Hey guys, I finally got my Power Mac G4 MDD up and running. First thing was to install Tiger, which had to be done in Target Disk Mode because this baby doesn't have an internal disk drive (that works). So, after doing that, I thought "Well, I need more RAM, but for now, lets OC it to 1.5 Ghz. So, following a guide on bitsandpieces.info, I debridged a set of 5 pads and bridged a new contact to tune up the CPU speed from 1.25 to 1.5

nice

Very cool! I've been reading about that mod too. What kind of CPU temperatures are you getting? The author of the article I read swapped in a copper heatsink from a 1.42GHz model to help with the extra heat.
It looks like most of the Powermac models can be bumped up at least one step (in speed). I've seen another article on modding a dual processor Quicksilver model from 1 to 1.2 GHz.

Oh, the heatsink doesn't even get very hot. Mines an MDD model, they have the 7455B, very clockable, I could probably do 1.6, if I stepped up the voltage, probably up to 2ghz on a 1.42 dual with voltage step up. As far as temps go, what program can measure it?

I'm not sure how you would measure a Powermac's CPU temperature.
Does anyone know if Powermacs come with a thermal diode?

It would be interesting to know what the max speed a 1.42 GHz model could do. They appear to have a better heatsink.

Temperature Monitor is what you need. It'll show you the temperature of the CPU and drives.

@Dreamcast270mhz
NOT a good idea overclocking MDD .... .... .... and remeber that a MDD @1420 or @1250 are VERY powerful :)
regards

I over clocked my older Macs all the time. Its not a big deal as long as you dont get to crazy. If you start to get kernal panics then back it down a bit.

250mhz is very minor for a PPC G4 7455B. Divinity, IDK what ur smoking, lol, but OCing MDDS is what most people who are like us do :)

Never had a computer that couldn't be a little more powerful.

But your right about not need that much power to run MorphOS.

I may upgrade later, but right now I've got a 933MHz Quicksilver Powermac with 768MB of RAM, 120MB hard disk, 265MB Radeon 9250 video card, Soundblaster Live card, and an NEC based USB 2.0 card. This ought to be powerful enough.

[ Edited by Jim on 2010/9/12 4:27 ]

There are guys here who overclock their irreplaceable Cyberstorm cards 40-60 percent or more past the 50MHz 060 they came with. Are you really gonna worry about breaking a box you can replace for $75 on Craigslist?

> There are guys here who overclock their irreplaceable Cyberstorm cards 40-60
> percent or more past the 50MHz 060 they came with.

But not without replacing their old 68060 with a "new" 68060 Rev 6 beforehand.

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But you should do that better *before* registering for MorphOS.

btw.: to all US $ guys out there: The EUR is weaker now, so MorphOS got considerable cheaper recently. Will probably stay weak for a while and may get even weaker (Greece is/was not the only troublesome country in Euroland).

So, how much does registering MorphOS cost in US dollars?

Well according to XE 150euros is US$204.008. No guarantee paypal will use the same exchange rate though...

for what I have seen MDD G4 is very very very powerful VS others :) (also in single CPU mode), so absolutely no needed any overclock :)

regards

When you overclock the 060, doesn't it also overclock the memory logic around it? I know I had to air cool those chips with their own little fan before mine would reliably overclock. I'm referring to those little chips beneath the RAM sockets.

The cache on the MDD speeds up, the highest clock was 1.67 ghz, a 1.42 dual should go up to 1.8 or more at least. 1.5 is the highest on a 1.25 without jumping the voltage up.

> When you overclock the 060, doesn't it also overclock the memory logic around it?

Yes, I guess so. You'd have to make sure to be able to clock the RAM semi-seperately from the CPU. I don't know in detail about the Cyberstorms (IIRC there are variants with several quartzes), but there you have examples of Apollo 4060 and Apollo 1260 at 100 MHz:

http://www.webalice.it/gratteri/apollooverclock.html
http://chain.3dgrafika.cz/100mhz/

(At 80 MHz CPU clock the RAM would be underclocked to 40 MHz.)

I get about 31?C average, upper limit seems to be 60?.

After Leopard upgrade, I get about 29?C on average. Odd

not a good idea to overclock the G4 Dual CPU daughterboard card of PowerMac G4 MDD ... ... ... and not useful because every MMD Mac is VERY powerful.

regards

[ Edited by Divinity on 2010/2/28 10:26 ]

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Well, let's see where we are at when MorphOS for PowerMac is actually released :)
Currently it doesn't really look like it will be released with next MorphOS 2.x update. It is progressing very slowly and actually holds up releasing some interesting bug fixes.
It has not finally been decided yet but PowerMac support probably won't make it into the next update, namely 2.5.
IMHO Ralph was way too optimistic announcing it for the next update and actually I was surprised by that early announcement as well, really.
But this is just my 2 cents to all of this ....




[ Editiert durch pega-1 an 2010/2/28 17:09 ]

[ Editiert durch pega-1 an 2010/2/28 19:28 ]

@Divinity

Already heard your opinion, thank you. And no, I don't have a dual cpu card, just a single that actually runs cooler at 1.5 then at 1.25, the fan isn't always at full speed

@pega-1

It sounds to me as if you all are working on different things under MOS, I kinda expected that, but you all must have a hell of a time incorporating it all back into the source without breaking things... I am still hopeful of the 2.5 release having powermac or emac support, but I'll keep your words in mind, thanks. And because you say it hasn't been finally decided, I think the general opinion around here, reading the posts is:

Current MOS machine owners (Peg,Mini) want bugfixes more than anything else

MOS machine candidate owners (Me, anyone with a powermac currently) think that bugfixes can wait

Of course, thats my interpretation of it all, your decision is yours, but public opinion should be considered (IMHO). Of course, new hardware support means more licenses, but just how many is the question, anyone up to tallying it for the devs?

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Just imagine how cool it would run at 2.0GHz, how exactly are you measuring temperature? ISTR that the G4s builtin monitoring isn't accurate.