vcore limit on 45ns procs, which reading to go off of

[francisA]

May be a dumb question so I apologize.

The E5200 has a 1.3625v published max vcore. Now if I go to the BIOS and set it to 1.3625, in Windows, it of course drops a little lower than than.

In order for me to get 1.3625v in XP, the BIOS vcore will need to be 1.3875v

My question is, which one should I use as reference when overclocking, the one in the BIOS or the one that XP apps (ie CPU-Z, Easytune, etc)?

Thanks

 

[ajaidevsingh]

BIOS

 

[Spicedaddy]

CPU-Z

 

[OCGuy]

Originally posted by: Spicedaddy
CPU-Z

This.

Your mobo may not be able to supply the exact voltage you set it to, which is why you see the difference.

 

[Gillbot]

bios

If you go by CPU-z, you run the risk of overvolting after coming off a full load situation. If you ever hard monitor voltage via a meter, you'd see this spike.

 

[Tempered81]

Originally posted by: Ocguy31

Originally posted by: Spicedaddy
CPU-Z

This.

+1

start a poll?

 

[BTRY B 529th FA BN]

Originally posted by: Gillbot
bios

If you go by CPU-z, you run the risk of overvolting after coming off a full load situation. If you ever hard monitor voltage via a meter, you'd see this spike.

Whats with all this "this" & "that" is this some sort of new internet lingo :disgust:

what type of voltage meter would you recommend for hard monitoring something like a PSU or Mobo?

 

[VirtualLarry]

I run my friend's E5200 at 1.4v actual (CPU-Z load). Something like 1.425v BIOS. IP35-E mobo, 4x1GB DDR2-667 @ 600, 300FSB, 3.75Ghz.

I say screw it, if 1.4v actual is hazardous to the chip, I'll buy him a new one. So far it seems just fine.

 

[aigomorla]

bios.

because electron migration doesnt require load.

 

[Gillbot]

Originally posted by: BTRY B 529th FA BN

Originally posted by: Gillbot
bios

If you go by CPU-z, you run the risk of overvolting after coming off a full load situation. If you ever hard monitor voltage via a meter, you'd see this spike.

Whats with all this "this" & "that" is this some sort of new lingo :disgust:

what type of voltage meter would you recommend for hard monitoring something like a PSU or Mobo?

Any brand name is usually good. As long as it's not some dime store cheap-o one. The hardest part is finding clip leads to make the small connections.

Something with a small insulated or shielded clip is recommended.
http://www.maplin.co.uk/images/Full/fe23a.jpg

 

[cmdrdredd]

NEVER rely on your BIOS to provide accurate vcore management. You set 1.4v and get 1.39v in your BIOS monitor fine, but as soon as you load up windows maybe it's 1.36v and NOT 1.39v so then you have a potential problem depending on your overclock.

So always read CPU-Z and what it says in windows at idle AND under load with all your cores 100% in prime95 or another burn program. You will notice vdroop unless you mod the motherboard to eliminate it.

It's very simple. If you set 1.4v in BIOS and under 100% load CPU-Z says 1.34v and the system is unstable you need more than 1.4v, not just more than 1.34v because your BIOS is set to 1.4v but obviously you aren't getting what you set due to droop. So you go to BIOS and set something higher than 1.4v which may be 1.42v for example giving you maybe 1.36v at load which may or may not be enough, that's for you to find out through testing.

If your BIOS says 1.4v and you set 1.4v I guarantee you aren't getting 1.4v under load with windows running.

 

[rge]

If the motherboard manufacturer follows intel specs, then bios setting vcore = max overshoot volts. And Voffset/drop from bios setting to idle + additional vdroop at load is so that overshoots will go no further than bios setting. For example 1.4 bios, cpuz idles at 1.38, and on load goes to 1.33. That would mean (providing mobo is following intel specs) that overshoot max volts is .07. Which means when a user set his bios at 1.4, voltage from spikes will be max 1.4.

Intel specs refer to bios setting, you can ask them, and they will tell you that. That being said, their specs are always conservative, and I would have no problem running at their max specs via cpuz with LLC enabled, so that load volts are at max specs, and overshoots are .07 over. But that is just my personal preference. Bios setting = max overshoot is fact.