MSI PM8M3-V rev. 1 - unstable gaming only
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November 9, 2013, 03:18 AM
Join Date: Feb 2008
Location: Czech republic
My System Specs
Oh, man, that one suxx bad:
, 15A, rise time
, shutoff time 18nS
gate charge 14.4nC, gate treshold
60V is too high (unnecessary, source is 3.3V, output 1.5V), 15A is not much, but 80mOhms is notably worser that the 50mOhms it is there AND more resistance when current flow = more heat! And we did not like heat, did we? Also the rise time is 8.5x slower that with the original mosfet (6nS only!), while the shutdown is rougly same.
But with same gate charge is there a huge problem (hence the 60V unnecessarity) with the gate treshold. That is very very high 2.7V, while the original works at 1.2V. Therefore this mosfet probably will never even work in the mainboard... :(
...but from this very interesting link you posted:
Vishay - MOSFETs - N-channel - DPAK (TO-252) package
...I choose this one:
20V, 6mOhms, 26A, rise time 10nS, shutoff time 24nS
gate treshold 0.8V, gate charge 19nC
Even that at 4.5V the resistance is actually 9.5mOhms, then it is still far better that 50mOhms.
Also the mosfet can operate at 175°C, witch is pretty high.
While it is a bit slower (rise time 10 to 6, shut off time 24 do 20), the gate treshold 0.8V should compensate that a bit for the original is 1.2V... The slightly higher gate charge 19nC over 15nC should not be a problem.
I believe I found the perfect replacement, that is better than the original!
"It is dangerous to be right in matters on which the established authorities are wrong." - Voltaire
...just keep folding, just keep folding...
Last edited by trodas; November 9, 2013 at
My System Specs
Pentium 4 650 3400MHz
2048MB OCZP4001G 2-3-2-7 200MHz 2.60V
PNY 6800GT 256MB DDR3 350MHz/1GHz
500G Western Digital 16MB cache (WD5000AAKB)
Enermax 620W Liberty
Onboard MSI PM8M3-V
NEC DV-4551A (16x DVDRW)
iiyama ProLite E1980SD 1280x1024 75Hz DVI
Windows 2000 SP4 CZ
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