I just started running Prime 95 to see how stable my OC is and I noticed with Asus Probe that my +12V jumped up to 13.25V. Asus Probe has a default tolerence of +10% voltage to set off the alarm. Is this a problem or is 13.25V on my +12V line alright?
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+12 Volt Max Question
- Thread starter sipher
- Start date
mohammedtaha
2[H]4U
- Joined
- Oct 14, 2004
- Messages
- 3,648
no it's not alright that's over 10% even though ur psu should not go over or under 5 % .. that's a faulty PSU and u should either get it rma'd if it's a good brand. If it's generic then invest ur money into something of better quality
Ice Czar
Inscrutable
- Joined
- Jul 8, 2001
- Messages
- 27,174
1st software monitoring is next to useless for definitive values
so verify it with a multimeter
2nd it is useful for relative values however, if the total fluctuation is greater than 5% then you have an obvious problem
--------------------------------------------------------------------------------------------------------------------------
cut and paste
(SMBus = System Management Bus, where the BIOS and all other aps pull the value,
good for observing or logging fluctuations, not so good for definative values)
How to adjust your voltage lines (and list of psu's with internal pots) by computerpro3
of course you need a digital multimeter and you have to pop the top and void the warranty
(unless your real tricky and solvent the sticker off somehow)
why you want to have your rails as close to the baseline value as possible is
that your supply has a transient response of 5%, if the baseline is too high,
under some circumstances it might overshoot the allowed value in the spec,
even though its functioning within its own parameters,
if you have a supply with a tighter than spec transient response (load regulation) say 3% or 1%,
your able to bump the baseline voltage without fearing the overshoots
Basic 5% range is
+12V....11.4V to 12.6V
+5V......4.75V to 5.25V
+3.3V...3.135V to 3.465V
so verify it with a multimeter
2nd it is useful for relative values however, if the total fluctuation is greater than 5% then you have an obvious problem
--------------------------------------------------------------------------------------------------------------------------
cut and paste
(SMBus = System Management Bus, where the BIOS and all other aps pull the value,
good for observing or logging fluctuations, not so good for definative values)
How to adjust your voltage lines (and list of psu's with internal pots) by computerpro3
of course you need a digital multimeter and you have to pop the top and void the warranty
(unless your real tricky and solvent the sticker off somehow)
why you want to have your rails as close to the baseline value as possible is
that your supply has a transient response of 5%, if the baseline is too high,
under some circumstances it might overshoot the allowed value in the spec,
even though its functioning within its own parameters,
if you have a supply with a tighter than spec transient response (load regulation) say 3% or 1%,
your able to bump the baseline voltage without fearing the overshoots
Basic 5% range is
+12V....11.4V to 12.6V
+5V......4.75V to 5.25V
+3.3V...3.135V to 3.465V
Ok, now for some hard numbers.
Bios Monitor: Asus A7V 266 (Don't Laugh)
VCore: 1.63 V
+3.3V: 3.13 V
+5V: 4.703 V
+12V: 12.40 V
MB: 21 C
CPU: 34 C
Asus Probe:
VCore: 1.76 V
+3.3V: 3.136 V
+5V: 4.703 V
+12V: 12.992 V
MB: 21 C
CPU: 34 C
That is not under load. When running Prime 95 here are the Asus Probe readings.
VCore: 1.776 V
+3.3 V: 3.12 V
+5 V: 4.869 V
+12 V: 13.248 V
MB: 21 C
CPU: 40 C
So it's really only increasing 0.256 V under load of Prime 95. Should I be worried about the change or worried about the max that it's running at? This information may help a little more than my first post.
Bios Monitor: Asus A7V 266 (Don't Laugh)
VCore: 1.63 V
+3.3V: 3.13 V
+5V: 4.703 V
+12V: 12.40 V
MB: 21 C
CPU: 34 C
Asus Probe:
VCore: 1.76 V
+3.3V: 3.136 V
+5V: 4.703 V
+12V: 12.992 V
MB: 21 C
CPU: 34 C
That is not under load. When running Prime 95 here are the Asus Probe readings.
VCore: 1.776 V
+3.3 V: 3.12 V
+5 V: 4.869 V
+12 V: 13.248 V
MB: 21 C
CPU: 40 C
So it's really only increasing 0.256 V under load of Prime 95. Should I be worried about the change or worried about the max that it's running at? This information may help a little more than my first post.
BillR
Born Again Cynic
- Joined
- Feb 17, 2002
- Messages
- 18,535
I'd want to take a real reading with a voltmeter before I did anything else. Voltage at idle and voltage at full load.
You really can't do much but assume without the real numbers.
Luck
You really can't do much but assume without the real numbers.
Luck
Ice Czar
Inscrutable
- Joined
- Jul 8, 2001
- Messages
- 27,174
got your PM
as BillR points out
right know its all guess work, the two software aps are interpreting the value differently
while no fluctuation would be ideal, thats not all that much, but where the real baseline is, is a concern
keep in mind Prime 95 isnt a real test, its simply maxing out one component
where youll see the greatest fluctuation is when going from near to no load to near full load on the CPU\GPU and then spinning up an optical, or from that to next to nothing
transient response is measured in miliseconds for a 20% load change, often a good test of it is indirectly with the AC Line rugulation, as the supply has to deal with a brownout, with the lower voltage it needs to draw more AC amps, convert them and yet still maintain a stable DC load
as BillR points out
right know its all guess work, the two software aps are interpreting the value differently
while no fluctuation would be ideal, thats not all that much, but where the real baseline is, is a concern
keep in mind Prime 95 isnt a real test, its simply maxing out one component
where youll see the greatest fluctuation is when going from near to no load to near full load on the CPU\GPU and then spinning up an optical, or from that to next to nothing
transient response is measured in miliseconds for a 20% load change, often a good test of it is indirectly with the AC Line rugulation, as the supply has to deal with a brownout, with the lower voltage it needs to draw more AC amps, convert them and yet still maintain a stable DC load