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CPU and NB not playing well together.

post #1 of 12
Thread Starter 
hey all, having an OC problem. i'm using my sig rig. i can oc the processor to 4.275 fairly easily and test it w/ prime and it's stable, and i can oc the NB to 2.75 and test it stable as well.

the issue comes in when i try to test both together. initially i would get a bsod or the screen would go out and it would reset. i dropped it down to 4.2 and 2650 and it fails prime but doesn't bsod or reset. any ideas?

cpu 4.2 @ 1.45v
np 2.65 @ 1.3v
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post #2 of 12
try backing off the overclock on both together just a bit. go for like 4ghz and 2.6ghz.
post #3 of 12
Yeah, I agree, go for a lower CPU overclock and you should be able to raise your NB freq. I have 4ghz @ 1.44v and NB @ 2800mhz 1.3v. It's possible that your L3 cache is slightly faulty with 4 cores instead of the normal 2, though that's more a thought than anything.
    
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post #4 of 12
P95-blend test uses much more memory than small/large tests. Thats why your blend test fails.
If your temps are OK, raise your CPU/NB and/or RAM volt.
Edited by IOSEFINI - 2/3/11 at 12:18pm
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post #5 of 12
Thread Starter 
Quote:
Originally Posted by Kokin View Post
Yeah, I agree, go for a lower CPU overclock and you should be able to raise your NB freq. I have 4ghz @ 1.44v and NB @ 2800mhz 1.3v. It's possible that your L3 cache is slightly faulty with 4 cores instead of the normal 2, though that's more a thought than anything.
i've been running @ 4.03 stable for the past month with a NB @ 2.55, but i wanted to try to get a little more out of it.

the NB ceiling by itself on this board seems kind of low, wasn't able to get more than 2800 @ 1.3 stable. also i'm fairly certain my 3rd core is the weaker of the 4 because it's always the first to fail whenever i test it.

would it be worth it to run @ 4.0 and bump my NB up to 26/2700 or should i keep my nb at 2.55 and bump my cpu back up to 4.3?
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post #6 of 12
Oh, also try testing 20 runs with IntelBurnTest with Max memory, I found IBT to find instability quicker than Prime95 would.
    
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post #7 of 12
Thread Starter 
Quote:
Originally Posted by IOSEFINI View Post
P95-blend test uses much more memory than small/high tests. Thats why your blend test fails.
If your temps are OK, raise your CPU/NB and/or RAM volt.
my ram is underclocked signifigantly while trying to get a stable NB/CPU combination. also, idk how i feel about running higher voltages than i'm currently at. my temps don't go above 55c, but pushing more than 1.5v through my chip scares me.
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post #8 of 12
Quote:
Originally Posted by steamboat View Post
i've been running @ 4.03 stable for the past month with a NB @ 2.55, but i wanted to try to get a little more out of it.

the NB ceiling by itself on this board seems kind of low, wasn't able to get more than 2800 @ 1.3 stable. also i'm fairly certain my 3rd core is the weaker of the 4 because it's always the first to fail whenever i test it.

would it be worth it to run @ 4.0 and bump my NB up to 26/2700 or should i keep my nb at 2.55 and bump my cpu back up to 4.3?
Did you try a small RAM voltage bump? Usually helps when 1 or more cores fail.
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post #9 of 12
Quote:
Originally Posted by steamboat View Post
i've been running @ 4.03 stable for the past month with a NB @ 2.55, but i wanted to try to get a little more out of it.

the NB ceiling by itself on this board seems kind of low, wasn't able to get more than 2800 @ 1.3 stable. also i'm fairly certain my 3rd core is the weaker of the 4 because it's always the first to fail whenever i test it.

would it be worth it to run @ 4.0 and bump my NB up to 26/2700 or should i keep my nb at 2.55 and bump my cpu back up to 4.3?
Try disabling the 3rd core and see how far you go, it should let you know if that core can't handle those speeds. If it's the same case, then try raising NB voltage to 1.25v-1.3v and raise your RAM voltage as IOSEFINI suggested. Since the NB-CPU affects RAM, that might be what is causing it to fail.

Edit: Try not to go past 1.5v for your CPU voltage, since our MSI boards only have 4+1 phase VRMs they are most likely to get stressed past 1.475-1.5v. I was able to use 1.55v-1.6v before, but that degraded my board until the VRMs finally gave up and I had to RMA it.
Edited by Kokin - 2/3/11 at 12:31pm
    
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post #10 of 12
Thread Starter 
i feel silly. bumping the ram from 1.66 to 1.7 just stabilized everything, and it looks like the ceiling just got raised.

thank-you very much guys, i'm gonna go see what this thing can do
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