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weird shut down, what you think the problem is?

post #1 of 9
Thread Starter 
Q6600 xfx 780i(evga)
it will automatically shut down after a few hours of gaming if under..
FSB 1600(1.4V) cpu at 3.6ghz (5Xc when shut down)
FSB 1600(1.4V) cou at 3.sghz (4x-5xc when shut down)


no shut down even after 8hrs of torture test and gaming IF
FSB 1400 (1.4V) cpu at 3.15ghz

do you think is the FSB gets too hot to shutdown?
it wasn't a lock or hang, just *puff* system off.
sometimes it won't even come back on after like 1-2mins cooldown.
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post #2 of 9
Download these programs, it is important you have the latest versions when stress testing on a quad. Run the blend test for 8-12hrs, while viewing temps with coretemp. If you have a B3 max temp should be about 65C, if you have a G0 max temp should be 72C.
http://www.overclock.net/downloads/1...core-temp.html
http://www.overclock.net/downloads/137251-prime95.html

1.4v on the FSB isnt that much, I've ran that on my 680i for a year with no issues. 1.5v is where you'd need to worry. Normally even if the FSB is the issue the stability testing will catch it.

You can also check your BIOS or download everest to see your NB/SB temps. The fact it won't turn on afterwards for a few minutes is also a good sign its the PSU.




P.S. Computer shutting down with no BSOD or errors is 99% of the time a PSU issue. Your PSU may be faulty.
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post #3 of 9
You didn't torture test it at 1600 fsb? Why not? Sounds to me like your overclock isn't stable.
    
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post #4 of 9
Your overclock isn't stable. When you overclock your computer and the speed of your computer isn't stable, it basically crashes. I recommend lowering the fsb and monitor the speeds with a program called pc wizard 2008. This is the program that i use and it is fantastic. It monitors more than the temps of the your cpu as well as other parts in your computer.

PC WIZARD DOWNLOAD
    
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post #5 of 9
Thread Starter 
Yeah I have been running it for 2 days now at 1400FSB and 3.15ghz and is rock solid.
no shutdown, no bsod.

what I don't understand is why it will shutdown at 1600FSB and 3.6.
Temp were low on cpu only 5xc .

Also after shut down it will still spin up just it will shut down right the way is not like the psu is dead. That's why I think was the FSB got too hot.....
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post #6 of 9
Thread Starter 
Do I need to raise any other voltage?
I only changed vcore, fsb, memory, the rest are on auto (SPP MCS etc)
will increasing SPP voltage have better fsb cooling?
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post #7 of 9
I have to agree that PSU is a major suspect. You may have a short somewhere in your case; as the heat builds, something might dip and contact the case, causing a short. Or, the short is in your PSU. Not saying it's not your OC, but usually there's a BSOD, or a lock, or something. Immediate power loss is a diff. kind of thing IMO
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Optimus Prime 95
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post #8 of 9
Thread Starter 
yeah no lock no bsod....will increase SPP helps if this is because of FSB too hot?

I kinda lean on the FSB too hot because I have 2 system, almost identical just except another one
is running 4GB and windows ultimate and 850W psu with different version of 8800GT X2.

same problem when running 1600FSB 3.6ghz system will shut down under extreme test....
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post #9 of 9
I see you have 4 gb of RAM. Raising your SPP (Northbridge) voltage may help, particularly if you're using all four RAM slots (this puts extra stress on the SPP). However, if you do raise that voltage, you'll have to deal with increased heat on an already very hot component. If it's on Auto, it's probably been going up anyway - I have the same board, and I think it took me up to 1.4v SPP (from 1.25) when I got my q6600 up to 3.2 ghz.

I'm sort of dealing with the same issue - I seemed to have greater stability when I raised my SPP, but the damn thing got so hot. I was afraid it was shortening the SPP chip's lifespan. My solution was to get a 2x2gb RAM kit, so I only use 2 RAM slots. I was able to lower my SPP volts - 1.4v right now - without losing too much stability (it's still an issue). I must say, the advent of warmer weather (and poor air conditioning) has made the heat issue more prominent in my considerations. Can't tell from your sig how you do your 4 gb - 2 sticks or 4 - but if it's 4, you may wanna go to 2.
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