whats the importance of power supply when i o'clock

h2sammo

Senior member
Dec 12, 2000
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i bought a Duron 750 and i can only overclock it up to 856 with 107*8. i cannot get anything above this number. I tried every possible combination, but its impossible. windows will only function without crashing at this speed.
does this happen becasue of my power supply (300 W, from my old 466 Compaq), or because the processor is not too good, and i should try another processor?
and if anybody knows more about the role of the power supply when o'clocking, please post some lines.

Duron @856
ABIT KT7A
512 sdram
geforce 2 gts 32 megs
water cooling @ ~30-35 celsius


 

o1die

Diamond Member
Jul 8, 2001
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I don't think getting a different power supply will help much. If your current setup is stable, I would save your money instead for an athlon or xp cpu. If your setup is rebooting or locking up ocassionally on it's own, then the power supply might be suspect.
 

h2sammo

Senior member
Dec 12, 2000
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i tried with the core at the max output. in my case that makes no diff. its weird, i know, but i dont know what to make of it??/
 

Insidious

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Oct 25, 2001
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You could try messing with your RAM settings. It might not be the CPU that is limiting you.



Also might want to make sure you are not enabling shadowing (system or video)
 

MilkPowderR

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Mar 30, 2001
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<< You could try messing with your RAM settings. It might not be the CPU that is limiting you.



Also might want to make sure you are not enabling shadowing (system or video)
>>



I strongly doubt it. Unless he's got 2 sticks of 256mb SDRAM= 512mb, he could try taking one of them out and try start it up. Other than that, your advice is not very good. The other person, Wind has gave him a lot better answer. Listen to him for advice. It is highly likely the CPU related. Its voltage and temperature is the critical part. Wind has lots of experience in computers and overclocking. Voltages of input and output coming from the bedroom wall to your PSU and to your computer system is also important. Don't listen to Insidious's advice. :eek:
 

Wind

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Jul 22, 2001
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<< any ideas? >>



How many stick of RAM u r using ? Wht's the rating of these RAM ?

It's good to have ur full spec.
 

h2sammo

Senior member
Dec 12, 2000
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i have 3 sticks of RAM

64 PC100
128 PC133
256 PC133

total 448

i tried to change the CAS to 2 or 3, but i have had the same reuslt with both tries

my full spec:

Duron 750 @856 (8*107)
Abit KT7A
448 SDRAM
GE Force 2 32 gts
SoundBlaster Sound Card
cable conn
water cooling
power suply..................i think its 300W, its from my old 466 Compaq

i hope this is about all

thx for the help guys.....(Wind)
 

Wind

Diamond Member
Jul 22, 2001
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<< i have 3 sticks of RAM

64 PC100
128 PC133
256 PC133

total 448
>>


Thts the probs! U mixed a different rated RAM. Here's some opinion: -
1. Try w/ the 256 PC133 RAM only (slot 1) & set ur multiplier to 7.0. Up the vcore to 1.75v. Up the FSB until the system becomes unstable. Should do 133 FSB by now.

2. Then try 2 stick 256 PC133 (slot1), 128 PC133 (slot 2). Repeat the "bold" writting steps. C if u can reach 133 FSB.

3. Then the PC100 (slot 3) & Repeat the "bold" writting steps. C if u can reach 133 FSB (most probably not).

Change the CAS to 3.
The sound card on PCI slot 3.



<< i think its 300W >>


Look at the sticker on the PSU...it should have written something. Anyway, try my suggestions first.

Post back ur result.
 

h2sammo

Senior member
Dec 12, 2000
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OK, here are my overclocking numbers.

I found out that as i oclock I can only use the FSB value that has a PCI bus of 33, maybe its related to the kind of memory
I have (PC133 in my case). I tried using PCI clocks higher than 33 but that limited my FSB clock to 107 max. My max speed before now was 856, or 8*107/37, and that just didnt satisfy me as a good oclcok for a Duron 750.

Now, after listening to Wind, I took out the 64 meg stick of PC100, so i am left with 386 megs of PC133. For some reason (lucky reson for that matter), I tried FSB freqs that pair with 33 PCI clocks. That enabled me to get much higher clock speeds, as you will see in my post.

I think its important for people that write about oclocking to explain that the PCI freq needs to be set in concordance with their memory, and not higher. I was not aware of this, and i tried to oclock my Duron with very little succes for months.
Ok, nuff talk. Here are my results.

For all following numbers, the memory used is 386 PC 133 sdram, 2 sticks, 1 of 256, and the other of 128.
Vcore set to 1.85, was afraid to try it lower, maybe i will do so in the future.

