CPU-NB Voltage?

5659 Views 52 Replies 11 Participants Last post by terence52, Dec 11, 2009

Zeifer

Discussion Starter · Dec 5, 2009

I'm just curious about how high I can push the voltage on the CPU-NB because the IMC on my chip is the only thing stopping me from clocking it like crazy.

It's currently at 0.375v above stock (not sure what stock is, AOD says 1.750 but it also says the vcore is 1.425v and is at the top of the slider even though it's at 1.475), and 0.4v and above is marked as red in my BIOS.

Going from no increase to that 0.375v allowed me to break the 3.6GHz barrier.

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Tator Tot

· #2 · Dec 5, 2009

1.325v is stock

So right now you are at
1.7v according to what stock is.

That's way to high though. And I think something is up.
Or you are just saying it wrong. What are you overclocking with?

Either way, max CPU-NB voltage is 1.55v unless you have a a CPU-NV VDD option in your BOIS or one like it, which allows you to go over the AMD spec for LN2/Phase/DICE runs.

Zeifer

Discussion Starter · #3 · Dec 5, 2009

Quote:

Originally Posted by Tator Tot

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1.325v is stock

So right now you are at
1.7v according to what stock is.

That's way to high though. And I think something is up.
Or you are just saying it wrong. What are you overclocking with?

Either way, max CPU-NB voltage is 1.55v unless you have a a CPU-NV VDD option in your BOIS or one like it, which allows you to go over the AMD spec for LN2/Phase/DICE runs.

Well AOD says my stock CPU-NB voltage is 1.175v. I'm inclined to believe it since it also accurately showed my stock vcore at 1.425v, and the stock voltage on my RAM of 1.8v.

So, 1.175 + 0.375 = 1.55v.

I'm overclocking via BIOS, and there's no display for the voltage for it.

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Tator Tot

· #4 · Dec 5, 2009

Ah alright.

Stock CPU-NB Voltage & CPU Voltage are supposed to be the same values. Which is odd.

More so because stock CPU Voltage for your CPU is 1.325. Not 1.425

Butmuncher

· #5 · Dec 5, 2009

2

Quote:

Originally Posted by Zeifer

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I'm just curious about how high I can push the voltage on the CPU-NB because the IMC on my chip is the only thing stopping me from clocking it like crazy.

It's currently at 0.375v above stock (not sure what stock is, AOD says 1.750 but it also says the vcore is 1.425v and is at the top of the slider even though it's at 1.475), and 0.4v and above is marked as red in my BIOS.

Going from no increase to that 0.375v allowed me to break the 3.6GHz barrier.

I take it thats a typo, 1.750v for cpu-nb, did you mean 1.175v?

Hi, never in a million years would i trust aod for accurate readings, especially cpu-nb, saying this as the last 2 mobo's ive had aod has allways reported the wrong cpu-nb as 1.175, even if i'd set it to 1.3v in bios aod still showed 1.175v.
Be warned you could easily blow your cpu up by upping the volts in aod.
@Bios is where its at

Nevr found concerete evidence of what the max cpu-nb is, evidence has allways come from users stating what they believe or have heard, would be gratefull if somebody can show 100% via a link ect what the max cpu-nb is.

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Zeifer

Discussion Starter · #6 · Dec 5, 2009

2

Quote:

Originally Posted by Butmuncher

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I take it thats a typo, 1.750v for cpu-nb, did you mean 1.175v?

Hi, never in a million years would i trust aod for accurate readings, especially cpu-nb, saying this as the last 2 mobo's ive had aod has allways reported the wrong cpu-nb as 1.175, even if i'd set it to 1.3v in bios aod still showed 1.175v.
Be warned you could easily blow your cpu up by upping the volts in aod.
@Bios is where its at

Nevr found concerete evidence of what the max cpu-nb is, evidence has allways come from users stating what they believe or have heard, would be gratefull if somebody can show 100% via a link ect what the max cpu-nb is.

Yeah, typo. I meant 1.175v. The motherboard turns red at values above 0.375v increase, so 1.175 + 0.375 = 1.55v, which would be the max as Tator Tot stated.

I would love to know how high I can safely crank it, because this chip could soooooo hit 4GHz stable if I could get the CPU-NB high enough.

Also, I never overclock in AOD, I use BIOS.

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Tator Tot

· #7 · Dec 5, 2009

Quote:

Originally Posted by Butmuncher

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Nevr found concerete evidence of what the max cpu-nb is, evidence has allways come from users stating what they believe or have heard, would be gratefull if somebody can show 100% via a link ect what the max cpu-nb is.

It's the same Voltage as the CPU Voltage Max 1.55 each.

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Butmuncher

· #8 · Dec 5, 2009

Quote:

Originally Posted by Tator Tot

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It's the same Voltage as the CPU Voltage Max 1.55 each.

Hi dude, sorry but do you have a link?

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Tator Tot

· #9 · Dec 5, 2009

Quote:

Originally Posted by Butmuncher

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Hi dude, sorry but do you have a link?

Depends, would you like Professional Overclockers words? IE: The guys that got to dice the first Phenom II TWKR chips?

