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My computer burst into flames! MSI 890GXM-G65 - Page 27

post #261 of 300
Having worked with and having designed buck and boost converters, a MOSFET that's capable of driving the power that will be drawn will only blow because of one thing when working in switching mode:

An improper driver.

If the driver can't charge the gate on time, even if the delay is very very slight, that will build heat inside the MOSFET, eventually killing it.


An inductor mismatch will only cause poor efficiency, but won't blow up a MOSFET. Unless the mismatch is so big it causes the circuitry to draw abnormal currents due to very low efficiencies.


But on those kind of buck converter ICs the manufacturer states which inductor should be chosen, so I think it's more of a driver mismatch.
   
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post #262 of 300
The driver is most likely the issue for this board, others have used NIKOS IC's with improper current amounts for the application used (IE: Overclocking) which is what caused the burn on some of them.
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post #263 of 300
i not sure if this site is reputable but its pretty much all i could find for just the cpu and overclocking the cpu (power consumptions)

scroll to the bottom graph and hover over it with your mouse to make them go in order.
pay attn to the 1090T and the 9950
116watts vs 144watts respectively

http://www.behardware.com/articles/7...90t-1055t.html

now lets look at the overclocking section
scroll down just a bit to look at the graph (actually look at the text right above the graph)
http://www.behardware.com/articles/7...90t-1055t.html

i have my vid set at 1.375 and all other settings at auto.
im at 19xmulti with 200htt for 3800mhz
when i run p95 i see volts go up to 1.44v

according to that writing that means im pushing 188 watts already


here is my question
my board is actually out of warranty now...expired in may believe it or not.

can someone push their (warrantied board) little by little and find out exactly what it can do.

make sure the heat sink is covering all the vrm`s and that you have air blowing down onto them.

then raise the volts and multiplier only little by little while running p95 for at least 1 hr each time

let us know how far you can get until it blows

im at 188watts right now and i have went higher

i had tried 20xmulti with 200htt (4.0GHz) with 1.45v but i scared to go any higher
1 of my cores was failing right away while running p95
im betting i need to be close to 1.5v to be stable

at least without someone telling me to look for some kind of sign/temp before they blow
Edited by tdbone1 - 6/25/11 at 3:56pm
    
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post #264 of 300
Msi=Death by VRM blowing up and burning the house down to the ground!
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post #265 of 300
Quote:
Originally Posted by tdbone1 View Post
i not sure if this site is reputable but its pretty much all i could find for just the cpu and overclocking the cpu (power consumptions)

scroll to the bottom graph and hover over it with your mouse to make them go in order.
pay attn to the 1090T and the 9950
116watts vs 144watts respectively

http://www.behardware.com/articles/7...90t-1055t.html

now lets look at the overclocking section
scroll down just a bit to look at the graph (actually look at the text right above the graph)
http://www.behardware.com/articles/7...90t-1055t.html

i have my vid set at 1.375 and all other settings at auto.
im at 19xmulti with 200htt for 3800mhz
when i run p95 i see volts go up to 1.44v

according to that writing that means im pushing 188 watts already


here is my question
my board is actually out of warranty now...expired in may believe it or not.

can someone push their (warrantied board) little by little and find out exactly what it can do.

make sure the heat sink is covering all the vrm`s and that you have air blowing down onto them.

then raise the volts and multiplier only little by little while running p95 for at least 1 hr each time

let us know how far you can get until it blows

im at 188watts right now and i have went higher

i had tried 20xmulti with 200htt (4.0GHz) with 1.45v but i scared to go any higher
1 of my cores was failing right away while running p95
im betting i need to be close to 1.5v to be stable

at least without someone telling me to look for some kind of sign/temp before they blow

I tell you what,you buy me one and I will do it.
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post #266 of 300
I'm not sure who would be willing to do a test though it is an interesting idea. I'm more inclined to believe it differs per board, the voltage one uses (which may be different with every chip), the cooling, and the conditions (ambient temp). It may not end up being that accurate a test.

Meanwhile tdbone1 you will want to keep that 1090T at stock or less because the board is out of warranty. There have been some cases when a VRM fail incident has taken the CPU and/or PSU, sometimes even a stick of RAM apparently.
post #267 of 300
Quote:
Originally Posted by Artikbot View Post
Having worked with and having designed buck and boost converters, a MOSFET that's capable of driving the power that will be drawn will only blow because of one thing when working in switching mode:

An improper driver.

If the driver can't charge the gate on time, even if the delay is very very slight, that will build heat inside the MOSFET, eventually killing it.


An inductor mismatch will only cause poor efficiency, but won't blow up a MOSFET. Unless the mismatch is so big it causes the circuitry to draw abnormal currents due to very low efficiencies.


But on those kind of buck converter ICs the manufacturer states which inductor should be chosen, so I think it's more of a driver mismatch.
I have heard somewhere else it's a driver/BIOS issue and that could be the case. According to what I read, it was stated as a problem in the BIOS causing it and the newest BIOS was supposed to fix the issue.
I've been able to go over 4.3 easily with my 790FX GD70 no prob using a 720BE and a 555 BE chip for each run and know I was taking a risk by doing so but the system seemed to supply what was needed to pull it off. Could be this board is one of those that everything is "Just Right" to do it without an issue.
I agree with XD's statement, don't push that Thuban past stock with your present board, just let it run as is until you can get something you know won't have problems with it.
I'm sure if the new 990FX will continue this trend, we'll hear about it soon enough. If you decide to take a chance on one, for now I'd look for an open box board so you'd have less $$ invested if it all goes South.

Speaking of open box deals I did score a decent ASRock board (P43DE3) for my 775 setup earlier and was a good deal at under $50.00. The board clocks up well and seems to perform as I had expected.
All I really need for it now is a good 1333 chip and I can turn it loose.
Edited by Kryton - 6/26/11 at 1:17pm
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post #268 of 300
Quote:
Originally Posted by Kryton View Post
I've been able to go over 4.3 easily with my 790FX GD70 no prob using a 720BE and a 555 BE chip for each run and know I was taking a risk by doing so but the system seemed to supply what was needed to pull it off.
4.3 with a triple core?
even if you unlock it to a 4 core its nothing like a 6 core as far as drawing power.

those things (6 cores) suck it down
    
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post #269 of 300
Quote:
Originally Posted by tdbone1 View Post
4.3 with a triple core?
even if you unlock it to a 4 core its nothing like a 6 core as far as drawing power.

those things (6 cores) suck it down
This one doesn't unlock but clocks up well. Check out the list here:
http://www.overclock.net/amd-cpus/47...00-series.html

I can deal with it not unlocking since my 555 does fully and is stable. Biggest prob there are temps but I normally don't bother to run it that way, I just let the usual 2 cores do the job.
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post #270 of 300
4 phases is plenty for an X6...
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