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Do i even need MOSFET cooling? - Page 3

post #21 of 50
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Quote:
Originally Posted by iinversion View Post

Do you really need that much voltage for it to be unlocked and OC'd to 3GHz? That seems like a bit much..

actually no i dropped it to 1.35V and its perfectly stable but it does spike to 1.396V for a brief second or 2 during intensive games like BC2. but i no longer have a CPU bottleneck in any game i play not even crysis warhead.
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post #22 of 50
Quote:
Originally Posted by philhalo66 View Post

actually no i dropped it to 1.35V and its perfectly stable but it does spike to 1.396V for a brief second or 2 during intensive games like BC2. but i no longer have a CPU bottleneck in any game i play not even crysis warhead.


1.396v is the voltage under load then, which is the voltage that matters. Seems like if you want 1.35v you'll need to drop to 1.3v in the bios.
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post #23 of 50
Quote:
Originally Posted by Alex132 View Post

You have an overclocked, overvolted Phenom II with NO mosfet cooling on a 4+1 board? Are you sure he doesnt need it?

This. First it's a 4+1 board and no heatsink. With overclocking, I would get a heatsink. If it is cool to touch, (under load) then you are fine at your current specs. Load is what gets the power system hot.
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post #24 of 50
Thread Starter 
Quote:
Originally Posted by iinversion View Post

1.396v is the voltage under load then, which is the voltage that matters. Seems like if you want 1.35v you'll need to drop to 1.3v in the bios.

hmm okay i dropped to 3.32V and max is 1.350V.

Quote:
Originally Posted by AMC View Post

This. First it's a 4+1 board and no heatsink. With overclocking, I would get a heatsink. If it is cool to touch, (under load) then you are fine at your current specs. Load is what gets the power system hot.

well they are not cool but my video card is at least 3 times as hot (69-72C)
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post #25 of 50
Quote:
Originally Posted by philhalo66 View Post

hmm okay i dropped to 3.32V and max is 1.350V.
well they are not cool but my video card is at least 3 times as hot (69-72C)

Cool, I would lower it as low as possible to maintain a stable slight OC.

You are touching the VRM's right? The little tiny chips to the left of the square blocks? If you are looking at it with the I/O shield being the left side.
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post #26 of 50
I've got a similar board. No MOSFET cooling. I've been running only like 1.32-1.35v. My MOSFET's got pretty hot under Prime95 testing but no so hot any other way. I kinda did some ghetto cooling on the MOSFETS, used leftover VRM coolers from the Arctic cooling kit I had. Seem to work great! Not concerned about heat anymore. I've got just a little bit of air over them too.
post #27 of 50

You already have "MOSFET cooling".

End the discussion guys tongue.gif it seems every one of you forgot to even consider what is the CPU cooler he is running.

 

Your downward blowing (i.e. towards motherboard) Rocketfish Universal Cooler provides airflow to the VRMs keeping them cool and stable.  No further action is necessary. thumb.gif

 

Don't be fooled by the others though, it is NOT fine to leave a 125W Phenom II x4 processor without ANYVRM cooling (neither airflow no heat) on 4+1 phase setups because in such a case heat can certainly easily and quickly pile up; as a result of that you may run into some efficiency and operational issues including ability of VRMs to keep up that may trigger protective measures and thus cause you to lose performance or saved data.  However, again as in this case there IS MOSFET cooling, no further action is necessary.


Edited by xd_1771 - 2/18/12 at 8:51pm
post #28 of 50
Thread Starter 
Quote:
Originally Posted by iinversion View Post

Cool, I would lower it as low as possible to maintain a stable slight OC.
You are touching the VRM's right? The little tiny chips to the left of the square blocks? If you are looking at it with the I/O shield being the left side.

yup those little black squares theres 25 of them they arent really hot plus i am running stock accept my CPU is unlocked but at stock voltage and clocks.
Quote:
Originally Posted by Cakewalk_S View Post

I've got a similar board. No MOSFET cooling. I've been running only like 1.32-1.35v. My MOSFET's got pretty hot under Prime95 testing but no so hot any other way. I kinda did some ghetto cooling on the MOSFETS, used leftover VRM coolers from the Arctic cooling kit I had. Seem to work great! Not concerned about heat anymore. I've got just a little bit of air over them too.

i do have $35.38 to throw around for proper VRM cooling those enzotech tiny things look interesting.
Quote:
Originally Posted by xd_1771 View Post

You already have "MOSFET cooling".


End the discussion guys tongue.gif it seems every one of you forgot to even consider what is the CPU cooler he is running.

Your downward blowing (i.e. towards motherboard) Rocketfish Universal Cooler provides airflow to the VRMs keeping them cool and stable.  No further action is necessary. thumb.gif

Don't be fooled by the others though, it is NOT fine to leave a 125W Phenom II x4 processor without ANYVRM cooling (neither airflow no heat) on 4+1 phase setups because in such a case heat can certainly easily and quickly pile up; as a result of that you may run into some efficiency and operational issues including ability of VRMs to keep up that may trigger protective measures and thus cause you to lose performance or saved data.  However, again as in this case there IS MOSFET cooling, no further action is necessary.

you are refering to this cpu cooler right?
260

and my case has good airflow it beats my friend CM storm scout when it comes to idle and load temps but it probably helps that i got high efficiency fans not the stock crap ones.
Edited by philhalo66 - 2/18/12 at 9:03pm
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post #29 of 50

You don't have the downward-blowing version?  If you don't have the downward-blowing version you really should ensure that SOME cooling gets to the VRMs.  Touching them after a system shut down doesn't help you make the measurement as the VRMs easily cool down between the time you stop the stress test and the time the system is fully off; for all you know they could be burning at full load.  Ensuring the cooling and being sure is the safest way out.  Otherwise I recommend you don't unlock - or OC.

 

Any VRM system that is left without cooling and required to take on a fairly power-hungry processor is dangerous.  Case airflow doesn't necessarily mean anything because other fans including the CPU fan and objects on the motherboard such as the CPU connector may easily deflect and block airflow from low-lying areas such as the fragile MOSFETs.  If you want to remove heat from the VRMs the air has to actually get there and hit the chips - if it's in any way missing the chips, it's also not receiving the heat because without cooling the heat has no way to radiate.  Heatsinks can extend surface area to reach ambient airflow, but a direct fan is best and very effective.  Mount a small one?


Edited by xd_1771 - 2/18/12 at 9:06pm
post #30 of 50
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post

You don't have the downward-blowing version?  If you don't have the downward-blowing version you really should ensure that SOME cooling gets to the VRMs.  Touching them after a system shut down doesn't help you make the measurement as the VRMs easily cool down between the time you stop the stress test and the time the system is fully off; for all you know they could be burning at full load.  Ensuring the cooling and being sure is the safest way out.  Otherwise I recommend you don't unlock - or OC.  Any VRM system that is left without cooling and required to take on a fairly power-hungry processor is dangerous.

i didn't even know they made a downward blowing one lol, i touched the VRM's when i was playing BC2 maxed and they weren't even half the temp my 4870 was and my 4870 was 70C. but since you are who you are thumb.gif I'll take your word for it. what do you recommend for coolers?
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