overclocking G3 yosemite bus...

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overclocking G3 yosemite bus...

Ok, all of you overclockers out there... I'm trying to figure out if it's possible to overclock a yosemite G3's bus to 133mhz... but I'm not finding any sites that list jumper settings past 120mhz. unfortunatly, this has the side efffect of taking the PCI bus down to 30mhz... which I'm sure would create issues with pci cards.
http://www.macinfo.de/tuning/tuning-g3yos.html
soooo.. with the 4x ratio between the ystem bus and PCI bus... 133mhz should keep the PCI bus at 33.3mhz. Does anyone know if this is possible? or is it just a stupid idea?

Cheers.

Oh yeah, do you think there'd be any issues with ZIF upgrade cards?

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If you do this, please video record your Mac starting up.

I have overclocked many computers in my time. I have overclocked Many many PCs as well as Apple computers. You are asking if there is a way to double the bus speed of your Beige G3. I would say no. I highly doubt your Beige G3 will boot and run stable with a bus speed of 75Mhz. Well, if you cool the entire case with liquid nitrogen, you might have a chance. If you intend on doing any kind of overclocking I highly suggest having at least PC-100 RAM in your Beige G3.
I would honestly leave the bus speed alone and just overclock the processor. Don't expect more than 50MHz boost though. If you realy want more speed, don't waste your money on a CPU uprade. A Blue and White G3 can be found on ebay for just over $100 if you play it right. A Blue and White G3 will be much faster than your Beige G3.

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ummm.. it's not a beige...

Ummm... it's not a beige, it's a yosemite... AKA B&W. apparently they're *fairly* stable with a 120mhz bus, but that messes with the PCI bus... and I have a hunch that 133mhz wouldn't.

I've got a couple of small copper heat sinks that i'd apply to some of the larger chips on the mobo before I attempt this...

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Well crap.

Alright, I made a mistake. I rescind my previous post. I would suggest using PC-133 RAM though.

*puts on dunce cap and sits in the corner*

To make myself feel a little better...the setting for a 66.7MHz bus on one of the charts threw me off.

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yeah, I can see how that woul

yeah, I can see how that would.. but that setting is very useful for testing 233mhz or 266mhz G3 ZIFs... ( you can buy a 233 for FIVE BUCKS here... http://stn2.headgap.com/resale/FMPro?-token=12874318&-db=ProductsC.fp3&-lay=WEB&-format=items.htm&-sortfield=SortID&-Max=40&category=parts&-find near the bottom) and you have to use it when using sonnet G4 upgrades, if I recall...

And PC133 ram would be a given for an overclock job like this.

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http://www.bekkoame.ne.jp/~t-

http://www.bekkoame.ne.jp/~t-imai/g3ce2.html Acute

See method #2... requires removing a surface-mount resistor from under the board.

(The second part of that jumper block is not all one thing)

Let us know how it works out for you...

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Many beiges will run fine wit

Many beiges will run fine with a bus speed of 83MHz. Its the CU that normally wont take it. But you can for instantance, use a 466MHz G3 upgrade, andinstead of using it at a bus speed of 66MHz with a multiplier of 7x, you can run 83MHz with a multiplier of 5.5x,, and get the same CPU speed, only a faster bus. Be sure your ramm will take it though.

As for the yosemite: not a chance in the world. They barely work at 100MHz, and in order to have a 745x G4 they have to run at 66MHz. If you want a faster bus, get a DA or newer G4.

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I am running an OWC G4 550Mhz at 600MHz in a B&W

I disagree that in order to use a G4 upgrade in a B&W G3 you have to use a 66Mhz bus. I am running an OWC G4 550MHz at 600MHz, with a 100MHz bus. The computer runs OSX.3.4 wonderfully. If you would like a screenshot, I would be glad to post it.

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You didnt read what I said. I

You didnt read what I said. I said in order to use a 745x G4. Yours is either a 7400 or a 7410, which yes, will work fine. A 7450, 7454, 7455, 7457, etc, will not work.

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THANKYOU!! I've been looking

THANKYOU!! I've been looking for a while for a way to do this... too bad it's not possible to do it with jumpers alone...

