My quest for 4GHz on air!

[Nemz0r]

My P5K-E would only reach about 3.7GHz before it just wouldn't go any further - no matter what I changed.

Now I got my P5E late last week in preparation for 2x 4870 in crossfire, so I thought i'd give it a little whirl as far as overclocking is concerned.

Got her to boot and go to windows login at 4005MHz but no luck getting to desktop at that, here is best i've gotten so far.



SuperPi 1M in 14seconds, quite disappointed in that - it's very memory dependant too, right? Would explain it as i've had to relax the timings to the pitiful 6-12-12-30 for this little experiment.

Off to swap my memory over to my 2GiB ballistix kit now - going for the big 4.0 .

Cooler is the ThermalRight Ultima-90i btw, temps are 55C at idle, and I daren't see what they are at full load in something like Orthos .

update: 3960MHz highest I can get, raising vcore anymore just hinders due to heat, 4GHz will have to wait till I (maybe) get watercooling .


Disappointing to be 40mhz from my goal, but oh well - 3960mhz on air is not to shabby I thinks.
SuperPi in 13seconds with this setup.

[SiM]

lol, you are going to kill that chip!

RAM speed/timing do make difference to pi times...

I got 14s superpi in my E7200 at 3.6ghz!

[staffsMike]

Is this just a technical exercise I do you actually want a usuable 4.0GHz Quad core.. lol

[Nemz0r]

Is this just a technical exercise I do you actually want a usuable 4.0GHz Quad core.. lol

The former of course! Just the question of "Can I?", 4GHz 24/7 would be crazy* (I think anyway!) .

ps. *that is unless you have crazy cooling to match!

[staffsMike]

I've seen one at 3.8GHz usable for half an hour at least with temps below volcano. I don't think 3.9 booted though.

[Nemz0r]

My chip looks pretty good then! Can boot at 4.1GHz, get to login screen at 4GHz and get to desktop and bench SuperPi at 3960MHz. Then bumping it down to 3825MHz lets me drop the vcore by a fair old amount. Not sure I like the temps at that though: 75C at load.

At 3.6GHz I can run it 24/7, 68C @ orthos 100% load on 4 cores, 62C 100% load on 4 cores doing folding@home. Gaming and general tasks it's cooler than that, not too shabby really .

Overall i'm pretty pleased with X38 already, though i've heard northbridge temp bumps up quite a bit with second PCIE card added - it's at 40C right now, no idea how that compares to P35 as I never bothered checking NB temp with the P5K-E. But X38 uses 35W and P35 11W (iirc), so i'll have to watch that. Now... Scan... get >16 of those darn Gigabyte cards in tomorrow pwetty pwease .

[moogle]

should be way faster than 14s at 4ghz. what make is the ram?

[Nemz0r]

should be way faster than 14s at 4ghz. what make is the ram?

Was 13secs @ 3960MHz with Crucial Ballistix PC6400 running at 1056MHz 5-5-5-20. Wasn't really utilising the CPU much - 50% on two cores, nothing to speak of on the other two.

ed: On another note - wow, SuperPi is slow compared to PiFast - 1mil digits in PiFast only takes 1.21seconds (@3.6GHz).

[moogle]

SuperPi is single threaded
13s sounds about right.