Recent C2D E6600 from Scan - How do they OC ?

[Defenestration]

I am seriously considering stretching to a E6600 if I can OC it to 3.6GHz for 24/7 usage. I already have a Tuniq Tower 120 for cooling.

If anyone has purchased an E6600 from Scan recently and overclocked it, I'd appreciate if you could post the OC achieved, along with vcore and temps (at idle and under load).

Failing that, I may end up saving about £85 and getting a E4300 and OC'ing to 3.2GHz (and maybe a bit more).

[zawer612]

Had a new E6600 from scan last week (L640A) and it clocks pretty well, running it in now at 1.25V on a v-droop moded P5NE-SLi at 3.0ghz, idles at 22-23C and load at 34-35C.
Got it up to 3.6ghz at 1.45V orthos stable for 8+ hours (idles at 29 and loads at around 52C), all running under a tuniq tower HSF. Can actually get it stable at 3.9ghz with 1.57 volts but temps get a bit high for me (62-63 load).

TBH all three E6600 that i've had reached 3.6ghz stable, its just that the first one (L628B) ran too hot (63C+), second one (L629B) required alot of volts (1.55V, i don't feel 100% comfortable leaving my PC on 24/7 on 1.5V+) so this ones the best yet and i've yet to lap it (should lower temps 5-8C on load *fingers crossed*)

If you do get the E6600 chip from scan post back with your results, i might be interested in getting another one next month

[Defenestration]

Thanks for that info zawer612! That looks very promising. I would be happy with 3.6GHz @ 1.45 Vcore with 52C temps (although I would prefer to get it below 50C, if poss)

Do you mean lap the CPU and, if so, do you have any tips on lapping a CPU ?

Have you already lapped the Tuniq, or did you get one that was already pretty smooth ?

I will certainly post back here once I have got all the components.

[zawer612]

Lapped the second chip dropped temps from 27 idle to around 19C idle at 2.4ghz. Managed to get load temps at 3.6ghz@1.55V to around 47-48C, which was good, but your milage would vary, that chip was pretty uneven.

Lapping tips? well heres some, hope they help.

- Be extra careful of the rear of your chip, that is the only vulnerable part of the cpu when lapping. I get it quite dirty but try not to scratch it or break/damage any of the resistors. Personally i get a small folded piece of kitchen towel and stick it over the transistors.

- I use 240, 400 and 600grit sandpaper only, i just want to get a flat cpu NOT a mirror finish. make sure to get some isopropyl alcohol or better get yourself some arctic clean to clean up the cpu afterwards.

- I use a wet and dry sandpaper and actually sand WET (yes wet) i don't have a workshop/garage so i sand in my room, don't want dust getting everywhere. I use just a drop (yes a single drop of water) on the sand paper then place my cpu on top and sand away until the paper gets dry then i repeat again. Have sanded 3 cpus so far and haven't killed one yet *touch wood*

- make sure you sand on a flat and even surface (preferably a piece of glass).

- try not to touch the bare copper with your fingers, not that it'll harm it anyway but the oil from your fingers will react with the copper and you may get dark blotches appearing (unsightly).

- Don't buy sand paper from online cpu lapping retailers (lapping kits) often overpriced imo. Halfords, homebase, etc usually do assorted sand paper packs for around £2-3 and will easily be enough for one cpu (or maybe two if you wash them and dry them out again ).

I'm sure theres some other things i've missed but gotta go work now..

[vinnyT]

Interesting zawer612, never lapped the cpu before, only the heatsink.

One thing you did miss out, is that if defenestration (or anyone else) did this, they would do so at their own risk. If, after lapping, the cpu failed (for any reason) they can kiss it goodbye and forget any chance of claiming under the warrenty.

[Defenestration]

With results like that, only going up to 600 grit, it's a shame Intel don't do it themselves.

Good point about the warranty vinnyT.

I may be tempted to give it a go if I find my overclocking adventures result in temps that are too high (or if I feel brave one day).

[zawer612]

true, you wave your warranty bye bye after lapping. Which is why i tend to run the cpu in for a couple of weeks to make sure everything's hunky dory. Cpu's tend not to go bad if you keep volts and temp under check, i still got a Pentium 75, celeron 300, pentium III -500mhz, AMD athlon 2000 and 2500+, all are in full working order after years of abuse

Yeah the multi pack sandpaper i use only has 240, 400 and 600 grit.

Another thing to remember is that because the surface is so much flatter you have to use LESS AS5 than normal, this is because the cpu now has a much better contact with the heatsink base. I use a very small (around half a grain of rice in size) blob of AS5 then slowly work it over the whole chip until i get a VERY thin layer, then another little tiny drop on the heatsink base which i wipe into the base until it almost disappears (fills in the little micro pores).

[IntaCepta]

micro pores They sound cute!

Looks like lapping does cause great differences temperature wise. Might have a go when I get my e6300. We are talking about lapping the heatspreader ontop of the CPU chip right? Is there a pictorial tutorial of this for c2d chips? I'll have a proper look in a mo

[Defenestration]

Yeah, you lap the CPU's heatspreader.

One more question zawer612 - what do you use to spread the AS5 ?

[zawer612]

a razor is best or maybe even a unwanted credit card, at first it would seem the small blob wouldn't be enough to cover the entire chip but as you go along the AS5 would become less viscous and eventually cover the whole chip.
Be careful with razor though i've had a friend who cut himself quite badly and another who scratched his heatspreader, at a pinch you could use a small piece of folded A4 paper (make sure its folded stiff and not wider than the cpu, otherwise you get the AS5 everywhere.) thats what i use when i can get my hands on a razor.credit card.

I'm gona get some arctic cooling MX-1 to try when scan gets some back into stock, heard that when cured it beats AS5

Heres a link to lapping http://forum.***********.net/showthread.php?t=4735