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About VRMs & Mosfets / Motherboard Safety with 125W+ TDP processors - Page 55

post #541 of 1100
I don't think an Athlon II X4 will draw 150W on its own. Total platform draw, maybe, but that sounds like a figure for an X6.

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post #542 of 1100
Quote:
Originally Posted by xd_1771 View Post
I actually only have one posted with an 890FXA... (ask johnny.dot.exe for more details), but I do know it was somewhat of a trend with the old 790FX board and the x4 if you passed 1.5V for 24/7 OC

Meanwhile I just registered at hardforum, I'll be addressing them by linking them to the article here and perhaps providing assistance when necessary. It seems a lot of failures happen/are reported over there...

EDIT: Check this one out. A Jetway board blew in what was described as "failed choke". That's right, a smoking choke, not a MOSFET. This is definitely something new... I never even thought chokes could overheat and fail

I also just found out something about ASUS boards based on a recent post here on OCN and ones back on hardforum. They feature much better protection techniques. Once MOSFET temperatures are past a certain point (not CPU temps), the CPU throttles and/or the board shuts off. Looks like that's why I have never seen any ASUS VRM failure so far. However, that's still not to say that all ASUS VRMs are capable of pushing 125W.
Hmm,back in dec. of 09 I had a Jetway 890 board paired with an Athlon 240 in for testing.Running AMD overdrive's auto feature-the board blew at around 223 ref. clock.Took the CPU with it.Same thing,would power on,fans spin,no post.That's a 65w dual core.I wish I would have pulled the heatsink off and checked the VRM's.Sent the board back-I still have the CPU sitting in it's box.It is nice to see the community is finally getting to the bottom of this problem.
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post #543 of 1100
Thread Starter 
Well, that Jetway board example I found did feature smoke.
I'm not listing your issue down in the horror stories list due to no actual confirmation that it was the VRMs, but I'm definitely going to watch jetway boards with a cautious eye.
post #544 of 1100
Thread Starter 
Going through my VRM horror stories list to import into the new table, I found this for you reflex99:
890FXA-GD70 failed with x4 - looks like stock speed too. Boots without CPU power connector in, so definitely a VRM failure.
It was listed as "unknown processor" in my list but it turns out the guy had updated the post after I listed it
post #545 of 1100
This could be a really interesting experiment.

Can't wait to get one of these and throw it under dice.
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post #546 of 1100
definitely reading all of this later.
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post #547 of 1100
Hey xd_1771, I just noticed your compilation in the OP of failed VRMs. I used to have a MA770 something from Gigabtye who's VRMS died on me out of nowhere. I even think I started a thread or two.
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post #548 of 1100
Excellent thread!
Quote:
Originally Posted by xd_1771 View Post
A list of all AMD motherboards with detailed VRM information including quality/amount of phases can be found here.
Is there anything like this for Intel boards? How do you find out how many phases your board has? I'd like to learn more about mine.
post #549 of 1100
Quote:
Originally Posted by Princess Garnet View Post
Excellent thread!Is there anything like this for Intel boards? How do you find out how many phases your board has? I'd like to learn more about mine.
I haven't got arround to making a list for intel yet, and probably never will, since i don't know much about them.

in most cases, you can count the chokes (square cube things next to the mosfets)

On current intel boards there are a few different configurations.

For chipsets with graphics passthru (H67, H61, H55, H57, Q57, etc.) they are CPU CORE+IMC/QPI+GPU

So this board for example:


Has 5 chokes, indicating 5 phases. 3 for the CPU, 1 for the IMC/QPI, and one for the IGP. It would be refered to as 3+1+1.

For chipsets without an IGP passthru (P67, P55, X58, AM3, AM2+, 939, etc.), it is the same, but without the GPU phase(s).

This board for example:


has 8 chokes, which typically indicates 6 phases for the CPU cores, and 2 for the IMC/QPI, so it is refered to as 6+2

With older chipsets, and CPU that do no use an IMC (skt 775, 478, etc), you just omit the phases for the IMC/QPI.

This board for example has:


8 chokes. Since skt 775 does not have an IMC, they are all dedicated to the CPU cores. This board is refered to as an 8 phase board.


All intel CPU's since 939 i believe have used an IMC, and until llano releases, none will have on-die GPUs, so they are all "CPU cores+IMC/HT".

i hope that clears at least something up

EDIT: here is a diagram i made a while back (click to enlarge):


Red=mosfets
Green=chokes for CPU mosfets
blue= chokes for the northbridge mosfets
Edited by reflex99 - 3/28/11 at 5:44pm
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post #550 of 1100
Thread Starter 
An Intel board list would probably have to be huge and require lots of research and time; I don't mind doing one actually when I have more time, just that it hasn't been done yet.
Platform-specific VRM splitting info can be found in the OP.

doritos93: Be sure to shoot me a PM. Gigabyte 770s don't fail often but the 4+1 models do feature VRMs with a cheapish 3-transistor design that could be failure prone. I'd like to know more.
Edited by xd_1771 - 3/28/11 at 5:47pm
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