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1090T CPU-NB speed: 2800mhz vs 3000mhz - Page 2

post #11 of 19
8/12/12 at 2:57pm
I agree with redwoods, probably just a lack of CPU/NB voltage. It's not uncommon for a Thuban to need 1.38 to 1.42v for 3000Mhz NB.
When you say it fails, what are you testing with (which program)?
Where is the Dram voltage set? Raising the NB Freq may require a slight boost in Dram voltage as well to help stabilize.
It's not uncommon for the AMD Platform to require a slight boost (maybe .05 to .1v) even to stabilize stock timings.
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post #12 of 19
8/13/12 at 5:13pm
Thread Starter 
Quote:
Originally Posted by The Sandman View Post

I agree with redwoods, probably just a lack of CPU/NB voltage. It's not uncommon for a Thuban to need 1.38 to 1.42v for 3000Mhz NB.
When you say it fails, what are you testing with (which program)?
Where is the Dram voltage set? Raising the NB Freq may require a slight boost in Dram voltage as well to help stabilize.
It's not uncommon for the AMD Platform to require a slight boost (maybe .05 to .1v) even to stabilize stock timings.

I use Prime95 blend test, it crashed as soon as I started it at 1.3v, at 1.26 PC crashed as soon as the desktop loaded, I guess more voltage will probably get it to stabilize (depending on temps). My RAM is currently at manufacturer settings (1600mhz, 9 9 9 24 timings, 1.50v).
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post #13 of 19
8/13/12 at 6:00pm
Quote:
Originally Posted by serbusfish View Post

I use Prime95 blend test, it crashed as soon as I started it at 1.3v, at 1.26 PC crashed as soon as the desktop loaded, I guess more voltage will probably get it to stabilize (depending on temps). My RAM is currently at manufacturer settings (1600mhz, 9 9 9 24 timings, 1.50v).

When you say crashed, was it a BSOD or a "Worker Has Failed" error in Prime95 where one or more workers just stop, showing errors?
When I test with Prime95 I follow these two rules,
A BSOD is usually due to a lack of Vcore,
A "Worker Has Failed" error is usually a lack of CPU/NB voltage or Dram voltage. Sometimes a combination of the two.

With your current settings for CPU/NB and Dram voltage it could be either one.
I would try raising the CPU/NB voltage in small amounts till you get up to 1.35 to 1.4v. (mine 4013 cpu with 3010 NB freq requires 1.402v CPU/NB) If by this point you don't see any better stability reduce it back to 1.35v and increase Dram voltage the same way (small amounts) to 1.55 to 1.6v. Get the idea?

Raising the CPU/NB voltage does add a small amount of heat but not nearly as much as added Vcore.
Dram voltage on an AMD platform is known to need a slight increase (usually .05 to .1v) above manufactures spec due to the voltage rating being for Intel usage.
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post #14 of 19
8/13/12 at 6:58pm
Thread Starter 
Quote:
Originally Posted by The Sandman View Post

When you say crashed, was it a BSOD or a "Worker Has Failed" error in Prime95 where one or more workers just stop, showing errors?
When I test with Prime95 I follow these two rules,
A BSOD is usually due to a lack of Vcore,
A "Worker Has Failed" error is usually a lack of CPU/NB voltage or Dram voltage. Sometimes a combination of the two.
With your current settings for CPU/NB and Dram voltage it could be either one.
I would try raising the CPU/NB voltage in small amounts till you get up to 1.35 to 1.4v. (mine 4013 cpu with 3010 NB freq requires 1.402v CPU/NB) If by this point you don't see any better stability reduce it back to 1.35v and increase Dram voltage the same way (small amounts) to 1.55 to 1.6v. Get the idea?
Raising the CPU/NB voltage does add a small amount of heat but not nearly as much as added Vcore.
Dram voltage on an AMD platform is known to need a slight increase (usually .05 to .1v) above manufactures spec due to the voltage rating being for Intel usage.

Ok thanks a lot for the advice, i'll give it a go and hope for the best smile.gif

Also no when i run Prime the system simply freezes, no BSOD, no errors, it just freezes (desktop stays on screen) and wont do anything.
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post #15 of 19
8/13/12 at 8:40pm
Quote:
Originally Posted by serbusfish View Post

Ok thanks a lot for the advice, i'll give it a go and hope for the best smile.gif
Also no when i run Prime the system simply freezes, no BSOD, no errors, it just freezes (desktop stays on screen) and wont do anything.

That sounds like Lack of Dram voltage, plain system freezing is usually (not always) Dram related.
I'm fairly sure you'll be doing the combination of both CPU/NB and dram voltage. 1.3v CPU/NB at 3000MHz is too low plus you have this freezing issue as well.
I'd start with 1.35 CPU/NB keeping in mind this is probably still too low and use 1.55v dram voltage, run prime95 if the freezing issues improves we'll know the added dram is needed.
If it's still an issue, give it a few more bumps and repeat test.
If you reach 1.6v dram voltage than try adding CPU/NB voltage in small increases. If your not aware max CPU/NB voltage for a Thuban is 1.5v so no need to worry even if it takes 1.4v. I run my 3211MHz NB with 1.442 in bios and under load spikes at 1.47 to 1.48v.
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post #16 of 19
8/14/12 at 9:42pm
Quote:
Originally Posted by Redwoodz View Post

Set it to 1.4175v and try again.

it's not really worth it for me to pump so much voltage in the cpu/nb since it's stable at 2925 at 1.3v. Of course... getting my ram to run at a decent speed right now is bloody impossible.
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post #17 of 19
8/21/12 at 1:59pm
Quote:
Originally Posted by hesho View Post

it's not really worth it for me to pump so much voltage in the cpu/nb since it's stable at 2925 at 1.3v. Of course... getting my ram to run at a decent speed right now is bloody impossible.

Then you would only need around 1.35v to run 3000MHz+.Also your RAM may need more IMC voltage to run higher speeds.
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post #18 of 19
12/14/12 at 4:25pm
I have read somewhere that any more than 1.25V on the Thuban memory controller is a bit of a no-no, apparently the North Bridge or IMC on the Thuban is uprated from the standard Phenoms, some anecdotal evidence for this is that when I set mine to 1.35 I was getting a machine check exception error in the event logs and random crashes, it stated AMD north bridge event id 14 failure. This suggests to me that too much voltage was being applied as these errors are thrown out by the CPU to say that something is outside of its normal operating parameters, I can't say definitively what the max voltage is on a Thuban but I really am starting to think it is not 1.55V as is banded about, my BIOS allows 1.55V on the cpu/nb without turning red but it could well have been optimised for the X4 chips, 1.25V for 2800mhz seems stable, it is possible that firing too much voltage into the NB is the problem and not the fact that there isn't enough.

BSOD's are often an indicator that more voltage is required for the CPU, but it seems some apply this logic to the NB overclock too, everything I have read suggests minimum stable voltage is best on the CPU/NB and not raising as high as possible, this is just my experience with trying to overclock the NB.

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post #19 of 19
12/14/12 at 5:42pm
My old 1090 would run 3000 MHz on the CPU/NB but I noticed no difference in gaming between it and 2800 MHz and didnt see much more than a couple frames in my averages in my benchmarks (Metro, Crysis, Batman AC) so I left it at 2800 so I could keep the voltage at 1.25 because I needed 1.32 to get 3000 stable and since I was running a Hyper 212+ back then, I needed to shave off a couple degrees.

One thing to try is to turn the HT Link down to 1800. It doesnt affect Phenom II's performance like it does Bulldozer so keep it down and it can add a little to your stability.
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