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Phenom II x4 965 Cant reset FSB from 240 back to Default 200 in BIOS

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May 12, 2011 5:53:38 AM

Hi, hoping somebody can help. I Don't seem to post much, only when I get my self into trouble but it's worked out so far. Heres my problem. I am running an
Athlon II x4 Black Edition 965 cpu with a MSI NF750-G55 AM3 NVIDIA nForce 750a SLI motherboard. There is an overclock switch on the motherboard that has been disabled or turned to off.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Here is my problem. I cannot set the stock bus speed in the BIOS back to 200MHz. The lowest it goes is 240. Even at fail safe. I have tried everything disabling cool and quiet and core calibration. This is making the 4th core unstable and giving me blue screens I believe. I have run it as low as 2.4GHz with the bus at 240 and multiplier at around 10 and still blue screens. Usually happens when running multi-threaded applications like extracting files. A Prime 95 test shows an unstable 4th core within seconds. I believe not being able to set the cpu bus speed in BIOS in the culprit. Thanks in advance for any help.



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a b K Overclocking
May 12, 2011 4:28:44 PM

You tried pulling the cmos battery for 5 minutes?
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May 12, 2011 6:39:23 PM

Why is your multiplier at 10? You trying to underclock the CPU? The default/stock multi is 17, with the default FSB of 200. The instability could be becuse your CPU voltage. Try raising that bad boy to 1.4 - 1.5, or so.
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May 12, 2011 8:30:52 PM

His multiplier is 10 probably because it's cool n quiet. It under-clocks the cpu on it's own.

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May 13, 2011 2:25:05 AM

T_T said:
Why is your multiplier at 10? You trying to underclock the CPU? The default/stock multi is 17, with the default FSB of 200. The instability could be becuse your CPU voltage. Try raising that bad boy to 1.4 - 1.5, or so.



Yes but it still doesnt let me set my bus speed to 200 in the bios. The lowest it will go is 240. Makes no sense to me. I have cool and quiet disabled. There should be no reason I cannot set this cpu back to stock settings with bus at 200 and multi at around 17. This seems like a motherboard problem. Maybe the default fsb is set to 240 and it can go no lower? I'm running out of ideas and I really don't want ot have to buy another mb over this.
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May 13, 2011 3:07:14 AM

geekapproved stated this already but....reset the BIOS...pull the CMOS battery for 5 minutes...That should set it all back to defaults...no default is 200 MHz
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a c 139 à CPUs
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May 13, 2011 3:40:09 AM

find Easy OC switch on the motherboard. maybe locked.
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May 13, 2011 3:41:47 AM

Ah...+1^ henydiah.....didn't think of that
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May 13, 2011 5:54:09 PM

henydiah said:
find Easy OC switch on the motherboard. maybe locked.

No the easy oc switch of set to off. Im clueless. Ive tried everything. There sould be no reason i cant set i back down to 200 from 240. Bsod is kickin my ass

Also everytime I set the bios back to defualt it puts everything on auto and kicks my cpu freq up to 4GHz!!! The easy overclock switch is off and everytime I change mb back to default bsod before I get into windows. THis has to do with the cpu bus being set to 240 everytime. ARRRRRRRRRRRRRRRRRRRRRRRRRRR
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May 13, 2011 6:56:46 PM

Aside from yanking out the battery, you can also use the JBAT1 jumper to clear the CMOS. With the system's power off (unplug the P1 and P4 connectors, too), move the jumper so that it covers pins 2-3. Wait for a minute or so, then place the jumper back to it's original position, covering pins 1-2.

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May 13, 2011 7:01:25 PM

T_T said:
Aside from yanking out the battery, you can also use the JBAT1 jumper to clear the CMOS. With the system's power off (unplug the P1 and P4 connectors, too), move the jumper so that it covers pins 2-3. Wait for a minute or so, then place the jumper back to it's original position, covering pins 1-2.



Yeah Ive done that too. Many many times. Im starting to think this board is fked.
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May 13, 2011 10:11:15 PM

Sounds like the easy OC switch itself is broke ...as in, the switch physically moves yet is stuck in the on position...try messing with the easy OC button..like slide to the ON position then slide it to OFF....maybe something is just stuck inside of it that can be jiggled free
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May 14, 2011 11:58:40 AM

Did you overclock using a windows program?.
AMD overdrive has an option to apply overclocking at windows start up, many other programs do also.
If your bios is showing 200fsb and it increases in windows this may be your problem.
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May 21, 2011 3:09:54 AM

I can get it to run at stock settings by unplugging everything and reseting it but in bios I cannot get the fsb down to 200. It will go no lower than 240. So if I save in the bios im screwed.

I dont have any overclocking utilities that run from windows.

When I turn on the pc it tells me the cmos checksum is bad press f1 to enter setup. Then from there I have to hit ESC to boot into windows. If I save any options in the bios it bumps the fsb back up to 240. So I'm stable now but I cannot change a thing in the bios at all.
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May 21, 2011 5:16:20 AM

RMA is good idea...
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May 21, 2011 5:23:49 AM

Too late for that..................
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May 21, 2011 7:26:59 AM

lowjack989 said:
Sounds like the easy OC switch itself is broke ...as in, the switch physically moves yet is stuck in the on position...try messing with the easy OC button..like slide to the ON position then slide it to OFF....maybe something is just stuck inside of it that can be jiggled free



Have not had a chance to read your post until now. Going to try this in the morning. Thx.
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January 27, 2012 4:50:29 AM

bigbadosker said:
No the easy oc switch of set to off. Im clueless. Ive tried everything. There sould be no reason i cant set i back down to 200 from 240. Bsod is kickin my ass

My MSI MB has the same OC switch and I had same problem - drove me insane for months
I come to find out that the 'default' position (read MB manual on MSI website) for the switch is for both to be set towards where it says ON (a$$ backwards MSI) I had them set to the side with the numbers thinking that was off (because the other side says ON) but its not.
I almost threw the comp off the roof over this one. Now shes my bestest friend again :0)
Hope this helps

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