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AMD Motherboards - VRM info database - Page 110

post #1091 of 1214
11/18/12 at 11:58am
Quote:
Originally Posted by nz3777 View Post

Someone help out the blind over here I didnt see ASUS M5A97 lol.

 

It's 4+1, would be fine for Phenom II x4 or FX-6300 overclocking. Not sure about FX-8300 chips though.

 

Quote:
Originally Posted by nz3777 View Post

Sorry to get off subject guys whats the best amd board am3+ in your opinion? Crosshiar asus? anyone know where i can get a good deal on 1?thumb.gif

 

Sabertooth 990FX R2.0, Crosshair V Formula-Z, AsRock Fatal1ty 990FX, & Gigabyte 990FXA-UD5 or UD7.

 

If you want a budget board then Gigabyte 990FXA-UD3 or Bioware TA990FXE. Both boards can overclock as well as the other guys; but they do not have as many features.

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post #1092 of 1214
11/18/12 at 10:56pm
Least i know why I Cant Seem To Push My System Past 4.0 Ghz
Right now I Am @ 3.923 Ghz Bench Stable . As Soon as I Bump it up a Tad More System Locks up
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post #1093 of 1214
11/20/12 at 10:15pm
Quote:
Originally Posted by KarathKasun View Post

I found some interesting info on the MOSFETS that seem to be common on low end and mid range gigabyte boards (2SK3919).
Power dissipation at 100c is 15w. 4x3 setup (4 phase 3 transistor per phase) its good for 120w @ 100c.
The sturdy FET's mentioned for the DFI 790FX board (AOD472) are rated for 25w at 100c. Same VRM config is good for 200w @ 100c.
Just goes to show how much impact quality components can have on a boards power output characteristics.

Interesting!

From: http://www.datasheetcatalog.org/datasheets2/17/171458_1.pdf
Their Rds of 5.6 mOhm is only a little better than the dreaded NIKOS P0630s found on the notorious 870A-G54 and other MSI wonders. rolleyes.gif They may well be built better, however, and thus be more resistant to degradation and eventual thermal runaway / meltdown. (I suspect some of the NIKOS destruction is due to the simple fact that the transistors are not meeting their stated specs.)

At any rate, TO252 mosfets with Rds values as low as 2 mOhm are out there. They are a bit more expensive and, having a physically larger junction, would likely require more robust (= $) mosfet drivers. That said, even the top-of-the-line hardware costs only a few tens of cents more than the cheaper stuff. For a few bucks, the motherboard manufacturers could install mosfets with ~3x the power capacity. mad.gif
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post #1094 of 1214
11/20/12 at 10:29pm
Quote:
Originally Posted by cdoublejj View Post

I would just assume have the air going over them instead of doing all that work for temporary heat sinks.

Yea.
Besides, even with additional heatsinks strapped on top, the vast majority of the heat will go through the soldered base, into the motherboard. Cool the motherboard and you cool the MOSFET, as well as all the other VRM components that get hot. Heatsinks won't hurt, unless they block airflow to the board, but IMO they may not help that much either. AFAIK, the black mosfet body is made of some manner of plastic or epoxy, depending on the mfg. Unless special compounds are used, this sort of material has a rather low thermal conductivity and, since the actual junction is buried several mm of this plastic, the heat has a hard time making it to the surface. The junction IS attached directly to the metal tab on the bottom that gets soldered to the motherboard, so thermal resistance along that path is quite low.
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post #1095 of 1214
11/21/12 at 9:18am
Has anyone tried to upgrade their MOSFETs to better ones on-board? I know EVGA made an external upgrade, but I'm talking about direct replacement. Would such an attempt even work, or are there failsafes inplace that would prevent it from working?

Just curious for sake of discussion, not looking to make such an attempt.
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post #1096 of 1214
11/21/12 at 10:02am
Quote:
Originally Posted by Cheezman View Post

Has anyone tried to upgrade their MOSFETs to better ones on-board? I know EVGA made an external upgrade, but I'm talking about direct replacement. Would such an attempt even work, or are there failsafes inplace that would prevent it from working?
Just curious for sake of discussion, not looking to make such an attempt.

I'm somewhat determined to give it a try. Digikey has a wide list of Infineon MOSFETS to pick from (almost too many!) I haven't looked at all, but have found one with 2x better Rds resistance and similar gate charge values. http://www.infineon.com/dgdl/IPD031N03L_rev2.1.pdf These will literally produce half or less the heat of the NIKOS crap that's on the board now. ( 870A-G54 )
Edited by Geonerd - 11/21/12 at 3:32pm
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post #1097 of 1214
11/21/12 at 4:57pm
Quote:
Originally Posted by Cheezman View Post

Has anyone tried to upgrade their MOSFETs to better ones on-board? I know EVGA made an external upgrade, but I'm talking about direct replacement. Would such an attempt even work, or are there failsafes inplace that would prevent it from working?
Just curious for sake of discussion, not looking to make such an attempt.

 

It's really hard to do, especially with consumer grade soldering equipment.

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post #1098 of 1214
11/21/12 at 5:13pm
Quote:
Originally Posted by Tator Tot View Post

It's really hard to do, especially with consumer grade soldering equipment.

True, a Rat Shack slaughtering iron won't do more than narf the board.
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post #1099 of 1214
11/22/12 at 7:43am
Quote:
Originally Posted by Tator Tot View Post

It's really hard to do, especially with consumer grade soldering equipment.

Looking at photos of a whole bunch of different brand and model motherboards, it would be a tight soldering job, but, anyone who is experienced with soldering could do it. If I had a motherboard to sacrifice, I would absolutely try; I've been using a soldering iron since I was 13.

But yeah, a Radio Shack soldering iron wouldn't be the tool to get the job done, that's for sure.
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post #1100 of 1214
11/23/12 at 9:29pm
Thread Starter 
people have replaced mosfets (i think), but like has been said, it would be a super tight solder job.
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