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I just software overclocked my G4 400 to 533MHz!

Yeah, the Ram does help but the machine was still faster with the OF Hack. What graphics card do you have, ecino1? That might account for the Xbench results. Also, a faster hard drive will help a lot in the read/write tests

Also what extra kernel extensions and other stuff have you installed on your System.
 
Originally posted by grabberslasher
I could tell you if I knew your multiplier (for your upgrade card).

Your original multiplier is 5 (5x100Mhz) so your upgrade card must be 13(?!). I'm not sure, but multiply 133MHz by 13 for your end result.

1.729 GHz!

But I doubt that the hack will apply to your upgrade card. More likely it will only overclock your 500MHz (to 665). There's no harm in trying - I don't think a simple hack such as this can damage your computer. All it is is basically a startup setting.

True speed increase though.
Click to expand...

I have a Gigadesigns 1.25Ghtz upgrade card, with the processor jumpers moved slightly so it correctly registers in ASP/About... as 1.3Ghtz (both OSX/9). They have jumper setting on xlr8yourmac and on gigadesign.com - do you think I could still apply this hack as there are separate jumpers on the upgrade card to use a 133Hz bus.

I'd hugely appreciate everyone's help with this.

Check out my old thread for more details about my machine...https://forums.macrumors.com/showthread.php?s=&threadid=23975&1.3
 
Upgraded PB400 !!!!

Whey Hey !!!! - Just upgraded my PBG4 400Ti to 1 Gig

How I hear you ask . . . . . . . . . . . .

Really simple. . . . . . . .

Bought a new one ! ;)

Seriously though, using PC100 RAM will probably stop the hack from working as MOST PC100 RAM will not work correctly (or in some cases at all) at speeds of 133. If possible change it all for PC133 then re-test speed - will be interesting to see if it works.

Keep Smiling
 
Does it work with Quicksilvers?

Does anyone know if this hack works with Quicksilvers?

Currently running a 733 Mhz.. want it to be faster =)
 
Originally posted by grabberslasher
I don't see why the 350MHz G4 (Yikes) would be classed as a Rev A. - it came out at the same time as the Sawtooth model.

Let's just say "early Sawtooth G4s" (originally 400-450MHz after Apple reduced the speeds of the lineup).
Click to expand...

Not quite. I said the "Rev A. G4 400" was a Yikes model. When the G4s were introduced in August 1999, the 400MHz model was a Yikes, and only the 450MHz model was a Sawtooth. The 400MHz Sawtooth didn't replace the Yikes model until October 1999.

So technically speaking, a Rev. A G4 400 is a Yikes and not a Sawtooth. Anyone confused yet? :D
 
Re: Does it work with Quicksilvers?

Originally posted by Pallish
Does anyone know if this hack works with Quicksilvers?

Currently running a 733 Mhz.. want it to be faster =)
Click to expand...

Nope. The QS is a different beast.

You may find the following pages helpful:

http://www.lostboi.com/tutorials/overclockg4.html
http://www.bekkoame.ne.jp/~t-imai/g4de1.html (English page)
http://www.bekkoame.ne.jp/~t-imai/g4dj1.html (Japanese page w/ more pictures)

Overclocking the QS requires physically altering the motherboard. Not for the faint of heart.
 
Re: Screenshots

Originally posted by grabberslasher
If you want screenshots/photos to prove it I can show you. The serial number on the back of the machine will prove that it was a 400MHz machine.
Click to expand...

I don't mean to insult your personal integrity, but screenshots or photos offer no proof in this digital age... - j
 

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I have two PC133 SODIMMs in by TiBook 500. Would the bus change work on the laptop as well? My concern would be overheating beyond the already high temperatures of the system in its stock configuration.
 
Originally posted by Hemingray
Not quite. I said the "Rev A. G4 400" was a Yikes model. When the G4s were introduced in August 1999, the 400MHz model was a Yikes, and only the 450MHz model was a Sawtooth. The 400MHz Sawtooth didn't replace the Yikes model until October 1999.

So technically speaking, a Rev. A G4 400 is a Yikes and not a Sawtooth. Anyone confused yet? :D
Click to expand...

Actually - if you remember correctly - Apple couldn't get enough 500MHz processors off Motorola at the launch of the G4 so it downclocked the whole range by 50MHz. The Yikes model was originally 350MHz and my model was one up - a Sawtooth 400MHz.

Bought it a few weeks after the launch.

So techically my machine was a "Revision A" machine.
 
I can confirm that it works on PowerBook G4 rev.A.
I have just overclocked my TiBook/400 to a much "snappier" ;) TiBook/533.

I was a bit worried if my RAM would hold for the 133 MHz bus, but it did, and now I'm just waiting for the fan to kick in.. It havn't done that yet. T +33 mins and counting.

Thanks a bunch! This really made my day! A 33% faster machine after just 5 mins of haking!
 
Applied the hack to my 1.3Ghtz machine, and it reported 1.3Ghtz at 133Hz - but Xbench results were slower, expecuially in processors tests, so I've changed it back...

Hamish
 
Originally posted by Henriok
I can confirm that it works on PowerBook G4 rev.A.
I have just overclocked my TiBook/400 to a much "snappier" ;) TiBook/533.

