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Is overclocking on my mobo advisable?

post #1 of 37
Thread Starter 
If my cpu has a tdp of 120w, and my motherboard has a rated tdp of 140w, am I playing with fire? This system will be liquid cooled.
Should I put heat sinks on the vrm?


Mobo-Asus M5A97 LE R2.0

CPU-Phenom II 965 be

Thanks
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post #2 of 37
the VRM section is naked : I would not
plus with liquid cooling there wold be even less airflow in that section
bringing to a possibly early system failure

if you manage to attach some heatsink (beware of shortcircuiting in the attempt) on VRM
it will be safer and you can OC (not heavly)
post #3 of 37
Thread Starter 
I was also thinking, I could rig up a fan to blow on the vrm. I already have a few fans, and all the add on copper vrm heat sinks I need.

These are the vrm, right?

08130219b2a785_Copy.jpgimage hosting over 10mb




Do I need to heat sink these also?

copy2.jpgimage hosting services
Edited by Timbo-42 - 1/11/17 at 7:14am
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post #4 of 37
I don't know the specific function of those chips (some are for power other only for control)
better dissipate both highlighted sections wink.gif

p.s. you can search and read the datasheet to know the exact chip's function
post #5 of 37
Hi!

I believe the first pic is the VRMs. Dunno what the 2nd row is. Cooling is everything. You will get a small overclock but not high clocks as the overheating VRMs will limit it.
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post #6 of 37
They are all mosfets. ASUS simply used different categories for the high and low side mosfets. It used a blend of older D-Paks and newer lowRDS(on), instead of using all the same. If you can, heatsink them all.
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post #7 of 37
I've built machines with that exact board using Phenoms and FX 4xxx and 6xxx CPUs, it can supposedly run an 8 core at stock but I wouldn't bother. Those mosfets get quite hot under heavy load (not just synthetic but video game or rendering load) stock on a 125w TDP chip. If you really want to push it to it's limit, get matching (or close) sized heat sinks and maybe a pair of 40mm fans (if you don't mind the buzzing, they aren't so bad if you run them to a controller and dial them down a peg).

If you're in the US, check out the memory and chipset cooling section on Newegg or other similar retailers, you'll find something cheap.

That all said, don't expect a huge overclock as it is. c3 phenoms like >1.5V to get 4ghz, even if you cool that VRM it's just not going to handle it, it's way too much power. IIRC that CPU has a stock vcore of 1.425.

See how far you can push the chip on stock voltage and shoot for a modest overclock, 3.6 or 3.7ghz may be possible around 1.45v.

Last bit of advice, stress test the machine by running games and other software you intend to run with it. Don't put it through prime95 or any torture tests, not worth the risk.
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post #8 of 37
Thread Starter 
Quote:
Originally Posted by Undervolter View Post

They are all mosfets. ASUS simply used different categories for the high and low side mosfets. It used a blend of older D-Paks and newer lowRDS(on), instead of using all the same. If you can, heatsink them all.

I have 8 copper 1/2''x 1/2'' square heat sinks, and 6 anodized aluminum heat sinks the same size. I have already test fit the copper ones on the vrm, and it looks like one heat sink covers two vrm perfectly. The aluminum ones work fine on the other mosfets. I had to order arctic alumina online, because no place in the area carries it....not even RadioShack, in fact RadioShack don't even carry thermal tape anymore.mad.gif
Edited by Timbo-42 - 1/11/17 at 10:42pm
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post #9 of 37
Thread Starter 
Quote:
Originally Posted by Serious_Don View Post

I've built machines with that exact board using Phenoms and FX 4xxx and 6xxx CPUs, it can supposedly run an 8 core at stock but I wouldn't bother. Those mosfets get quite hot under heavy load (not just synthetic but video game or rendering load) stock on a 125w TDP chip. If you really want to push it to it's limit, get matching (or close) sized heat sinks and maybe a pair of 40mm fans (if you don't mind the buzzing, they aren't so bad if you run them to a controller and dial them down a peg).

If you're in the US, check out the memory and chipset cooling section on Newegg or other similar retailers, you'll find something cheap.

That all said, don't expect a huge overclock as it is. c3 phenoms like >1.5V to get 4ghz, even if you cool that VRM it's just not going to handle it, it's way too much power. IIRC that CPU has a stock vcore of 1.425.

See how far you can push the chip on stock voltage and shoot for a modest overclock, 3.6 or 3.7ghz may be possible around 1.45v.

Last bit of advice, stress test the machine by running games and other software you intend to run with it. Don't put it through prime95 or any torture tests, not worth the risk.


I am not planning to keep this board to long, It actually has a problem with the main pci express slot, where If I run either of my video cards in that slot, my system becomes unstable (either lose signal to the monitor, or reboots the system constantly). If I run the 7850 in the lower pci e slot, everything runs fine ( the 7950 doesn't have clearance to fit in the lower slot)

I don't really have the money to spend right at the moment, But when I do I was thinking of buying either a Asus Sabretooth, or Gigabyte GA-990FXA-UD3. I don't know which one I will end up with, but i'm sure it will be better then what I have.
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post #10 of 37
Thread Starter 
Thanks for the help everyone......+reps for all.thumb.gif
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