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A couple pointers needed, unlocked 555 BE OC - Page 2

post #11 of 28
ok redwoodz. i just wanted to point out its possible. i do NOT anything for sure though lol.

my asus has no mosfet cooling but my case-side fans. im at 3.2 cpu and 2600 nb.
all stock volts and i havent flamed up. or smoked.
i did run 3.4 for a while before at 3.45v
as i said, i didnt smoke or flame. i just wanted to put out the info i read.
good luck with the oc.

i do want to say, im unlocked as a 130watt cpu. im on a 125 watt board. i cant wait to get my new board and ram.
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post #12 of 28
Thread Starter 
I'd still like to know whether it's a benefit to OC the FSB or not......
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post #13 of 28
A FSB overclock will bump everything up from RAM to northbridge and CPU. I use the multiplier to find out what the CPU will do at certain clocks and voltages. I get the best performance with a slight FSB OC (210) and a multiplier OC (19), that puts me @ 3990MHz. I get better benchmarks with that than with MY CPU @ 4.2GHZ.
Hope this helps.
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post #14 of 28
My personal opinion is that you just check your mosfets to see if they are getting really hot or not. I am not one of the alarmists that thinks that you should not OC on such boards. My belief is that you should just exercise greater caution and maybe not push so hard. Also getting some aftermarket mosfet coolers is not a bad idea. I actually have an old heatsink from a 486 that I was thinking about cutting up to use for mosfet cooling. But since I don't have any real issues with my mosfets I will probably not do that right now.

Just keep an eye on things, go slowly and pay attention to the mosfets. And of course watch how much voltage you are throwing into the CPU (because that will stress the VRMs). There have been a few threads on here about MSI boards catching on fire.
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post #15 of 28
Stop immediately.
125W processor overclocking (unlocked x2 + 125W) + 3+1 power phase = extremely dangerous. But if you thought 3+1 is enough, consider that you have an MSI board. MSI boards pretty much are the worst for VRMs and those are known to blow up very easily - even on heatsinked 4+1 sets - on OC'ed 125W processors! You must lock those two cores now before potentially facing serious consequences!
post #16 of 28
Quote:
Originally Posted by coonmanx View Post
I am almost certain that there will be a post on here shortly about why you should not OC that CPU on that board and that you are risking a fire. I don't know if that is true or not but it is an MSI board. Let's wait and see.
And there it is.
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post #17 of 28
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
Stop immediately.
125W processor overclocking (unlocked x2 + 125W) + 3+1 power phase = extremely dangerous. But if you thought 3+1 is enough, consider that you have an MSI board. MSI boards pretty much are the worst for VRMs and those are known to blow up very easily - even on heatsinked 4+1 sets - on OC'ed 125W processors! You must lock those two cores now before potentially facing serious consequences!
LOL! So; 555 BE: $87. MSI motherboard: $9 after rebate and discount. The value of being able to tell the story of your overclocked machine catching on fire: PRICELESS!!

Thanks ML241. I went to 3.9 stable at default VCore. 4.0 required a bump, so I'll stick with 3.9 or 3.8 'cause honestly in the end I want this machine to have speed-step enabled, and it won't be pushed very hard so there's no need for extremes. I'll work with CPU-NB next, and then bump FSB a little and compare benchies.

XD771: Don't worry brother! 4.0 was OK at +0.025 on VCore, but I'm sticking with default VCore and 3.8 or 3.9, and there will be a full-time fan on NB and mosfets that at least will blow the fire out when it goes up! If anything does go, I'll let you know and you can add me to the list...
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post #18 of 28
Only a small vCore increase? That's not so bad, but this is a 3+1 phase. This is also an MSI board. This is not even 4+1 phase, and definitely not of quality either. For the very least the mosfets have some heatsinks on them, but on MSI this tends to not even matter. VRMs can degrade over time as well as right away. I guess if you're happy with the risk, go ahead, though I know people who take it completely risk free and have even more extreme safety precautions and always put on mosfet heatsinks no matter what... not that I'm one of them, I've been a bit looser on 125W + 4+1 lately (i.e. NOT MSI, low RDS & no cheaping out, heatsinks and you're good), but I'm at least glad to know that you know the risk. Many people buy unknowingly.
post #19 of 28
Trust me 2thache...listen to xd 1771...i had my chip as a B55 quad core and the mosfet temps rocketed to 60c+ underload, now i don't know what the highest temps for mosfets are but that seems hot to me so i backed it down to a dual core..pretty much the specs i have in my sig rig.

But I can only give you both sides of the coin its up to you to decide if its dangerous...so the above was the bad side...here is the good:

If you want to stay as a B55 chip and make the chip hit 4ghz + you most certainly need 1.5v running to the cpu, as a difference, the chip as a dual core at 4ghz will most certainly run at stock volts 1.38v.

In terms of fine tuning i would say the biggest jump in performance came when i increased the cpu-nb to 2800mhz and to get the nb stable at that speed i need 1.4v

I dont really mess with ram timings cause i never seem to get them right, all i did was speed my ram to 1600mhz from 133mhz, and my system runs pretty good with no bottlenecks as far as i can tell.
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post #20 of 28
cpu-nb is a voltage. The nb runs at 2000mhz, so does htt. nb can get to 2.8 usually, but 2.4 and 2.6 suffice, except under high RAM OCs. Dont need more then 2400mhz NB at ddr3 1600. You want cpu-nb voltage to be less than or equal to your CPU voltage. Less the better.
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