IC7 Mosfet temps !!

[FragMagnet]

I was using a calibrated thermister on a Multimeter to check out my mosfet temps. Most were in the 130F range, but the one next to the 12v connector was 155 F :eek: while running Prime @ 3.6 1.7v. When it's under load like this the sensor drops from 11.96v to 11.88v, but after awhile it will drop to 11.61v and Prime will error. Since I noticed Abit with the IC7-G Max3 was actively cooling these things, i thought I'd investigate. I tried doing a google search and came up empty.

What I'm looking for is the Data Sheet for the mosfets, I don't see any brand stamping on them but they are marked:

PHB108
NQ03LT
PHm 0240 C6
9600

Now I'm not sure on the conversion, but I do know that switching from C to F in MBM5, a 57c temp on the cpu = 137F, so I'm assuming 155 F is friggin HOT !

Any info or links are appreciated.

[eva2000]

130F = 54C
155F = 68C

i've got 2 fans blowing on the mosfet on my IC7 now, 80mm TT smartfan II and 92mm sunon fan

[Jupiler]

Mine look newer than yours.
Here's what's marked on them :

PHB108
NQ03LT
PHm 0310 A2
6991

Board is IC7-G

[FragMagnet]

Thanks, I remember seeing the data sheet for RDram clock generators on my TH7-II and max temp for those was 60-70c so I'm suspecting this is the limit for ic's.

I'm looking to add HS to the mosfets and a fan over them as well. This 520 watt PSU never dipped below 12v on the TH7-II and it has always had these readings since the IC-7.

[FragMagnet]

Originally posted by Jupiler
Mine look newer than yours.
Here's what's marked on them :

PHB108
NQ03LT
PHm 0310 A2
6991

Board is IC7-G

I wonder if that was the revision difference in the newer boards ?

[FragMagnet]

Originally posted by eva2000
130F = 54C
155F = 68C

i've got 2 fans blowing on the mosfet on my IC7 now, 80mm TT smartfan II and 92mm sunon fan

I'd focus on the ones near the 12v connector, as they seem to run 20c warmer than the others.

Which ram do you run with the IC7 ? How did the Xtreme DDR work for you ?

[Jupiler]

I'll try to find a thermister and read the temps from the 2 next to the 12v connector. But that will be for monday.

[eva2000]

Originally posted by FragMagnet
I'd focus on the ones near the 12v connector, as they seem to run 20c warmer than the others.

Which ram do you run with the IC7 ? How did the Xtreme DDR work for you ? right now running ocz pc3700 gold http://www.xtremesystems.org/forums/showthread.php?s=&threadid=15937 :)

xtremeddr sticks have been delayed until Monday/Tuesday to get to me (was meant to be here on Friday but distributor had some conferences/meetings which ran late heh)

[FragMagnet]

Originally posted by eva2000
right now running ocz pc3700 gold http://www.xtremesystems.org/forums/showthread.php?s=&threadid=15937 :)

xtremeddr sticks have been delayed until Monday/Tuesday to get to me (was meant to be here on Friday but distributor had some conferences/meetings which ran late heh)

I've had these up to 247 1:1 @ 2.8v in the bios, so I hope they work for you :D

[CCW]

A few people here reported MOSFET damage from heat which resulted in the loss of their board here:

http://www.xtremesystems.org/forums/showthread.php?s=&threadid=14804

This seems to be the reason why the Max 3 has active MOSFET and capacitator cooling. Might be an idea to cut up some heatsinks for you FETs and get some air blowing over them too.

Craig

[Hydra]

I almost lost my Asus A7V133-C in the past, MOSFETs heated enough that one melted itself off from it's soldering iron.

http://koti.mbnet.fi/hydra/temp/1_viisto.jpg

But after soldering a new MOSFET there it worked again, might have worked even with the same MOSFET but never tried.

Anyway 68C is nowhere hot for a MOSFET ;)

[Learn]

hi,

that will be able help someone

PHB108NQ03LT datasheet :

http://www.semiconductors.philips.com/acrobat/datasheets/PHP_PHB_PHD108NQ03LT-02.pdf

[FragMagnet]

Thanks Learn