

If these are your only case fans, you should have them both on, full revs, to keep a 3.4GHz Core2 coole enough. It really does not matter how good is your CPU cooler as long as you don't give it enough cool air through your case fans.