Now where can I get a spare motherbaord to test this... Blum 3

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While it is physically possib

While it is physically possible to set this setting, the machine will not run properly. You will run into time base issues making the system useless, and for very little real world gains.

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_

Quiet you- overclocking is fun.

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MAYBE worth trying

Even if you don't fry anything, imagine how slow your Panther video is going to run on a 30 MHZ PCI slot! I will probably try overclocking the bus of my Gossamer, but mostly because it can be run well over such a range. Also, I bought it for $25, and it is not my main computer. The gains / risks are relative.

The B&W G3 is Yosemite, Beige is Gossamer.

This "Imai" person is extremely lucky to have so many macs to play with this way!

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My Experience:

After reading this, I immediately headed down to the basement and grabbed one of my blue and whites to give it a try. I tried to take a 350/100 to a 400/100 and it wouldn't have it. The next best thing was to take it to 360/120, which ran decently well. It didn't crash under heavy processor activity such as running XBench (requires 100% for roughly 10 minutes). It was only after I moved the ZIF and jumpers to a machine that was originally a 300Mhz machine that it stopped working. I'm puzzled as to why doing this swap would cause the sour results. Anyone have ideas?

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Did you check for drive curru

Did you check for drive curruption and time base issues while at 120? AGP G4's (sawtooth/gigabit) wont go over 100 because of these issues, although they will appear to run ok for a short time. Soon as you load them up with something like dnetc, or a large file transfer, they crap out.

As for why it didnt work in the other machine, it could be the main board didnt like being over clocked, or maybe the ram didnt like it, lots of variables. I am surprised you got the first one to run for as long as you did at 120 Wink

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It's still running great, alt

It's still running great, although the built in ethernet port doesn't work for me. The RAM in there right now is PC100. I let it play a movie that used full processor power and ran XBench several times in a row and it didn't crash, so it appears to be quite stable. I put in an Apple branded 10/100 PCI ethernet card and it works fine. Just for comparision, I ran XBench before and after overclocking. A standard 300/100 scored 15.31 (Just processor, none of the other options), but the new overclocked 360/120 scored an amazing 26.53. I'm quite impressed, and with the exception of the built in ethernet problems, I've had zero issues.

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YES. I CANNOT REMEMBER WHERET

YES. I CANNOT REMEMBER WHERETHE INFO IS, BUT 133 MHZ IS POSSIBLE.HAS BEEN DONE, IF YOU REMOVE A COUPLE SURFACE MOUNT RESISTORS FROM THE MLB. 133 AND OTHER SPEEDS ARE AVAILABLE. STABLE? ?? DONT KNOW, ALSO 120MHZ FSBUS IS FINE, UNDERCLOCKING PCI DOESNT SEEM TO HURT , UNLESS YOURE PICKY ABOUT VID PERFORMANCE.

(OVERCLOCKING PCI CAN BE BAD) I DONT HAVE THE INFO. TRY THE "MYSTIC ROOM" IN JAPAN, ENGLISH VERSION.

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tried 133, results discouraging

Somehow, in my lust for a faster Quicksilver I came across this thread again and was inspired to attempt the Yosemite 133mHz bus overclock:

http://www.bekkoame.ne.jp/~t-imai/g3ce2.html

The B+W with which I attempted this has been running rock-solid at 500/100. I removed R811 and set the jumper block for 466/133. I'm hampered by the lack of PC133 ram, so I ended up borrowing a PC133 512 from the QS which of course only showed up as 256 on the B+W.

I did get it to boot into X, where worked for a bit while I was messing about in Finder and running System Profiler but eventually it locked up. Booted into 9, Finder wouldn't start up properly and kept quitting once it did start and the box eventually locked up.

I rebooted into X and tried to run Q3A for X which loaded and then locked up at the SN entry screen. That seemed to mess up my X partition as from then on I got only kernal panics when I tried to boot X.

At that point I gave up and pulled the MLB back out and soldered R811 back into place. The drive made a weird squawking sound as Disk Doctor tested the media, couldn't fix anything though . . . the X partition is still munged, I'm hoping DiskWarrior will be able to fix.

I've got too many variables here so I'm not sure if the problems resulted from the overclock or from something else. I had hoped to be able to at least get a Q3A benchmark so I could see if this is even worth the bother.

Ah well, such is life,

dan k

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