Archived from groups: alt.comp.hardware.overclocking (
More info?)
"Ed Forsythe" <EdForsythe@hotmail.com> wrote in message
news:abSdnWZ0DP_V1Tzd4p2dnA@giganews.com...
> Hi WD,
> Thanks for the tips. I'll use them when I OC again. I'm not sure I agree
> with your cooling adviice. I'm inclined to go for a negative pressure in
> the case so that cool air is drawn in from every possible ingress point. A
> positive case pressure would, IMHO, cause hot air to pile up inside the
case
> disrupting the laminar flow in the theoretical non-turbulent plenum. I
> suppose a 1:1 system would be perfect theoretically but you'd need a
sealed
> case with no turbulence producing obstructions to insure that it would
work
> at max efficiency. Tell you what - next time I'm in the case I'll
> disconnect the two top exhaust fans and check my temps
Thanks again -
> --
> Tally Ho!
> Ed Forsythe
> Maryland, USA
>
>
> "wasdiscovered" <looking@u.com> wrote in message
> news:abSdnckU_dnlkzzdRVn-ig@comcast.com...
> >
> > "Ed Forsythe" <EdForsythe@hotmail.com> wrote in message
> > news:zrednR5oteh8tgTdRVn_iw@giganews.com...
> > > Hi Troops,
> > > I've got my 2.8C up to 3360MHz but it's not quite stable - reboots
after
> > > some intense flying in my sim.
> > >
> > > Intel 2.8C, SL6WT, Zalman 7000A, ABIT IC7-Max3, ATI 9800 Pro w/Zalman
> VGA
> > > cooler + fan, 1G OCZ Deluxe Gold PC4000. Lian-Li full tower case
(PC-75)
> > > with 6 fans (2-front intake, 2- lower rear exhaust, 2-upper rear
> exhaust),
> > > PCP&C 510 P/S.
> > > Settings:
> > > NB Strap - By CPU
> > > Dram Ratio - 1:1
> > > AGP Ratio - Fixed
> > > Fixed AGP/PCI Freq - 66/33
> > > CPU Core V - 1.725v (Too high? Temp = 48° idle, 54-56° load)
> > > DDR SDRAM V - 2.7v
> > > AGP V - 1.55v
> > > DRAM Timings - Manual 3,8,4,4
> > > AGP - 8x
> > >
> > > 3DMark2003 = 5873 (good/bad/mediocre?)
> > >
> > > I checked Overclockers.com and my CPU voltage is already higher than
99%
> > of
> > > the DB responders. Think I should raise my DDR V to 2.8? 3.4GHz is
OK
> if
> > > it's stable but I was hoping for 3.5 :-(
> > >
> > > --
> > > Tally Ho!
> > > Ed Forsythe
> > > Maryland, USA
> > >
> > >
> > >
> >
> > Yes you vcore is to high and your AGPV is to low. Put both your mem and
> core
> > volts to specs. Check your idle and load temps and write them down. It's
> > important to do this before you o/c because the max three reads temps
> high.
> > Start at 2.8 and work your way up. Use prime and memtest as you slowly
> > increase your speed. Increase vcore by the smallest increments and only
> when
> > needed. Mem voltage should not be increased until your o/c becomes
totally
> > obscene. Closely monitor your temps. If you get to a point where the
small
> > vcore increase does not help then instead of moving the vcore even
higher
> > try raising the AGP.At a certain pointt AGP voltage will cause problems.
> > Usually it happens higher than 3.3 but I personally run mine at 1.65.
> >
> > Here are some bios settings you might try.
> > Set nb strap to 800 and disable the last two gat settings. Disable cache
> > bios and the other cache one next to it hmm? I forgot what it was
called.
> > Don't use auto settings if you know what the setting should be. ie.
> divider
> > 1:1 not auto.
> >
> > P.S. Taking into account that the fan on your power supply is an exhaust
> fan
> > this mean that you have 5 exhaust fans and 2 intake fans. This is not
> good.
> > The total cfm of the two should be more closely matched.
> >
> >
>
>
Operating a case with significant negative air pressure means it will draw
air (and dust !!) inefficiently through every slit and pinhole in the
case/case cover. IMO that is not a positive situation. I prefer balanced or
slightly positive air pressure, to keep things inside clean (no dust
accumulation). All air should be drawned in via filters.
My advice to you situation is try to modify the exhaust fan connection from
12V to 7V (you can do that with a modded 4pin molex or cut & solder
connectors. this will a) still utilize your existing hardware, b) reduce
noise levels, c) reduce air draw to more balanced level, d) reduce power
draw (and heat) from PSU.
Start with lower exhaust fans - they draw relatively cool air from front
(lower) intake fans out of the case before it removes much heat. let the air
flow across your system upwards and backwards, to the PSU+upper exhaust
fans.
Optionaly disable one or both lower exhaust fans (to reduce noise even more)
or put them both at 5V for extremely low RPM, noise and power draw... and
put your 2 upper exhaust fans at 17V (or one at 7V, one at 12V to be on the
safe side) - if you are comfortable with this kind of modification (crossing
the wires of the 5v+, 0, 0, 12v+ molex connectors).
Internal air flow pattern is invariant to external differences. Its
turbulency will only be governed by geometry, path, and the gradient of
intake/exhaust ports, whether it is higher or lower than outside pressure is
irrelevant.
Or maybe I'll just be satisfied
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