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FSB instablility

post #1 of 24
Thread Starter 
when i get my FSB higher than ~250 my system becomes unstable, i tried to keep all other settings as close to stock as possible to make sure its nothing else.
i notice that while testing the ram for stability and as long as the FSB is low i dont get any errors with MemTest (in windows) but when i increase the FSB it errors pretty fast.

so as far as i read increasing the NB voltage should increase the stability with higher FSB but it seems that it doesnt help at all, i tried up to 1.4v on the NB and it seems it becomes even more unstable...

so what am i doing wrong here?
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post #2 of 24
Quote:
Originally Posted by kromar View Post
when i get my FSB higher than ~250 my system becomes unstable, i tried to keep all other settings as close to stock as possible to make sure its nothing else.
i notice that while testing the ram for stability and as long as the FSB is low i dont get any errors with MemTest (in windows) but when i increase the FSB it errors pretty fast.

so as far as i read increasing the NB voltage should increase the stability with higher FSB but it seems that it doesnt help at all, i tried up to 1.4v on the NB and it seems it becomes even more unstable...

so what am i doing wrong here?
Is your ram runnin close to stock timings and speed?
post #3 of 24
Thread Starter 
Quote:
Originally Posted by konspiracy View Post
Is your ram runnin close to stock timings and speed?
yes as close as possible.
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post #4 of 24
Thread Starter 
anyone? could it be that my board just cant handle more than 250? seems a bit low for a 790 chipset...
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post #5 of 24
When you say increase NB, are you talking about the NB voltage or the CPU/NB voltage. CPU/NB voltage is what you should be adjusting as it controls the IMC in the CPU. The NB voltage is for the chipset and should be fine on auto.
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post #6 of 24
Thread Starter 
Quote:
Originally Posted by The Sandman View Post
When you say increase NB, are you talking about the NB voltage or the CPU/NB voltage. CPU/NB voltage is what you should be adjusting as it controls the IMC in the CPU. The NB voltage is for the chipset and should be fine on auto.
im talking about the NB voltage not CPU/NB.

isnt the CPU-NB voltage for the NB speed and the NB voltage for the FSB?
also there is no auto on this board, there is just a "normal" which is just a fixed value.
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post #7 of 24
Yes but usually isn't necessary till closer to 300 ref clock.
In the OP you said
"i notice that while testing the ram for stability and as long as the FSB is low i dont get any errors with MemTest (in windows) but when i increase the FSB it errors pretty fast."
My thought was maybe an increase in the CPU/NB voltage may help as it controls the IMC which is how the CPU communicates with the ram.
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post #8 of 24
Thread Starter 
Quote:
Originally Posted by The Sandman View Post
Yes but usually isn't necessary till closer to 300 ref clock.
In the OP you said
"i notice that while testing the ram for stability and as long as the FSB is low i dont get any errors with MemTest (in windows) but when i increase the FSB it errors pretty fast."
My thought was maybe an increase in the CPU/NB voltage may help as it controls the IMC which is how the CPU communicates with the ram.
well i will give this an other try but i think i already tried with a 1.4v CPU-NB voltage...
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post #9 of 24
Thread Starter 
so i set the FSB to 286 since thats definitely in the critical range and increased the CPU-NB voltage to 1.45v (just to see if it really can get stable) and so far the memtests are running without errors. i will let this run over night and see if it stays that way.
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post #10 of 24
Thread Starter 
so after all the bsod nightmare i set up 2 win7 partitions, one for overclocking only and the other one for all the other stuff. i have created a system image and if this goes bad i can just recover to the clean installation

so far im only on the OC partition and didnt had a single bsod since. ive got a stable 3.5ghz oc again.

so far i only need 1.225v on the CPU-NB for the 2500mhz NB which quite a bit lower than it used to be

im testing now again if i can get any FSB above 250 stable, but it looks pretty good so far. at least no nasty bsods from the bad OS are messing things up
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