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Overclocking 1090T to 4ghz getting to high voltage

post #1 of 72
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Specs:
AMD Phenom II 1090T BE / Corsair H100
MSI 890FXA-GD65
4x4gb G skills Ripjaw 1600 (9-9-9-24-2n)
2 x XFX 6870 1gb 950/1200
CM Storm Trooper case (with corsair H100 as my top exhaust, this case is quiet)
850W Thermaltake TK-RX2

I've disabled cool n quite, turbo core, c1e, spread spectrum.
I left everything on auto except for the CPU ratio at x20 and stock cpu voltage on my mobo is at 1.425v but idle at 1.488v. When prime95 is running, I was getting around 1.55v to 1.58v. My temp is around 41C at max and 38C average... What should I do? is this the max voltage I can get my CPU to do? T^T
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Storm-X7-Trooper
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post #2 of 72
Quote:
Originally Posted by beastmith View Post

Specs:
AMD Phenom II 1090T BE / Corsair H100
MSI 890FXA-GD65
4x4gb G skills Ripjaw 1600 (9-9-9-24-2n)
2 x XFX 6870 1gb 950/1200
CM Storm Trooper case (with corsair H100 as my top exhaust, this case is quiet)
850W Thermaltake TK-RX2
I've disabled cool n quite, turbo core, c1e, spread spectrum.
I left everything on auto except for the CPU ratio at x20 and stock cpu voltage on my mobo is at 1.425v but idle at 1.488v. When prime95 is running, I was getting around 1.55v to 1.58v. My temp is around 41C at max and 38C average... What should I do? is this the max voltage I can get my CPU to do? T^T

you dont want to auto set any of your voltages as they tend to be way more than necessary.
set your vcore to 1.4 and test for stability. if stable lower until unstable then go one notch back.
if not stable, increase until stable making sure to not exceed 1.5v (unless you got guts and cooling)
for a nice performance boost after you find your stable cpu voltage try:
- manually set your hypertransport to 2000Mhz (this is debatable by some but i set mine at 2000)
- set northbridge frequency to 2600Mhz (goal is 3000Mhz if stable)
-set cpu-nb voltage to 1.25 at 2600Mhz. if unstable increase until 2600 is stable.
you ultimately want to get to 3000Mhz northbridge but absolutely dont go past 1.4 cpu-nb voltage.
post #3 of 72
I remember I was running my 1090t at 3.8Ghz with 1.62v
It was a very bad clocker but perform very well under this speed and volts.
as long you confident with present temperatures you good to go... but I agree that anything over 1.55volts for AMD is "Suicidal Tendentious"
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post #4 of 72
Thread Starter 
I have to settings for Vcore, one is CPU VDD voltage and CPU Voltage. Im guessing that CPU VDD is what my voltage on idle and if i change CPU voltage, it starts at 1.425v then I can increase it.. though increase CPU voltage from stock to like 1.45v gets me around ~1.6v under load with prime95.
Quote:
Originally Posted by LilScrappyD View Post

- set northbridge frequency to 2600Mhz (goal is 3000Mhz if stable)
-set cpu-nb voltage to 1.25 at 2600Mhz. if unstable increase until 2600 is stable.

I got confused.. so I have to set CPU-nb voltage to 1.25v then increase CPU-NB freq to 2600, and if unstable?? i still should increase it?
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post #5 of 72
Quote:
Originally Posted by beastmith View Post

I have to settings for Vcore, one is CPU VDD voltage and CPU Voltage. Im guessing that CPU VDD is what my voltage on idle and if i change CPU voltage, it starts at 1.425v then I can increase it.. though increase CPU voltage from stock to like 1.45v gets me around ~1.6v under load with prime95.
I got confused.. so I have to set CPU-nb voltage to 1.25v then increase CPU-NB freq to 2600, and if unstable?? i still should increase it?

Set your NB to 2600, then voltage to 1.25

If 1.25 is not enough, increase it until you are stable
post #6 of 72
Quote:
Originally Posted by beastmith View Post

I have to settings for Vcore, one is CPU VDD voltage and CPU Voltage. Im guessing that CPU VDD is what my voltage on idle and if i change CPU voltage, it starts at 1.425v then I can increase it.. though increase CPU voltage from stock to like 1.45v gets me around ~1.6v under load with prime95.
I got confused.. so I have to set CPU-nb voltage to 1.25v then increase CPU-NB freq to 2600, and if unstable?? i still should increase it?

