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Sabertooth 990FX and Phenom II x6 1045T - OC

post #1 of 22
Thread Starter 
Hi, all!!!

I've recently installed Phenom II x6 1045T (2700 Mhz) on Asus Sabertooth 990FX (bios is updated to 1102) with AMD memory Perfomance Edition 2x4GB 1600Mhz, 8-9-8-24, 1.65V.

Faced a strange FSB overclocking wall - having reached 286Mhz on FSB (resulting CPU - 3860Mhz, NB - 2565Mhz, HT - 2000Mhz) at 1.32V for CPU and 1.15V for NB (DDR3 is running 1525Mhz at 8-9-8-24, 1T) - I've got fully STABLE system under OCCT and LinX smile.gif

But increasing for 1 extra Mhz for FSB (287Mhz) results in system boot fail, although NB, HT, RAM is set to 1143Mhz (minimum) and timings are released. The voltage was bumped to 1.4V for CPU and +10% for VDDA, VDDR, DRAM etc.

Specific Asus features were set as following:
C.Probe Thermal
Phase Control - Standart
CPU Capability - 130%
NB Capability - 120%
Spread Spectrum, C1E, Turbo Core, C&Q - Disabled.

I don't know what to do in order to OC CPU more, taking into account, that my 1045T easily reached 3860Mhz on slight voltage increase (1.32V). I suspect RAM to be hitting the wall of FSB 287Mhz, despite of low frequency (1143Mhz) and high timings. But I am not sure...
Edited by Shtopor - 5/3/12 at 5:07am
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post #2 of 22
Have you checked the NB voltage? Increasing that might increase stability. Also, when you say that 286 is stable, do you mean that Prime95 runs for a few hours, or some other benchmarking program?

I'm not entirely sure that it's the RAM. If it is, and given that RAM is rated 1600, you can probably warranty exchange it.
post #3 of 22
Thread Starter 
Droviin
I've tested 1 hour in OCCT and 10 cycles in LynX.
RAM easily works at 1600Mhz 8-9-8-24 even at 1.5V (however it's stated 1.65V) when FSB frequency is less than 286 Mhz.
When setting FSB 286+Mhz, and lowering NB, HT, RAM to minimum (less than 1200Mhz) - system boot fails.

As I understood - there's a difference for RAM to run at frequency 1600Mhz:
1. 200Mhz FSB x 8 RAM multiplier = 1600
2. 300Mhz FSB x 5.33 RAM multiplier = 1600
no matter of timings and voltages...

Maybe there is an option, that I've missed while overclocking, or it's just BIOS bug, I don't know.
Edited by Shtopor - 5/3/12 at 4:39am
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post #4 of 22
Do you have any backup RAM that you could test in the system? Just so you can verify that it's not bad RAM.

Another trick would be to ensure that you have the most recent BIOS. The more recent versions generally have improved OC capability.

Sometimes FSB just hits an upper wall for overclocking. When you max that out, you switch to multiplier OC and RAM timings. Individual motherboards have OC more or less. I've heard that the maximum for FSB increase isn't as high as one might think; but you're getting a 43% increase, which is fairly good.
post #5 of 22
Thread Starter 
Quote:
Originally Posted by Droviin View Post

Do you have any backup RAM that you could test in the system? Just so you can verify that it's not bad RAM.
I also think it is not the bad RAM - it's not "overclockable" maybe. I don't have any other RAM to test. I thought, if there is any RAM secondary timings or delays (for example - what DRAM Strength means while OC'ing), which I missed while raising FSB speed.
Quote:
Originally Posted by Droviin View Post

Another trick would be to ensure that you have the most recent BIOS. The more recent versions generally have improved OC capability.
1102 is latest now.
Quote:
Originally Posted by Droviin View Post

Sometimes FSB just hits an upper wall for overclocking. When you max that out, you switch to multiplier OC and RAM timings. Individual motherboards have OC more or less. I've heard that the maximum for FSB increase isn't as high as one might think; but you're getting a 43% increase, which is fairly good.
biggrin.gif We always want greater perfomance...
Edited by Shtopor - 5/3/12 at 6:28am
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post #6 of 22
you need a bump to your CPU/NB voltage not to be confuseed with NB voltage the cpu/nb is on your cpu not part of the mobo its also linked with LMC of cpu when you rasie FBS you directly afect that area

I use a rule of thumb of a .5 lower then Vcore i.e cpu is 1.4 cpu/nb is 1.35 so on so forth
post #7 of 22
Thread Starter 
Quote:
Originally Posted by truckerguy View Post

you need a bump to your CPU/NB voltage not to be confuseed with NB voltage the cpu/nb is on your cpu not part of the mobo its also linked with LMC of cpu when you rasie FBS you directly afect that area
I use a rule of thumb of a .5 lower then Vcore i.e cpu is 1.4 cpu/nb is 1.35 so on so forth

Thanks for advice! But after setting CPU voltage 1.45V and NB to 1.4V - system boot failed.
I think Droviin is right - 43% OC is rather good, and I hope in future bioses this FSB wall will be fixed and I'll hit 287Mhz:)
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post #8 of 22
not you NB voltage your CPU/NB 2 diffrent things you pusyh NB past 1.25 and it will fail everytime
post #9 of 22
here is my 1090T at 290 and my CPU/NB was at 1.4 Vcore was at 1.45 NB was at 1.2

338
post #10 of 22
Interesting, 286 is my wall too tongue.gif

Though for me that's at 1.55v lol
 
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