X79 VRM/MOSFET temperature

Yaayuh! · 14 May 2012 at 13:40

Hi all.
I know MOSFETs can take a beating in terms of heat, they're designed to. Also on modern motherboards (unless disabled) the power will throttle when they're too hot before any major damage is done (well.... apart from maybe that Gigabyte instance a little while ago

).
That said, i know they will differ, but what's the general maximum temperature for MOSFETs/VRM on motherboards powering the CPU? or the temperature i should stay under? Specifically the X79 platform.

Yaayuh! · 15 May 2012 at 11:27

Bump

Also, (will probably email them separately) why do Overclocker not sell tiny individual small component heat sinks? For vram for example. I was looking to get a few of these and apply to the back of the MOSFET heatsink and maybe on the heatpipe there is space too.

andybird123 · 15 May 2012 at 11:47

120C seems to be widely regarded as the maximum operating temperature for the type of mosfets used on motherboards, but you can check if you can read off the part number you should be able to find the manufacturers spec

"people on forums" tend to say that they like to keep their VRM's under 70C... though quite why other than personal preference no one seems to be able to say, because as mentioned manf's specs tend to say something along the line of 120C

Yaayuh! · 15 May 2012 at 11:51

Thanks Andy, this is as i thought. Though ASUS AI Suite II on the Sabertooth flashes up with VCORE (MOSFET) warning at 80c+ which i will get to with a moderate overclock with a fan pointing at the heatsink...
I'll see if i can find out the part number from the internet because i don't want to rip off the heatsink to find out myself.

Cheers

EDIT
Looks like they're the same "TUF Low RDS_On" MOSFETs as X58 and:

TUF MOSFET: Industry top graded low RDS(On) MOSFET approved by ISO and IEC/IECQ certified independent laboratory to meet military standard. These MOSFETs deliver robust efficiency while also sustain the ultra critical thermal shock of between - 65~150 ° C. The power solution is formed by four of this type of MOSFETs, delivering unbeatable performance as well as durability.

andybird123 · 15 May 2012 at 12:05

that warning will have been set based on stock clocks, you can raise the warning limit manually when overclocking

Yaayuh! · 15 May 2012 at 12:06

andybird123 said:
that warning will have been set based on stock clocks, you can raise the warning limit manually when overclocking

I'm not sure where/how there doesn't seem to be anything in the BIOS or AI Suite that i can see.