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MDD overclock and cooling mod
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Junior Member
Join Date: Mar 2003
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Ive successfully overclocked my dual 1.25Ghz MDD to 1.5Ghz - System was running fine for 2 straight days but had 2 lockups (which is expected) will probably wind it back down to 1333Mhz to play it safe.
XBench results here
I also added a fan overide mod that controls the main system fan and keeps it a predetermined speed rather than fluctuate up and down as before. I posted pictures of the mod at http://www.bitsandpieces.info/
(
Last edited by �tomic; Feb 4, 2004 at 08:38 AM.
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Professional Poster
Join Date: Apr 2002
Location: New York City
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make your sig less enormous
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Mac Enthusiast
Join Date: Mar 2003
Location: Pittsburgh
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That's pretty sweet. You don't hear about many Mac users modifying their rigs. Too bad it wasn't stable. Did you build the fan control unit from the ground up or was there some kind of kit you used?
Unfortunetaly, Axo1ot1 is right though, your sig is too large. Too bad, it's pretty freaking sweet.
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^Thanks to sealobo
Viva le ScrollWheel!
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Junior Member
Join Date: Mar 2003
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Originally posted by xylon:
Did you build the fan control unit from the ground up or was there some kind of kit you used?
built from the ground up.
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Mac Elite
Join Date: Sep 2001
Location: Folding customer returned size 52 underwear.
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That is totally retarded for more then one reason.
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{ v2.3 Now Jesus free}
Religions are like farts: yours is good, the others always stink.
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Posting Junkie
Join Date: Oct 2001
Location: South of the Mason-Dixon line
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I dunno.
Apple would have charged you $700 for those extra megahertz.
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Fresh-Faced Recruit
Join Date: Apr 2003
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give us the steps and jumpers your made changed to achieve the speed bump.. id like to try this on my play G4 and give it a shot
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Mac Elite
Join Date: Oct 1999
Location: near Boulder, Colorado
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Good on ya for OCing your Mac. Avoid advice from people who fold others' underpants...
A really good test for stability is to make a disk image and then mount it. Any stability issues will rear their heads then.
I OC'd a couple of Macs - a PM8500 w/ a G3-400 running at 454MHz for the last 4 years(SETI), 24/7 along with my newest "old" Mac, a DPG4-500 OC'd to 550 since it was a month old.
I really don't feel the need to OC my new DPG5 tho. It's just plain fassssst already.
Nice pics also on your pages. Been to Perth/Freemantle, but didn't get a chance to get "out in the country". The radio telescopes look like the same ones at the VLA in New Mexico.
Z
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Moderator Emeritus
Join Date: Sep 2001
Location: Arizona
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Excellent job Atomic, congratulations.
I must admit that I am very surprised to see a 7455 reach those speeds and remain at all stable.
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I like chicken
I like liver
Meow Mix, Meow Mix
Please de-liv-er
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Addicted to MacNN
Join Date: Mar 1999
Location: Bellevue, WA
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Senior User
Join Date: Jul 2002
Location: LA
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Good OC and mod. Job well done.
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One iMac, iBook, one iPod, way too many PCs.
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Junior Member
Join Date: Mar 2003
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Originally posted by djjuice:
give us the steps and jumpers your made changed to achieve the speed bump.. id like to try this on my play G4 and give it a shot
What model G4 do you have? I only have info on the MDD model - earlier models have different jumper settings.
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Senior User
Join Date: Jan 2001
Location: Upwind from Quebec...
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make your sig less enormous
Good to see we'll always have people around to focus on the "really important" things...
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people ruin everything....
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Junior Member
Join Date: Mar 2003
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Originally posted by Kenneth:
[B]
Could you explain to me.. what's the PCI cards you have?
- Geforce 4Ti
- RME 96/36 Digital audio interface
- ATTO UL3D Ultra 160 SCSI Card
- Canopus ADVC-1394 video capture card
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Junior Member
Join Date: Mar 2003
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For all the whiners, i removed my sig completely
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Senior User
Join Date: Jan 2001
Location: Upwind from Quebec...
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Why?
...I was being sarcastic to the first poster....
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people ruin everything....
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Junior Member
Join Date: Mar 2003
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Originally posted by acadian:
Why?
...I was being sarcastic to the first poster....
Yeah I know you were being sarcastic, that comment was not directed at you but when a sig size takes over the importance of a thread, Its better to get rid of it than have to deal with the crap in future. It's not that im caving in but merely not bothered arguing such a stupid subject.
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Fresh-Faced Recruit
Join Date: Apr 2003
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Im using a dual 1.25 MDD powermac
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Junior Member
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Posting Junkie
Join Date: Oct 2001
Location: South of the Mason-Dixon line
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Is there any way to increase the CPU core voltage?
If an overclocked processor is mildly unstable it can sometimes be stabilized by bumping up the core voltage about 10-15%
This adds heat, but it shouldn't be an issue with an adequate heatsink and good case airflow.
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Junior Member
Join Date: Mar 2003
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Originally posted by Spliffdaddy:
Is there any way to increase the CPU core voltage?