I was a bit worried if my RAM would hold for the 133 MHz bus, but it did, and now I'm just waiting for the fan to kick in.. It havn't done that yet. T +33 mins and counting.

Thanks a bunch! This really made my day! A 33% faster machine after just 5 mins of haking!
Click to expand...

Did it actually make your machine faster? It actually gave me a lower xbench score, although i could not tell any speed difference on my G4 400. I am using the stock 16mb ATI rage card, with 896mb ram (all 133mhz), and a 7200RPM 80gig Maxtor Hd.
 
This hack does not seem to work.

I tried this out on my 450 G4 Cube.

When I rebooted, ASP and About This Mac reported that I was running a 533 G4. This was not an expected result- with my 4.5 multiplier, I expected to get 600 MHz.

Casual usage revealed no obvious performance increase. I booted up from my Norton Utilities CD and tried out their System Info application. It reported no performance increase at all- if anything a minor speed decrease.

A reboot with a PRAM zap returned everything to the original state.
 
Originally posted by grabberslasher
Actually - if you remember correctly - Apple couldn't get enough 500MHz processors off Motorola at the launch of the G4 so it downclocked the whole range by 50MHz. The Yikes model was originally 350MHz and my model was one up - a Sawtooth 400MHz.

Bought it a few weeks after the launch.

So techically my machine was a "Revision A" machine.
Click to expand...

I have a Yikes G4 400, and I ordered it a few days after the G4's launch. I'm merely stating that the first G4 to clock in at 400MHz was a Yikes, and not a Sawtooth. So, even using your argument, the claim of "I just software overclocked my Rev A. G4 400 to 533MHz!" could mean either a Yikes or a Sawtooth, and obviously this mod would only work on the Sawtooth, which was NOT the first 400MHz G4.

The Yikes G4 debuted at 400MHz on August 31, 1999. Then, on October 13, they downgraded the whole line 50MHz, as you said, and in stepped the 400MHz Sawtooth, making my Yikes G4 400 possibly the shortest lived Mac ever?? (Not sure about that.)

So, since the 400MHz Sawtooth was released AFTER the 400MHz Yikes, technically the 400MHz Sawtooth isn't a Rev. A. Not in the 400MHz's case. But for the rest of the G4 line? Yessir. I know this is turning into a big deal over minutiae, but it's a matter of principle. ;)
 
Originally posted by Pallish
hm..... wtf does "cntl" mean? it says to press "cntl" + "c"

is it control?
Click to expand...
Japp, it is. ctrl + c would have been better to write.

I tried this at my computer. Hade a little problem in the beginning understand the text. But when i saw i did wrong from the start, i just did it right. But the funny thing is that my comuter were downclocked instead of overclocked. Computer:
Old: TiBook 550 Mhz @ 100 Mhz
New: TiBook 533 Mhz @ 133 Mhz

So, is there any way to change the multiplier for the processor, anyone know how to to that? ;)
 
I've done this successfully on a Ti500 (--> 533MHtz w/ 133 bus) and Xbench was slower, and on my O/C 1.3Ghtz Gigadesigns Sawtooth, and again, Xbench was slowers.

I've reset all mine now. Worth a try though...
 
sorry i am late:

the guy who did this to his MDD 867 - UNDO IT. To this on a DP system you must do it to both processors. Here:

if there is a space - TYPE IT
<return> means press the return key
Code: 
" /" select-dev<return>
09ef21aa " clock-frequency" get-my-property 2drop !<return>
" /cpus/PowerPC,G4@0" select-dev<return>
09ef21aa " bus-frequency" get-my-property 2drop !<return>
408e4b46 " clock-frequency" get-my-property 2drop !<return>
09ee81bc " config-bus-frequency" get-my-property 2drop !<return>
027ba06f " timebase-frequency" get-my-property 2drop !<return>
" /cpus/PowerPC,G4@1" select-dev<return>
09ef21aa " bus-frequency" get-my-property 2drop !<return>
408e4b46 " clock-frequency" get-my-property 2drop !<return>
09ee81bc " config-bus-frequency" get-my-property 2drop !<return>
027ba06f " timebase-frequency" get-my-property 2drop !<return>
exit the nvram by pressing control-c on the keyboard then type:
Code: 
nvstore<return>
setenv use-nvramrc? true<return>
reset-all<return>

MAKE SURE YOUR RAM IS FAST ENOUGH. This will set any machine with PC100 ram to needing PC133, PC2100 - PC2700, PC2700 - PC3200. If you have a 167 bus already i advise against this. i advise against this. This just undoes the slow down apple puts on in the factory. For a MD 867 system a real 1G will be a bit faster because the cache is not overclocked and is still running at 867 vs 1083 in a real 1G system
 
This is complete and utter crap. Show some benchmarks of dnet client running before and after the upgrade and then I'll believe you. I did this OF hack on my DP867 and it did nothing to real-life performance, only what it displayed.

Busting out the soldering gun is the ONLY way to overclock a G4.
 
Re: MDD = Yes ? and QS= No?

Originally posted by Pallish
How come it works on MDD's but not on QS's??
Click to expand...

I just said it didn't work on my DP867, which is a MDD.

It doesn't work on ANY G4 tower. Period. End of discussion.
 
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