I was just wondering what the fastest speed those of you who have oc'd your machines were able to achieve.

Personally, on my B&W G3 350, I was able to get the machine to boot at 600 & 650, but it wasn't stable. 550 wouldn't boot , and 500 works great. (That's where it's at now).

After a year of being at 500, the machine is as stable as it was at 350, and runs super cool (the heat sink is barely warm to the touch after hours of use). Still a pretty quick machine!

That's very peculiar. I bought a 350mhz blue G3 with the IBM copper G3 and was only able to overclock it to 400mhz. 450mhz wouldn't boot at all, but I never thought to try 500mhz...

I think I'll try it out.

[exa]

I have a beige g3/266 and I can only clock it up to 315mhz, unstable, 300mhz is where I am now. A friend has the same proc but could boot at 366mhz, I feel mad, that I got a more inferior cpu! The yield must have not been good... hah that reminds me, gotta steal the cpu from my other 3 beige g3s

[oscar]

266 OC'd to 315...stable

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-See Yea!

[jeffreyloaf]

My b&w G3 350 is now at 400. I'll be speeding it up soon though. I wonder if you get a higher quality chip and motherboard if you buy from Apple or if you buy lots of options? Your thought please.

Btw I have a revisions 2 board with dvd-ram and built in zip and scsi card from the Apple store.
Jeff
{Edit for spelling}

[This message has been edited by jeffreyloaf (edited 05-23-2000).]

[zac4mac]

PM8500 with XLR8 ZIF and OEM 400 ZIF
OC'd to 454 and stable for 6 months.
A co-worker bumped his Athlon from 500 to 700, but I've never heard of a Mac making that big of a jump... 350 to 500 with the same chip???

[thirtyfootsmurf]

B&W g3 300 o'cd to 700 something.
Stable for 4 months.
Beat a g4 on photoshop and Soundjam.
it has a cooling fan. I just ordered that liquid hydrogen cooling thing. 1400 bucks. Hope it works.


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-------------------------
What's that stuff in my toilet? Where are my pants? Why can't those damn monkeys stop banging those sledgehammers on my head?

Originally posted by thirtyfootsmurf:
B&W g3 300 o'cd to 700 something.
Stable for 4 months.
Beat a g4 on photoshop and Soundjam.
it has a cooling fan. I just ordered that liquid hydrogen cooling thing. 1400 bucks. Hope it works.

Where do you find this cooling stuff? I've heard of it, yet not seen it anywhere. Another frustrating thing is I can't find Jumpers ANYWHERE to overclock my G3/300. Is there a site for that as well?

I have an original Beige 266 (Rage II+) and I couldn't do ANY overclocking. I tried 300 and couldn't get past boot without crashing.
A friend bought a 450 G3 upgrade ZIF CPU and I got his 300, which haven't overclocked yet. The 450 is running at 550 though. Sweet.

I have a G4 Sawtooth :-( Can't overclock, hopefully there will be upgrades out that I can overclock! hmmm dual 600 G4's overclocked!

It is possible to OC upgrade card's isen't it?

Wish I bought a Yikes G4 (supposedly can OC them to 800! )!

[jeffreyloaf]

Well I tried to overclock my g3 350 from 400 to 450 but forgot to hit the cuda button and got the following messege. Default catch code=900 at % srro:ff818d70 yada yada yada.

I turned the power off hit cuda and tried again, twice, no go. I then switched back to 400 and success. Then back to 450, 500, 550. No go every time so I'm stuck at 400 until I buy a faster chip.
Jeff

The original 350Mhz G3 in my rev. 1 B&W ran great at 400Mhz. I sold the 350Mhz G3 and upgrade to a 450Mhz G3 that wouldn't overclock at all.

The MacTell 366 3:2 1M cache G3 processor card in my PowerCurve runs reliably at 424Mhz with 54Mhz bus speed and 2:1 cache.

I haven't really overclocked my rev. B iMac, but I have increased the cache's ratio to 2:1.

Finally, I still haven't worked myself up to try overclocking my AGP 500Mhz G4 yet and the machine will crash if i try to increase the cache ratio.

[ThinkInsane]

I have a Newer 466 upgrade in my Rev.B. Has anyone tried to chip one of these?

I have a rev1 B&W G3, overclocked to 500Mhz, been running stable since March 1999, no fan or extra cooling, wil not boot at 550 though.

Davide

Originally posted by zac4mac:
PM8500 with XLR8 ZIF and OEM 400 ZIF
OC'd to 454 and stable for 6 months.
A co-worker bumped his Athlon from 500 to 700, but I've never heard of a Mac making that big of a jump... 350 to 500 with the same chip???

Zac:
as you know all chips are bin sorted on the production line for speed. So a 300 chip really isn't any different from a 450 chip, it just didn't go through the test to make sure it would run at 450. So overclocking a 300 or 350MHz chip to 500 really isn't any different than clocking a 450MHz chip to 500. Indeed, clocking a 300-350 to 450 isn't any different than buying the machine at 450 to begin with (provided your chip will run at that speed, oh yeah, and it's cheaper! )

Originally posted by Davide:
I have a rev1 B&W G3, overclocked to 500Mhz, been running stable since March 1999, no fan or extra cooling, wil not boot at 550 though.