If an overclocked processor is mildly unstable it can sometimes be stabilized by bumping up the core voltage about 10-15%
This adds heat, but it shouldn't be an issue with an adequate heatsink and good case airflow.
Yes. Voltage increases are documented also on the page
http://www.xlr8yourmac.com/systems/g...PU_Module.html
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Junior Member
Join Date: Mar 2003
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Phase 2 of this mod is now complete - the original mod was not good enough so I used the G5 as inspiration... photos have been updated
http://www.bitsandpieces.info/
(
Last edited by �tomic; Feb 4, 2004 at 08:38 AM.
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Fresh-Faced Recruit
Join Date: Mar 2004
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I just overclocked my MDD dual 1.25 ghz to dual 1.42.
The speed increase is great !!!
thansk to this great page
Xbenching 172 now, was 142 before.
thanks
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Professional Poster
Join Date: May 2001
Location: Switzerland
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I frequently OC PCs. Athlon 2500+ and 2500+M OC's, fine. I have OC'd my 2600+ Barton to 3200+.
But voiding your warranty on a Powermac for only 100mhz?
I'l be honest and say that I just don't get it.
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Mac Elite
Join Date: Aug 2000
Location: Vancouver B.C.
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How much is the Analog card? That's exactly what I need to import our old 8mm tapes. 36 of them. Although a Stereo card would be better (so I can make VCD's out of "Dotto on Data" Have hosts permission (only person in the world with all espisodes).
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Get busy living or get busy dying --Stephen King
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Mac Elite
Join Date: Apr 2000
Location: Minneapolis, MN USA
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My Athlon box I have running at 2200 mhz with an Athlon 2400 chip
(2 ghz) installed and it works fine.
My G4/400 I was unable to get to operate at even 450 mhz - it was
a very difficult modification to say the least too.
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Forum Regular
Join Date: Nov 2001
Location: DP, OC, CA, US
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Originally posted by Todd Madson:
My G4/400 I was unable to get to operate at even 450 mhz - it was
a very difficult modification to say the least too.
You must be referring to a G4/400 Sawtooth then, because I overclocked my G4/400 Yikes to 450 with no problems, and the mod was very simple--switched a few jumpers and that was that. It's been running 450 reliably for about 3 years now. Can't complain.
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Mac Elite
Join Date: Dec 1999
Location: Utah
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I did the same thing on my G4 Yikes machine. Added a PCI slot fan "Just in case" as the CPU temp did rise a bit.... but it's been stable for nearly 8 months. A few jumpers moved got me a 50Mhz boost.
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Work: 2008 8x3.2 MacPro, 8800GT, 16GB ram, zillions of HDs. (video editing)
Home: 2008 24" 2.8 iMac, 2TB Int, 4GB ram.
Road: 2009 13" 2.26 Macbook Pro, 8GB ram & 640GB WD blue internal
Retired to BOINC only: My trusty never-gonna-die 12" iBook G4 1.25
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Dedicated MacNNer
Join Date: Apr 2001
Location: Atom Bomb, USA
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...I've been running my Dual 867 at Dual 1 gig since the first week I bought it, which was a couple weeks after Apple introduced them. So whats that? A year and a half, almost 2 years?
No issues EVAR!!11!!!oneone!!!!11!!
I can't wait for some 7557 upgrades for the MDD machines. I'd really like to have a dual 1.67 or 1.75 G4. I think it should be possible.
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"People who sacrifice essential liberty for a little temporary safety deserve neither." -Benjamin Franklin
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Moderator Emeritus
Join Date: Sep 2001
Location: Arizona
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There shouldn't be any issues. The 867s were underclocked Dual 1Gigs. Same CPU and board except for the resistor.
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I like chicken
I like liver
Meow Mix, Meow Mix
Please de-liv-er
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Junior Member
Join Date: Mar 2003
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Posting Junkie
Join Date: Oct 2001
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& the world's fastest (2.1GHz) L3 cache according to that screenshot
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Moderator Emeritus
Join Date: Sep 2001
Location: Arizona
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I snagged up a GigaDesigns Dual upgrade and got it yesterday. It is solid as a rock @ 1.33, but at 1.47 it locks up after a few minutes of Unreal 2004. I am wondering if it is just a quirk, and if the chips might handle 1.53 or 1.6. I also have yet to try 1.4.
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I like chicken
I like liver
Meow Mix, Meow Mix
Please de-liv-er
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Moderator Emeritus
Join Date: Sep 2001
Location: Arizona
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The machine will come on but wont chime or give a display signal at 1.53 and 1.6GHz. At 1.6GHz, the power button flashes 3 times intermittently. At 1.47GHz, it still goes down after about 20 minutes of stress testing. And at 1.4GHz, System Profiler reports 0 MHz, which I am not keen with. So, it looks like I am destined for 1.33GHz. Oh well, not a bad upgrade for the $630 I paid for it.
I have considered tinkering with the core voltage, but Giga says doing so will void the warranty. Then again... I don't see how they would ever find out...
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I like chicken
I like liver
Meow Mix, Meow Mix
Please de-liv-er
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