Very confused with overclocked temps.

Hey folks!
I'm a relative noobie when it comes to overclocking, but I did a little bit of research to find a safe clock speed for my chip.

I recently built a computer mostly because I fried the CPU socket on my previous Compaq PC. Somehow my chip was ok so it was recycled as well as a bunch of other parts like my RAM and DVD drives, monitor, keyboard...

My current set-up is
Antec 1000W PSU
Gigabyte EP45-UD3L P45 chipset, 775 socket.
2GB of RAM
GeForce 8400 GS (old because I was on a budget)
Pentium D 925 65nm chip. (Salvaged from old computer)
Antec Performance Max CPU Cooler

Now, when I first booted up the computer it was running at 2.6 GHZ. I decided to tweak it to 3.4 and ran a stability test. It ran well, but I noticed that the temp fluctuated between 42 C and 48 C (speed fan) and the max temp as I understand it is 68 C. But I noticed that it only reaches 3.4 when under load. Otherwise it sits at 2.6, when I also noticed the multiplier is locked at 12X but the FSB is ok up to 880 so that is what I am tweaking.

I got bored today and decided to tweak it to 3.8. Did a full stability test and it runs very well under load but the temperature is actually lower (between 36 C and 42 C) which confuses me because more power running through it should mean more heat especially because it is a 65nm chip.

Is there any reason for the temp difference? Or is there a better temp monitoring program that I should be using?

The two most popular programs for reading core temp's are Real Temp and Core Temp...

Real Temp 3.40
http://www.techpowerup.com/realtemp/

Core Temp 0.99.6
http://www.alcpu.com/CoreTemp/

I highly doubt that one of them will work on a Presler.

Yup, coretemp and realtemp will not work at pre-core cpu since they didn't implement that feature yet.

Your best bet is still to use that current speedfan, it will read using the legacy t-diode method from the cpu, though their accuracy sux.

to OCForums

Like bing says, Speedfan is the choice for you.

BTW - you should really consider upgrading your PSU....your really pushin it with that system

BTW - you should really consider upgrading your PSU....your really pushin it with that system

Click to expand...

Hahaha, yes I know it is a bit of overkill, but I bought it because it was half-price on newegg when I ordered my mobo and I figured it will be good when I start upgrading.

Now, does anyone know why the huge temperature difference happened? I'm very confused by that.