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500*8 100% stable, but 450*8 = crash???

post #1 of 7
Thread Starter 
I just got an A1 680i back from a RMA on a tr I had. All of a sudden I start to realize that I am crashing constantly. With any 8 multiplier and fsb it will crash the system. I was half way stable at 400 * 8, but thats about it, and that also needed extremely high motherboard voltages. I am getting frustrated at this point so I decide to test 7 multi's, all of a sudden I am stable at 2000 fsb with 1.3vfsb and 1.35spp. This makes no sense to me I can go into bios and all I change is multi/fsb and its extremely unstable, but 500 * 7 has been perfect since I have started running it.
    
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post #2 of 7
thats because a new strap starts at 401MHz. by going to 500 you triggered the mobo to change the strap (latency timings for NB)

not sure if this is true with 680i, but in any case, congratz with a stable OC.
post #3 of 7
update bios, compensate for NB strap

or enjoy 3.5GHz
    
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post #4 of 7
Chiel is correct, there are certain spots some motherboards just don't like period. I bet if you drop your multi all the way down 450 still wouldn't work. It's just the way the straps, or timings of the board, are setup, just run it at 500mhz 7x and if you feel you need more speed just bump it up to 8x. Nothings wrong, just the way some boards are made.
post #5 of 7
Quote:
Originally Posted by Xecuter2 View Post
I just got an A1 680i back from a RMA on a tr I had. All of a sudden I start to realize that I am crashing constantly. With any 8 multiplier and fsb it will crash the system. I was half way stable at 400 * 8, but thats about it, and that also needed extremely high motherboard voltages. I am getting frustrated at this point so I decide to test 7 multi's, all of a sudden I am stable at 2000 fsb with 1.3vfsb and 1.35spp. This makes no sense to me I can go into bios and all I change is multi/fsb and its extremely unstable, but 500 * 7 has been perfect since I have started running it.
The above posts are right. You are hitting an area of unstable performance around 450Mhz. By 500Mhz you have jumped strap and are now in a more stable (but slower) strap.
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post #6 of 7
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post #7 of 7
Thread Starter 
Thanks a lot, I figured that but I also took into consideration that my old TR board can do 8x fine but is not stable at 2000 fsb (with a 7 multi). I have the latest bios flashed (p29) So the question here is, when I get a G0 stepping, should I keep this board and see how it goes, or get a ds3r?
    
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