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software overcloking a g5?

Mord

Mord

macrumors G4
Original poster
Aug 24, 2003
10,091
23
UK
i use a little kernal patch called icook and I know that the g5's have the same technology thats in the 750fx that my ibook has (i think it's called speedstep or somthing like that) and i'm wandering if anyone has tryed to use it on there g5?
for a dual 1.8 the smallest step would be 450MHz up (changeing the multiplyer from 2 to 2.5) that would push it to 2.25 which is probably too much.

and for the 1.6 you could pust it to 2.0 (still a bit to high)

is anyone willing to try?

http://www.swieskowski.net/icook/
 
Sun Baked

Sun Baked

macrumors G5
May 19, 2002
14,937
157
Hector said:
i use a little kernal patch called icook and I know that the g5's have the same technology thats in the 750fx that my ibook has (i think it's called speedstep or somthing like that) and i'm wandering if anyone has tryed to use it on there g5?
for a dual 1.8 the smallest step would be 450MHz up (changeing the multiplyer from 2 to 2.5) that would push it to 2.25 which is probably too much.

and for the 1.6 you could pust it to 2.0 (still a bit to high)

is anyone willing to try?

http://www.swieskowski.net/icook/
Click to expand...
The multiplier is 1x, 2x, 3x, etc. -- whole numbers only.
 
Mord

Mord

macrumors G4
Original poster
Aug 24, 2003
10,091
23
UK
Sun Baked said:
The multiplier is 1x, 2x, 3x, etc. -- whole numbers only.
Click to expand...

where did you get the info from?

hmm mabey with a good watercooling set voltage tweaks and a peltier we could get to 3GHz with a dual 2GHz g5?
 
Sun Baked

Sun Baked

macrumors G5
May 19, 2002
14,937
157
Hector said:
where did you get the info from?

hmm mabey with a good watercooling set voltage tweaks and a peltier we could get to 3GHz with a dual 2GHz g5?
Click to expand...
Was in one on the PPC970 brochures from IBM concerning the FSB multiplier, of course IBM has done some housecleaning since then.
 
Mord

Mord

macrumors G4
Original poster
Aug 24, 2003
10,091
23
UK
Dreadnought said:
hmmm, iCook can only go till 1200 mhz... to bad.
Click to expand...

have you actually tryed it because i suspect that the 1200MHz limit is a limit of the chip muliplyer not the software
 
jared_kipe

jared_kipe

macrumors 68030
Dec 8, 2003
2,967
1
Seattle
well I tried it and it wouldn't run, the website says, "If this fails you probably do not have a 750FX CPU." Guess I don't have a 750FX
 
C

Crikey

macrumors 6502
Jan 14, 2004
356
0
Spencer's Butte, Oregon
Wow! That's nuts. If I owned a G5, I wouldn't risk it on an overclocking experiment. I think a dual G5 would be "fast enough" for my uses.

Thanks for telling us about the results of the experiment, though!


Crikey
 
Mord

Mord

macrumors G4
Original poster
Aug 24, 2003
10,091
23
UK
well the developer is on my ichat list now, so i'll have a word with him.

it might be because when the g5 lows down or speeds up it changes the pci multiplyer instead of the system bus multiplyer because makeing a 1GHz jump on the dual 2GHZ g5 wou;d be silly.

i'll see what the guy thinks
 
Sun Baked

Sun Baked

macrumors G5
May 19, 2002
14,937
157
It would be nice to see the technical reference on the PPC970, but I haven't seen any of that info surface yet.
 
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