Asus P4C800 - Deluxe What is the highest Voltage I can run the vCore at Safely?

  • Thread starter Thread starter Golgatha
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Golgatha

I am running a P42.80c CPU on a Asus P4C800 Deluxe.
I want to know what the highest voltage is, that I can run it at
safely?..When I run it at stock voltage with a 235FSB, 5:4 divider the
system will run just fine..I can run Prime95 and memtest86 all day without a
problem,but when I am just sitting in windows with my browser open, and
doing nothing special the system will reboot after a long time running..
The temp of the CPU is cold, at 28c so,I would not think the teperature
could be the problem..
I also have a very high end PSU, Kingwin 450w, so I dont think the PSU could
be my problem..
So I was thinking that it might be the CPU voltage that is causeing the
reboots..Maybe I need to up the voltage?
So the question is,what is the highest voltage I can safely use with a
P42.80c?
And could the V core voltage being to low for the speed I am running my FSB
at "235", cause my rebooting problem? Thanks in advance
System :
Asus P4C800 - Deluxe
Pentium 4 2.80c Zelman CNPS7000-Cu
Mushkin PC 3500 Level II / 512x2
Radeon 9800 Pro
SB Audigy 2
 
So the question is,what is the highest voltage I can safely use with a
P42.80c?
Click to expand...

Why not try it? Small increases won't hurt. On my system increasing voltage
doesn't make my system more stable, I think it's because my PSU is not up to
the task.

I wouldn't go above 1.65 though.

I prefer to run it normally clocked with PAT - overclocking automatically
disables PAT, which sucks, because it improves memory throughput by nearly 1
GB/sec! And that is "free" performance increase which is not stressing my
CPU at all or causing instability, so I'm very happy with it.
 
"Darkfalz" said:
Why not try it? Small increases won't hurt. On my system increasing voltage
doesn't make my system more stable, I think it's because my PSU is not up to
the task.

I wouldn't go above 1.65 though.

I prefer to run it normally clocked with PAT - overclocking automatically
disables PAT, which sucks, because it improves memory throughput by nearly 1
GB/sec! And that is "free" performance increase which is not stressing my
CPU at all or causing instability, so I'm very happy with it.
Click to expand...

ftp://download.intel.com/design/Pentium4/datashts/29864311.pdf (pg.23)

" Table 2-5. Processor DC Absolute Maximum Ratings
Symbol Parameter Min Max Unit Notes
TSTORAGE Processor storage temperature ­40 85 °C 2
VCC Any processor supply voltage
with respect to VSS ­0.3 1.75 V 1
VinAGTL+ AGTL+ buffer DC input voltage
with respect to VSS ­0.1 1.75 V
VinAsynch_GTL+ Asynch GTL+ buffer DC
input voltage with respect
to VSS ­0.1 1.75 V
IVID Max VID pin current 5 mA

NOTES:
1. This rating applies to any processor pin.
2. Contact Intel for storage requirements in excess of one year. "

So, it looks like 1.75 is the absolute maximum you can use. For safety
I wouldn't go that far. 1.67V is the highest voltage used in the 19
entries for the 2.8C on http://www.cpudatabase.com/CPUdb

HTH,
Paul
 
Paul said:
ftp://download.intel.com/design/Pentium4/datashts/29864311.pdf (pg.23)

" Table 2-5. Processor DC Absolute Maximum Ratings
Symbol Parameter Min Max Unit Notes
TSTORAGE Processor storage temperature ­40 85 °C 2
VCC Any processor supply voltage
with respect to VSS ­0.3 1.75 V 1
VinAGTL+ AGTL+ buffer DC input voltage
with respect to VSS ­0.1 1.75 V
VinAsynch_GTL+ Asynch GTL+ buffer DC
input voltage with respect
to VSS ­0.1 1.75 V
IVID Max VID pin current 5 mA

NOTES:
1. This rating applies to any processor pin.
2. Contact Intel for storage requirements in excess of one year. "

So, it looks like 1.75 is the absolute maximum you can use. For safety
I wouldn't go that far. 1.67V is the highest voltage used in the 19
entries for the 2.8C on http://www.cpudatabase.com/CPUdb

HTH,
Paul
Click to expand...
Thanks Paul & Darkfalz, very useful information
By the way,PAT is still enabled.
I seemed to have found stability at 1.568 v
So far,no rebooting.. Ran it all day yesterday without a problem..
As long as the temp is below spec. "Right now at 30c at idle /40c at full
load".
Are you safe increasing voltage and FSB? thanks
 
Thanks Paul & Darkfalz, very useful information
By the way,PAT is still enabled.
Click to expand...

Are you basing that on your BIOS setting or something like Aida32 telling
you PAT is Enabled?
Are you safe increasing voltage and FSB? thanks
Click to expand...

Increasing FSB is always safe if you are stable, voltage is the only thing
to worry about, but remember that they are designed to cope with variances
in voltages due to different loads and power supples, so upping it slightly
wouldn't be a problem at all. Mine which is set to 1.55 varies in the
monitor from 1.50 to 1.57.
 
Darkfalz said:
Are you basing that on your BIOS setting or something like Aida32 telling
you PAT is Enabled?
Click to expand...
Actually I am basing that on a program called CPU- ZAre you safe increasing voltage and FSB? thanks
 
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