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About VRMs & Mosfets / Motherboard Safety with 125W+ TDP processors - Page 101

post #1001 of 1100
I wish I didn't have to worry about this. If I put a shroud on my H60, it'll end up hovering over the VRM's and therefore blocking airflow. frown.gif And before someone says just add a 92mm fan or something... I'm trying to keep it quiet to keep my wife happy.
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post #1002 of 1100
Quote:
Originally Posted by Krusher33 View Post

I wish I didn't have to worry about this. If I put a shroud on my H60, it'll end up hovering over the VRM's and therefore blocking airflow. frown.gif And before someone says just add a 92mm fan or something... I'm trying to keep it quiet to keep my wife happy.

 

There are plenty of quiet 92 mm fans out there, like the Scythe PWM one.

 

Another alternative is using a RAM cooler like I did in my Canary Red build to cool the VRM area.

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post #1003 of 1100
Quote:
Originally Posted by axipher View Post

There are plenty of quiet 92 mm fans out there, like the Scythe PWM one.

Another alternative is using a RAM cooler like I did in my Canary Red build to cool the VRM area.

RAM cooler won't fit so that option won't work.

I'm under the impressing that 92's are noisier than 120's?
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post #1004 of 1100
Quote:
Originally Posted by Krusher33 View Post

Quote:
Originally Posted by axipher View Post

There are plenty of quiet 92 mm fans out there, like the Scythe PWM one.

Another alternative is using a RAM cooler like I did in my Canary Red build to cool the VRM area.

RAM cooler won't fit so that option won't work.

I'm under the impressing that 92's are noisier than 120's?

 

So many things to take in to consideration when looking at fans.

 

In an ideal world where both a 120 mm and 92 mm fan are of the exact same design, the 92 mm man will need to spin faster to move the same amount of air and will therefore be louder.

 

But for cooling a VRM, you don't need massive airflow over them since the fins are so widely spaced and thick, you're looking more for just some general directional airflow to remove the heat that is coming off of the heat sink.

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post #1005 of 1100
Allow me to add another horror story, and this one is really ridiculous (on my part and the boards). I use an MSI 760GM-P35, because I couldn't afford better. I was doing a stability test for a modest 3.8Ghz OC on my Phenom II 965. I had the voltage set to auto, because that made the most sense at the time. The range of possible values was something like 1.3-1.55, but I didn't think that the board would apply more voltage than it could handle. I was wrong. A couple minutes into the test, I get a critical failure and a restart. It POSTs and boots up fine. So I'm thinking that was weird but that it shut down to prevent any damage. Again, after a few minutes the same thing happens, but I notice a smell this time. Something definitely fried. I go to check and I see two chips burnt and smoking. I didn't know what they did at the time, until I did a bit of research. Makes perfect sense now. Could've been worse; RMA took about 3 weeks, though. Here's a picture I took.

450

DATA:
  • Feb 1, 2012
  • MSI 760GM-P35
  • Phenom II x4 965BE, 3.4GHz (125W)
  • Running at 3.8GHz @ ~1.4-1.5V
  • Xigmatek Gaia Cooler
post #1006 of 1100
Thread Starter 

^ Will add the above :/ soz, but you do realize that MSI did not rate that board for 125W TDP processors.  Having the GAIA and no VRM cooling did no help either.  You basically set yourself up for a VRM failure.

 

As for today, New failure: Stock speed, stock cooler on the board with the toughest failure record

post #1007 of 1100
Very nice article, learned a ton from reading it.

I have a question about my X58 Sabertooth. ASUS list it as having:

-8 -Phase CPU Power
- 2 -Phase Memory Power
- 2 -Phase VTT_CPU Power

It follows that 8+2 that you said for 1366, but with the exception of the 2-phase VTT_CPU. What is the VTT_CPU?
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post #1008 of 1100
My third MSI 890FXA-GD70 is failing. Randomly crashes after putting stress on the system. Back the clocks back and volts for now. Doing the same thing as my second board, system cuts of and it boot cycles with a FF code. Pulling the power cord and holding the power button seams to reset it. After booting and checking the DrMOS temps in the bios, they are all 70C+, but the heat sink is barely warm to the touch. Definitely something up with the heat not getting to the heat sink.
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post #1009 of 1100
Thread Starter 

OCScrub: CPU power is arranged as 8+2 phase - 8 to the CPU and 2 to the CPU-VTT which is basically like the CPU-NB on AM3 platform.  The 2 memory phases that are listed are not part of this same VRM system and run off the 24-pin motherboard connector, powering the DDR3 memory.

post #1010 of 1100
Thread Starter 

Hey guys, check this out

 

Guys on MSI forums telling people that VRM heatsinks are useless

 

I really like where MSI themselves have been going by not ignoring that they have quality control issues, placing warnings on the appropriate board pages and acknowledging that their VRM designs have gone awry and attempting to improve those designs - and they have in the past few.  MSI finally introduced some boards with higher phase count and quality control while awry at times (I just recorded a 990FXA-GD65 failure) is really getting up there.  It's raising my confidence in their abilities in design.

 

But this... this just has me really disappointed. I'm not entirely sure if bas actually works for MSI but I'm just disappointed.  We have documented cases of the addition of VRM cooling having stopped CPU protective throttling issues on ASUS boards because the VRMs become much cooler and thus able to handle the load.


Edited by xd_1771 - 8/25/12 at 1:29pm
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