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Overclock Query. OC + Undervoltage.

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lhgpoobaa   06-13-2002 at 02:23:08 AM

i have a curious question that you overclockers out there may (or maynot) be able to answer.

in your experience, is there any correlation between theoverclockability of a specific CPU and its ability to run at stock speeds BELOW the stock voltage?

note: this applies to both amd & intel cpu's.

i know my now retired tbird 1200C could only reliably do 1400, and at 1200 it would only undervolt to around 1.70-1.71 volts (full load of course)

anyone else?
highly overclockable XP's or 1.6A's?


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Anonymous   06-13-2002 at 03:51:03 AM
- 0 +

i have made the test with my thunderbird 1.3C and i found a stable 1.70 undervoltage run at stock speed.

Reply to Anonymous
lhgpoobaa   06-13-2002 at 01:19:41 PM
- 0 +

and the highest OC u got on it?

with my new AGOGA XP1800+ im running stable at 1.68-1.70 (variability of MBM) and 1hour of Toast.
havnt done overclocking on this core though

<font color=purple>All advice I offer has been
Audited by Arthur Anderson.</font color=purple>

Reply to lhgpoobaa
Anonymous   06-13-2002 at 03:02:54 PM
- 0 +

1.621 Mhz but what is "AGOGA"?


<P ID="edit"><FONT SIZE=-1><EM>Edited by corsair3200 on 06/13/02 09:03 AM.</EM></FONT></P>

Reply to Anonymous
FatBurger   06-13-2002 at 06:09:39 PM
- 0 +

All Athlon processors have a different 4 to 5 letter code starting with the letter 'A' written on the top. My old Tbird was an AVIA, though AXIA was more common (and better) around that time.

Newer cores typically reach higher clocks.

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Reply to FatBurger
lhgpoobaa   06-14-2002 at 02:33:06 AM
- 0 +

hey fatty... what about you! you own a 1.6A dontcha?
whats the lowest voltage u can use at stock speeds?

<font color=purple>All advice I offer has been
Audited by Arthur Anderson.</font color=purple>

Reply to lhgpoobaa
Kelemvor   06-14-2002 at 03:30:10 AM
- 0 +

Theoretically, it should. That's obvious to anyone who knows why you increase the voltage in the first place. However, there are always things that will affect this (a.k.a. problems with the chip fab, etc.). Well, I guess I'll take that back, if the chip fab was bad, you should have equal problems overclocking it as you do "undervolting" it. It's all based on the same theory. There's an astoundingly good review I read once of how to overclock and why you increase the voltage (even taught me some things I didn't know before), but I have no idea where it was. Try doing a google search for the article (something like "how to overclock" might work). Again, I would say that the answer to your question is yes, it should be an indicator of overclocking performance.

She said "I love a man in tight jeans" and I said "They're not supposed to be tight I just got fat."

Reply to Kelemvor
baldurga   06-14-2002 at 09:44:16 AM
- 0 +

Well, I drop the voltage for another reason but can help. I have a 1.2 Tbird and, because I wanna run it as cool as posible (don't ask, just hot weather and bad air flow, not a good combination). The mobo is an Epox 8KHA+ and allows me to put up to -0.1, so now it runs at 1.68 (the 0.03 plus I think it's for PSU miscalibration). No problems at all.

On the other side I just can tell you that runs ok at 1.33, but haven't overclock the voltage yet, but I can assure that at 1.4 and 1.75 it's unstable.

Now generally and as others say, seems logic that the lower the volts a CPU can run stable, means more quality, less "impurities" in it, so need also less voltage when overclocking. As far as I konw, increase voltage reason is make the electrical signal "jump" correctly throw a not so perfect specific gate by giving more power. Sorry if this explanation seems anything but technically accurate, but that's not my field. Hope I have made my point clear.

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Reply to baldurga
lhgpoobaa   06-14-2002 at 12:55:02 PM
- 0 +

indeed

thus i wanted to know if there was any kind of correlation, or if there was a practical lower limit

not too long ago there was this guy on these forums complaining that his Duron 1.2 or 1.3 was running at 1.4volts!
dunno how true it was though...

more info on my XP1800+ AGOGA
on bootup tonite i lowered the voltage by 0.025v to 1.675 Volts, which gives me a MBM reading that flickers between 1.66 and 1.68.

