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About VRMs & Mosfets / Motherboard Safety with 125W+ TDP processors - Page 78

post #771 of 1100
Thread Starter 
Quote:
Originally Posted by Lum4r;13899129 
Explosive failure with an MSI 870-G45 with a Phenom X6 1090t at stock settings. Which I had seen this thread first, I'd have known that the "125W max" was a load of crap.

Really? frown.gif
You should tell us about it, perhaps provide pictures. The more data we can collect, the more we can assume about certain motherboards and which processors can be safely run at what levels with them.

Have you been on OCN before to check/lurk around/post anything, it seems to be your first post here. Welcome to the site!

Gear mentioned in this thread:

post #772 of 1100
Thanks for the kind welcome.
I've attached a picture of what I think is a transistor that blew. I don't have the best camera, but you can plainly see the small hole it made when it popped. Here is a high-def image of the mother board, courtesy of Newegg. It's the third transistor from the right.

Here's the full specs of the system:
-Rosewill 530W PSU w/ 41 amp single 12v rail
-The offending 870-G45
-A Phenom II X6 1090t at stock settings
-A cheap Rosewill heatsink; outperforms stock (or so I've heard)
-4GB (2x2GB) Hynix PC3-1333 RAM w/ 9-timings
-1 IDE DVD RW Drive
-3 SATA HDDs
-Geforce 9600 GT
-3 case fans

Here's exactly what happened. I put all of that stuff high-tech equipment into a case. Everything was checked and double-checked and ready for launch. I start the system up, and lo and behold everything working in perfect harmony. But this peaceful symphony would soon end badly. The first thing I wanted to do was make sure everything was stable, so I loaded up good ol' Prime95 for some torture trials. Not 30 seconds in, my computer shuts down. 'Ok,' I say aloud to myself, 'That's not good.' So I immediately unplug my PSU, and at this point I'm pretty sure it's overloaded, so I unplug the power to my extra HDDs and the DVD drive. I plug the PSU back in and try to start it back up, and what do I see? SPARKS! Straight out of the 12v plug for the CPU. I unplug it again and look over the motherboard carefully. Seeing nothing wrong I figure one of the capacitors hadn't discharged after the system shut off, and it was just some static looking for ground. I power the computer with the PSU unplugged to discharge it and attempt to start the machine again. Sure enough, it boots without fail. Now I think, 'Ok, I just need to go to Newegg and return this PSU while my system is still operational.' I get back to Windows and I start up my web browser, but before I can navigate anywhere, it shuts off again. This time it's not so quiet, however, producing an audible pop and sizzle. That's when the transistor went. And now here I am. On my old computer, I might add.

So the mobo is RMAing back to Newegg, along with the PSU in favor of two more reliable parts. There probably wasn't anything wrong with the PSU, but whatever gives me an excuse to get something higher quality.

Edited by Lum4r - 6/17/11 at 4:02pm
post #773 of 1100
Thread Starter 
That's on one of the main phases feeding the CPU. It appears to be the third transistor that they used in place of a proper MOSFET driver this time around (using a third transistor is cheaping out on the VRM design!) Looks like it simply blew.

What was this rosewill heatsink? A tower heatsink or did it blow down onto the mobo
post #774 of 1100
Tower, the air went up and out. Here's a link:
http://www.newegg.com/Product/Produc...-199-_-Product
post #775 of 1100
3 transistor isn't really cheaping out.

more like meeting a price point, which is what they wanted the G45 to do.
Alienware M9700
(14 items)
 
Wackbook pro
(12 items)
 
Mpowerlicous
(12 items)
 
CPUCPUMotherboardGraphics
AMD Turion ML-42 2.4GHz AMD Turion ML-40 Alienware nForce3 2X nVidia GeForce Go 7900GS SLI 
RAMHard DriveOSMonitor
1GB DDR 333MHz Samsung Spinpoint 250GB Windows XP Professional 1920X1200 Integrated LCD 
Case
Alienware M9700 chassis 
CPUMotherboardGraphicsGraphics
Core i7 3615QM @2.3GHz Apple Logic Board Intel HD 4000 Nvidia GT 650M 512MB 
RAMHard DriveOSMonitor
16GB 1600MHz DDR3 500GB Samsung 840  OSX 10.10 1440x900  
PowerAudioAudioAudio
85W PSU Schiit Modi Schiit Magni 2 Über DT770 Pro 
CPUMotherboardGraphicsRAM
Intel i7 3770K MSI Z77 Big Bang MPower Radeon R9 270X 4X4GB G.Skill  
Hard DriveCoolingOSMonitor
Intel X25-V Cooler Master Hyper 212+ Life without walls? Who needs windows? Acer 
KeyboardPowerCaseMouse
G15 Raidmax RX-1000AE Brooks shoebox  Acer G500 
  hide details  
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Alienware M9700
(14 items)
 
Wackbook pro
(12 items)
 
Mpowerlicous
(12 items)
 
CPUCPUMotherboardGraphics
AMD Turion ML-42 2.4GHz AMD Turion ML-40 Alienware nForce3 2X nVidia GeForce Go 7900GS SLI 
RAMHard DriveOSMonitor
1GB DDR 333MHz Samsung Spinpoint 250GB Windows XP Professional 1920X1200 Integrated LCD 
Case
Alienware M9700 chassis 
CPUMotherboardGraphicsGraphics
Core i7 3615QM @2.3GHz Apple Logic Board Intel HD 4000 Nvidia GT 650M 512MB 
RAMHard DriveOSMonitor
16GB 1600MHz DDR3 500GB Samsung 840  OSX 10.10 1440x900  
PowerAudioAudioAudio
85W PSU Schiit Modi Schiit Magni 2 Über DT770 Pro 
CPUMotherboardGraphicsRAM
Intel i7 3770K MSI Z77 Big Bang MPower Radeon R9 270X 4X4GB G.Skill  
Hard DriveCoolingOSMonitor
Intel X25-V Cooler Master Hyper 212+ Life without walls? Who needs windows? Acer 
KeyboardPowerCaseMouse
G15 Raidmax RX-1000AE Brooks shoebox  Acer G500 
  hide details  
Reply
post #776 of 1100
Thread Starter 
That's a link to the PSU. What was the heatsink you used?
post #777 of 1100
post #778 of 1100
Thread Starter 
Ah, simple tower cooler. Not very high, but does blow over those VRMs. They didn't get any cooling, which added to the problem & risk.
Simple 3rd transistor is a way to lower the cost, but it can sacrifice quality and ability of a VRM system.

Your situation has been noted in the list of confirmed failures. Thanks for noting! Hopefully someone else will know before bad things happen, by looking at the list and seeing your example.
post #779 of 1100
Yeah, it's all pretty funny for me. I happened to sign up for a shoprunner trial, so they're covering return costs. Net cost to me for this oversight: $0. We should all be so lucky.

I'd also like to point out the irony of the fact that the installation guide that came with the board uses the marketing phrase "Big bang" on the font.
Edited by Lum4r - 6/17/11 at 5:01pm
post #780 of 1100
what about the msi 770-g45? ;o if its gunna blow up or catch on fire im getting a better mobo
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