Optiplex 755 overclock

[Oshere1111]

so i overclocked q6600 to 2.9 GHz
and after 1 and half hour of playing the computer crashed, can someone help me?
max tempture was 74

 

[mdd1963]

Let's assume the thermal solution for a Dell Optiplex is not designed with the increased heat, resulting in crashes...; perhaps a somehwat less agressive overclock, or, heaven forbid, run it stock?

An 11 year old processor will eventually need replacing with something newer, alas...

 

[Oshere1111]

Let's assume the thermal solution for a Dell Optiplex is not designed with the increased heat, resulting in crashes...; perhaps a somehwat less agressive overclock, or, heaven forbid, run it stock?

An 11 year old processor will eventually need replacing with something newer, alas...

im not using dell cooling solution, i placed a new one, my cpu cooler is arctic 7 pro with 150 TDP

 

[Oshere1111]

i just had to turn down the multiplier a little bit, it was unstable at 2.92 GHz but at 2.90 GHz its is stable

 

[william p]

How did you get control of multiplier in a Dell Optiplex?
The usual method of overclocking the Q6600 in an Optiplex 755 is a tapemod to 3GHz by raisng the FSB to 333 from 266. There are 2 different Q6600 the SLACR G0 stepping and the SL9UM B3 stepping. The SLACR is much better for this. Dell # D9729 is the drop in cooler for those.
It looks like you're using SetFSB since 2.92 to 2.90 isn't a multiplier change.
FWIW a Q9550, or Q9650 will outperform the OC Q6600 by quite a bit. But the tapemod costs $0.
Use the 2nd photo.
http://www.tomshardware.com/answers/id-2125877/tape-mod-bsel-mod-intel-q6600.html
The fact that you can't raise Voltage limits the results you can get with these.

 

[mdd1963]

More to it than just cooler selection....I doubt Dell designed or chose their MBs in mind with much headroom in clock speeds, voltage/current capacity thru mainboard, or mem speeds....and cooling of voltage regulator circuitry....

 

[william p]

It's true the Opti 755 doesn't have a lot of headroom, but Q6600-3GHz is a known setup. Best performance is a Q9650 at stock speed, or tweaked if possible. A few of the older Pentium 4 computers did have some, like the E520 in my sig. Adding heatsinks to the VRM MOSFETs is a good idea, and can add some Voltage if that's what's limiting you.