7*122/40= didnt boot
7*115/38=805 booted fine
7*117/39=819 not starting
7*116/38=812 works
7*118/38= dont work
7*115/36=805 works
7*116/36=812 works
7*117/36=820 stuck at MS Windows first page
7*117/35=820 dont boot at all

5*133/33=667 woeks
5.5*133/33=733 works
5.5*135/33=743 works
.
.
.
5.5*149/33=819 wont boot

6*133/33=800 works
.
.
.
6*143/33=858 works

6.5*133/33=866 works
6.5*144/33=936 works but got some errors in internet explorer 6.1(the last one) that i never got before. It basically said that it had problems, almost every time i was using it....no other problem though
6.5*145/33=943 error: scan registry error

7*133/33=933 works
7*134/33=938 works
7*143/33= error: Detecting Floppy Drive A media, INSERT DISK AND PRESS ENTER
7*135/33=945 error: in accessing system registry

8*117/33= wont boot
9*100/33=900 works fine
9*103/33=927 works
9*105/33=945 error: windows protect error
9.5*100/33=950 error: windows protect error

Right now im running 7*133/33=933.
Its intersting that for all these different clocks, i got similar, no, the correct term is exatcly teh same cpu temps. basically, now that i run at 933, and before, at 856, and at the lower clocksi tried, the temp is all the same, ~32 idle and ~50 celsius at max load (never saw any temp higher than that). Ahh, the power of water cooling (no fan on radiator).

ok, so pls let me know if you need know more. im sure i skipped a lot of stuff


 

Wind

Diamond Member
Jul 22, 2001
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h2sammo,
24% increase from the rated speed. I would complain coz thts Duron (splitfire) had the general limit of around 950-990 Mhz. My Duron 800@994 @ vcore 1.75v. Can do 1015 Mhz stable, but I just happy at 994.

Fr ur tread, I doubt tht ur PSU is 300W. Could u kindly check again. Its not ur PCI probs coz I can see u POST at 145 FSB. Windows reg errors could be due to CPU not getting sufficient power or too much fluctuation in power supplied. Wht's the voltage reading of the .3v, 5v & 12v rail during idle & f/load ?

Await ur reply.
 

h2sammo

Senior member
Dec 12, 2000
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voltage reading of the .3v, 5v & 12v rail during idle:


3.3V: 3.46
5V: 5.15 fluctuating with 5.03
12V: 11.71

poling at 2 seconds

As for the power supply, didnt check yet, i have to open my cover and take a look.
whereever its written, its not obvious, cuz i tried to see what power it has previosly, and i could not get to the end of it
ill try again tomorrow
 

h2sammo

Senior member
Dec 12, 2000
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voltage reading of the .3v, 5v & 12v rail during full load:


3.3V: 3.46
5V: 5.15 fluctuating with 5.03
12V: 11.71 , 11.89

poling at 2 seconds

as i was playing my game, the screen just went blank and the game shut down several times. it happens after like 20-30 min of play


 

Wind

Diamond Member
Jul 22, 2001
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Ur voltage rail is good...wht about the vcore voltage...fluctuate a lot during idle & f/load ?

I'm sorry for askin so many question coz O/Cing is not a guaranteed kinda of thing. Some ppl make it..some just don't. Apart from that, O/Cing limitation could be due to many thing. Fr PSU, RAM, CPU & so forth to how u arrange ur components in those PCI slots !

U really need to narrow down the possibility first.

Await reply.
 

cookieman

Senior member
Jun 12, 2001
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Nice job Wind! Nice to see you. Btw: i switched from Duron 750@936 to an Athlon 1@1.1 :)

I think he will see little vcore fluctuation because he mentioned the 5v rail fluctuating between 5.15 and 5.03. vcore fluctuation should be max 0.02v He should be stable by now at 933. That's a good speed for a Duron 750. :)

MilkPowderR: why are you angry at Insidious? He did give a good idea (RAM being the problem... ) to find the problem.

Cheers,

 

MilkPowderR

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Mar 30, 2001
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<< Nice job Wind! Nice to see you. Btw: i switched from Duron 750@936 to an Athlon 1@1.1 :)

I think he will see little vcore fluctuation because he mentioned the 5v rail fluctuating between 5.15 and 5.03. vcore fluctuation should be max 0.02v He should be stable by now at 933. That's a good speed for a Duron 750. :)

MilkPowderR: why are you angry at Insidious? He did give a good idea (RAM being the problem... ) to find the problem.

Cheers,
>>



Why would I go angry at him for no reason? Im not that stupid. There's reason behind it. He pissed me off in the other thread questioning me and being hard-ass about it. Unfortunately, the Moderator must have removed the section where he started the crap and my end of it. I believe it was in this thread: Here
 

h2sammo

Senior member
Dec 12, 2000
214
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my vcore doenst fluctuate, as far as i noticed so far

its at 1.92V

ill check the power supply output later today, i promise