20mins of toast, 1 run of prime95 and an hour of 100% cure for cancer and its still running fine :)

<font color=purple>All advice I offer has been
Audited by Arthur Anderson.</font color=purple>

Reply to lhgpoobaa
FENRlZ   06-14-2002 at 01:09:02 PM
- 0 +

I think that guy was me, I didn´t return it, and yes my 1,3GHz Duron is still running at 1,45v, has been for a few months now. It´s very cool too 28°C-32°C with a 12$ HSF and no case fans.

The reason I was complaining was because I thought it was a bad CPU, since it was at 1,45v instead of 1,75v (maybe it couldn´t take much power, and therefore be a bad overclocker). I was about to return it and get a new one, but it´s working perfectly!

Reply to FENRlZ
lhgpoobaa   06-14-2002 at 01:34:56 PM
- 0 +

hehe yeah.
twazz you!

lucky bugger!
:smile:

did u verify those voltages in the bios or motherboard monitor?

wonder how low i can get my XP?

<font color=purple>All advice I offer has been
Audited by Arthur Anderson.</font color=purple>

Reply to lhgpoobaa
FENRlZ   06-14-2002 at 01:42:54 PM
- 0 +

1,45v is posted in BIOS under "System Health" and also displayed in Motherboard Monitor. 1,45v is the default voltage for the CPU, I can set it as high as 1,85v in BIOS, but 1,45v is selected when I set the voltage to auto. I believe it´s true, the displayed BIOS and MBM readings follow, when I set the vcore to something else.

Reply to FENRlZ
lhgpoobaa   06-14-2002 at 01:48:17 PM
- 0 +

impressive.

1.45v is pretty impressive

i just wonder why your motherboard is defaulting to that voltage. strange.

shouldnt complain though, u probably have the coolest duron on the planet :lol:

<font color=purple>All advice I offer has been
Audited by Arthur Anderson.</font color=purple>

Reply to lhgpoobaa
FENRlZ   06-14-2002 at 02:41:58 PM
- 0 +

It´s not really a big deal, who cares if the CPU is running at 32°C or 45°C anyways? As long as it´s running stable and can perform the tasks you want. I´m sure other Durons can also run at a 1,45v, there´s nothing special about the one I have, aside from the default voltage being 1,45v. Maybe all the Durons with the Morgan core can run on a low voltage?

Reply to FENRlZ
lhgpoobaa   06-14-2002 at 02:55:45 PM
- 0 +

nods
true enuf
but low temps help when u encounter really naster summer days, like i do here.

my record is a room temp of 32C!
absolute bastard of a day that was.


and u know that your supreme low voltage suggests that you can overclock that duron well dont u?

<font color=purple>All advice I offer has been
Audited by Arthur Anderson.</font color=purple>

Reply to lhgpoobaa
FatBurger   06-14-2002 at 05:51:31 PM
- 0 +

The lowest setting I have available I think is 1.4. I haven't tried anything lower than 1.5 though.

<font color=blue>Hi mom!</font color=blue>

Reply to FatBurger
phsstpok   06-15-2002 at 01:06:51 AM
- 0 +

I remember reading several claims in the forums at <A HREF="http://www.overclockers.com.au" target="_new">http://www.overclockers.com.au</A> that the old Tbird AXIA core overclocked a little better when undervolted in the 1.68 volt range. It didn't work with my AYHJAR which doesn't like undervolting at all.

<b>I have so many cookies I now have a FAT problem!</b>

Reply to phsstpok
lhgpoobaa   06-15-2002 at 04:09:20 AM
- 0 +

interesting and thanx

im a occasional memeber of that forum, being an auzzie, so i will ask there too.

even better luck today
booted up my system with only 1.65v and it STILL seems stable.


<font color=purple>All advice I offer has been
Audited by Arthur Anderson.</font color=purple>

Reply to lhgpoobaa
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