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Zeifer

Discussion Starter · #10 · Dec 5, 2009

I thought 1.55v was the max recommended voltage on air cooling?

kstud

· #11 · Dec 5, 2009

Most recommend keeping the CPU-NB Voltage at or below 1.40V and CPU voltage at or below 1.55V.

On another note, why would you need to go above 1.4v of the CPU-NB volt unless you were trying for some insane NB overclock?

I'm at 1.15v and hitting 2400NB, [email protected], and [email protected]

EDIT: this is on a 965 C3

Tator Tot

· #12 · Dec 5, 2009

Quote:

Originally Posted by kstud

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Most recommend keeping the CPU-NB Voltage at or below 1.40V and CPU voltage at or below 1.55V.

On another note, why would you need to go above 1.4v of the CPU-NB volt unless you were trying for some insane NB overclock?

I'm at 1.15v and hitting 2400NB, [email protected], and [email protected]

EDIT: this is on a 965 C3

I just boosted mine to 1.4v

I've taken it to 1.55v before to see if I could go over 3000mhz NB..but I wasn't.

HT 300
RAM Speed 1600mhz
Cas Rating 7-7-7-20-1T
NB Frequency 2700mhz
CPU Frequency 4200mhz
HT Link Width 16/16
HT Link Speed 2100mhz
RAM Voltage 1.75
CPU Voltage 1.475
CPU-NB Voltage 1.4

That's what I got on my C3

Though, a few people here have noticed that to much voltage to the CPU-NB can cause instability instead of solving it it.

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Tator Tot

· #13 · Dec 5, 2009

Quote:

Originally Posted by Zeifer

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I thought 1.55v was the max recommended voltage on air cooling?

1.55V for both is AMD's max spec.

This is why some boards don't allow over that unless you use the CPU VDD Voltage options

Though, you can go higher, the belief is that electromigration and degrade will happen at higher voltages.

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kstud

· #14 · Dec 5, 2009

Tator Tot,

You need 1.4v to hit 2700NB?

Have you tried lower?

My 24/7 clock:
[email protected] 1.36v, CPU-NB [email protected] (prime95 blend 8hrs stable)

I can go [email protected], [email protected] stable but don't really notice a difference between the 2 clocks.

EDIT: This is with the board in the sig and DDR2

Tator Tot

· #15 · Dec 5, 2009

I just bumped mine to 1.4v off the bat.

I haven't had a chance to tweak it yet. So it's sitting 24/7 LinX stable at that. So I'm not worried.

I'll probably lower it once I have a chance during winter break. Providing life doesn't send me another curveball.

kstud

· #16 · Dec 5, 2009

Quote:

Originally Posted by Tator Tot

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I just boosted mine to 1.4v

I've taken it to 1.55v before to see if I could go over 3000mhz NB..but I wasn't.

HT 300
RAM Speed 1600mhz
Cas Rating 7-7-7-20-1T
NB Frequency 2700mhz
CPU Frequency 4200mhz
HT Link Width 16/16
HT Link Speed 2100mhz
RAM Voltage 1.75
CPU Voltage 1.475
CPU-NB Voltage 1.4

That's what I got on my C3

Though, a few people here have noticed that to much voltage to the CPU-NB can cause instability instead of solving it it.

With that high HTT and clock is it prime95 blend stable?

I find that prime95 blend to be one of the best test of system stability. I run IBT, OCCT, Linx for quick and dirty estimates and prime95 blend for an overall system stability testing NB, RAM, and cpu (minimum 3hrs).

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Tator Tot

· #17 · Dec 5, 2009

Quote:

Originally Posted by kstud

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With that high HTT and clock is it prime95 blend stable?

I find that prime95 blend to be one of the best test of system stability. I run IBT, OCCT, Linx for quick and dirty estimates and prime95 blend for an overall system stability testing NB, RAM, and cpu (minimum 3hrs).

Well so far it did a day of OCCT, LinX, & S&M.

Haven't had a chance to do a 24/7 run of Prime 95, but it's currently on a 24/7 fold stable.

So I'm not worried about it.

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Butmuncher

· #18 · Dec 5, 2009

2

Quote:

Originally Posted by Tator Tot

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Depends, would you like Professional Overclockers words? IE: The guys that got to dice the first Phenom II TWKR chips?

Hi, i was looking for something like this http://products.amd.com/en-us/Deskto...f10=&f11=&f12=
I know what the oc'ers say and i do believe

, was just wondering if amd had a chart that mentioned cpu-nb volts seperatly.

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Tator Tot

· #19 · Dec 5, 2009

2

Quote:

Originally Posted by Butmuncher

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Hi, i was looking for something like this http://products.amd.com/en-us/Deskto...f10=&f11=&f12=
I know what the oc'ers say and i do believe

, was just wondering if amd had a chart that mentioned cpu-nb volts seperatly.

Not that I have seen yet.

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Butmuncher

· #20 · Dec 5, 2009

2

Quote:

Originally Posted by Tator Tot

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Not that I have seen yet.

Same here dude .
For reference though you can see what i run mine at in my sig

, and i ned it at them volts on cpu-nb to boot at these speeds.

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