Davide

I find it interesting that the machine won't boot at all at 550, but yet 500 is stable as hell. Did you try clocking to 600? That worked for me, but it was unstable.

I think I might try clocking the bus in the next week or two (I'm in need of a new machine now anyways! )

I have tried 600 Mhz too and there I don't even get the start up 'bong'. 550 gave the bong and a grey screen, then the openfirmware screen, nothing more. But it's definitely stable at 500, which I agree is a little strange, but hey, I'm not complaining!

[bizzare]

how do you overclock your machine. I never really got it.

------------------
-Bizzare

Specs:
PowerBook (Firewire)
500 mHz
256 MB RAM
18 GB HD
AirPort
OS 9.0.4

Originally posted by bizzare:
how do you overclock your machine. I never really got it.

I don't know if you can OC a Powerbook, I'm not sure I'd want to with the heat issues involved, unless you want a warm lap

head over to www.xlr8yourmac.com for links to OC articles!

Oh well...I just had to find out for myself. I've been running my souped-up 233DT with a PowerForce 400 ZIF at 466 for well over a year now and it has been hunky dorey... at a high of 73°F even when dinking around for hours with large files in multiple apps like PhotoShop Illustrator etc. I can believe this temp because in this part of the universe the ambient temp is rarely over 70°F.
Thennnnn I come to this forum and read all this nifty stuff about pushing the envelope with overclocking...so I crack it open and crank it up a notch...hit the CUDA button and voila! Nothing! It seems that my copper ZIF can only do 466. I can live with that!

BTW I did upgrade my hard drive and stuck the old one in the zip bay hooked up to the CD IDE tape and it still stays cool.

1) Tried overclocking G3 Beige from 333 Mhz to 366 Mhz. Didn't have any errors while mounting disk images or running RamOMeter. But when I used Virtual PC I got occasionally an error.
Temperature went from max 48°C to 52-56°C.
I didn't want to take any risks further and went back to 333 Mhz.

2) Overclocked a Sonnet G3 220-233 to 260 Mhz with Robert Sixkiller's extension. Had good results and computer remained stable unless I used the slow AV-pds card.
Tried it with the Sonnet G3 260 1 MB cache too but there it was not as stable, even at 280 Mhz.

[wlonh]

"Robert Sixkiller's extension"... eh? what and where might that be?

ah, never mind i found it http://web.ukonline.co.uk/sixkiller/sonnet.html

sherlock took nearly 10 seconds to find it

[This message has been edited by wlonh (edited 05-28-2000).]

[Kozmik]

Supposedly iMac 350s and iMac DVs are overclockable to 1GHz. Someone get some liquid nitrogen, try it, and see if it's stable, because I'm too damn scared.

So far i have been able to bring a

- powerbook wallstreet 292 to 333 MHz, but i took it back since it almost melted down (83MHz Bus makes it hot)

- PowerPC 5500/225 to 275, stable as hell, is my server

- Beige G3/233 to 300, rest was not stable

- Yosemite G3/300 wont be stable with anything else
(Yeah, i really tried...)

- PowerBook 5300cs to 116 MHz (gets warmer though)

- May old IIfx from 40 MHz to 66 (with new CPU rated 50).

But when i see all the Yosemite posts, i guess i really should try again. I think i start of with 500 so my yosemite gets wake

regards

Catalyst

Originally posted by catalyst:
But when i see all the Yosemite posts, i guess i really should try again. I think i start of with 500 so my yosemite gets wake

Probably won't boot if you tried it at 350, 400, etc. Yes, it was weird of mine to boot at 600 and not 550! Also, try reducing the cache speed some with a cache utility, that might help.

Even though the CPU's in the Yoses are all essentially the same chip, it's luck of the draw whether or not you have a chip that will go faster than it's rating. The chips are all bin sorted for speeds and tested to make sure they run that speed. They may or may not be able to go faster, usually they will but sometimes not!

I've done a little overclocking in my days....
PB DUO 230 -40mhz
Quadra 700 -40mhz
Performa 636 - 40mhz
2 6100's - 80mhz
6500/225 - 275mhz
Sawtooth G4/350 - 400mhz

The hardest ones were the 6500 and the sawtooth because those were the toughest little bugger resistors to resolder. And with the sawtooth I had to add a 1/4 watt 1kohm resistor to the proccesor board! All exept the PB and the sawtooth used fans on the heat sink.

I'm looking into some type of liquid cooling for some serious overclocking with the sawtooth but I have no Ideas what type of pump to use for the liquid. Any Ideas, anyone?

[camera punk]

Wish I bought a Yikes G4 (supposedly can OC them to 800! )![/B]

can someone verify this and give instructions?