Yes,you are safe on CPU NB up to 1.4v generally. Leaving CPU voltage on auto, or overclocking on auto will cause the CPUv to fluctuate. The higher you clock the CPU the higher the CPUv will be with voltage set on auto. Also you have LLC, or load-leveling, which will affect the VDROOP. This will cause a 1.45 CPUv setting to raise to 1.5v (example, varies per motherboard).Can't remember the LLC adjustments on the MSI FX series, but you should be able to disable LLC or adjust it if needed.

One thing I will mention, especially since you are using a watercooling solution. Make sure you have airflow over the VRM's. Quiet PC cases are typically hot PC cases, and you don't have a fan over the CPU blowing air past the VRM's. With dual 6870's you are pumping some heat inside that case. The hotter your VRM's get, the more VDROOP you will get. You also have a mobo that has been known to catch on fire when the VRM's don't get enough cooling. Can't stress enough the need for proper cooling when overclocking an X6 CPU.
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post #7 of 72
Thread Starter 
thanks Ill try that.

No one has not answered this question, there are two different voltages on my bios one has a "VDD" with the phrase and the other does not.
CPU VDD voltage
CPU Voltage
CPU NB VDD voltage
CPU NB voltage

Which one should be changed?
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post #8 of 72
^this.
and then try to go to 2800 then 3000 on cpu-nb frequency.
dont go over 1.4v cpu-nb doing it.
some can get to 3000, some cant.
i hit a wall at 2800 and require more than 1.4 to go higher.
i would look into getting your cpu stable first.
post #9 of 72
Thread Starter 
Quote:
Originally Posted by Redwoodz View Post

Yes,you are safe on CPU NB up to 1.4v generally. Leaving CPU voltage on auto, or overclocking on auto will cause the CPUv to fluctuate. The higher you clock the CPU the higher the CPUv will be with voltage set on auto. Also you have LLC, or load-leveling, which will affect the VDROOP. This will cause a 1.45 CPUv setting to raise to 1.5v (example, varies per motherboard).Can't remember the LLC adjustments on the MSI FX series, but you should be able to disable LLC or adjust it if needed.
One thing I will mention, especially since you are using a watercooling solution. Make sure you have airflow over the VRM's. Quiet PC cases are typically hot PC cases, and you don't have a fan over the CPU blowing air past the VRM's. With dual 6870's you are pumping some heat inside that case. The hotter your VRM's get, the more VDROOP you will get. You also have a mobo that has been known to catch on fire when the VRM's don't get enough cooling. Can't stress enough the need for proper cooling when overclocking an X6 CPU.

I don't think I have LLC on this motherboard bios. So you want me to changed the CPU "VDD" voltage at 1.45v and leave CPU voltage at auto? Btw I have two intake fans infront, and they do push air a lot.. is that good enough?
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post #10 of 72
Quote:
Originally Posted by beastmith View Post

thanks Ill try that.
No one has not answered this question, there are two different voltages on my bios one has a "VDD" with the phrase and the other does not.
CPU VDD voltage
CPU Voltage
CPU NB VDD voltage
CPU NB voltage
Which one should be changed?

leave vdd voltages on auto.
only set your cpu and cpu nb voltages.

according to this:http://www.overclockers.com/forums/showthread.php?t=614336
CPU Vdd Voltage: This is the positive voltage supplied to the FETs. MSI states (on another 790FX board with Phenom II) that 1.3 to 1.4V is typical safe value, however we've increased it here because we've added additional cooling to the CPU socket area with two large fans.

CPU-NB Vdd Voltage: This can also help with increasing the integrated memory controller overclock - we've not increased it here, but considering AMD claims 1.4 to 1.5V for the CPU-NB core for optimum results, the CPU-NB Vdd should also be ~1.3 to 1.4V.

^i have no idea as to the credibility of this information as i have no personal experience working with vdd voltages.
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