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my 890fx-gd70 got cooked - Page 5

post #41 of 60
Quote:
Originally Posted by jacky82 View Post
Yes it is true. My fxa890-gd70 was die after ran prime95 in 5 mins. But i didnt see any smell . Now i dont know which mainboard can handle the amd x6. Any good idea?
So far, I'm doing really well. Prime95 over 24 hours and stable. Even ran several series of LinX tests and IBT. For good measure, I performed OCCT as well.

No crashes, temps stay at around 52-54c under load.

But... I'm going to tell you right now that you're throwing too much voltage on it. Let me see if I can get a pic of my voltages or at least write them down. I did things a little differently. 4.05 Ghz.

But, you need to know that the thermal pads on the NB/SB/MOSFET are not completely on properly. CHECK THEM.

EDIT:

I also set my VDD to 1.425 and CPU volts to auto. They scale up accordingly and that's ok. 1.4875 is way to high for 1055t.
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post #42 of 60
Here are some screenshots so far.


And another showing memory information.

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post #43 of 60
1.4875 IMO is way way way too high for the 1055T cpu. You don't need it. I tried it that high and the mobo was going into protection mode. Yes it has one.
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post #44 of 60
Quote:
Originally Posted by bluepiglet View Post
wow, another failed 890fx from msi : http://www.overclock.net/amd-motherb...a890-gd70.html

still happened despite of pre-cautions from me and another forum memeber.

is there any one actually is using the hexcore with the board but didn't end up losing it?
i am. knock on wood. but im not trying to push it to 4 GHz. I've been running at 3.5 for two weeks or so and have not had any problems as of yet. Ill post in here if it fails and then join the "I fried my msi 890 fxa-gd70 club.
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post #45 of 60
I'm running it, but I don't have links to anything yet.
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post #46 of 60
Quote:
Originally Posted by Veranor View Post
This motherboard says it supports 6-core, but cannot handle significant overclocks with it. The mosfet simply cannot handle the amount of power the CPU needs.

I tested this theory by overclocking the 1055t to 4.2 GHz. Everything ran okay, Prime95 ran just fine. When I went to Linx, or Intel Burn Test, the capacitors around the mosfet started to whine. About 20-30 seconds later, the motherboard went into protection mode due to overheat and shut everything off. The CPU temps never went over 53c. The NB never went over 40c.

Taking this same test, I turned 2 of the 1055t's cores off. Linx and IBT ran smoothly and there was no whining coming from the mosfet capacitors.

Conclusion:

This board was never meant to handle 6-core CPUs. Get your money back if you can, because any "stable" overclock with the 1090 or the 1055 just means the inevitable is delayed.

I have not tried aftermarket mosfet cooling, but I am stongly considering it. I did not want to buy a new mobo, but will if I have to.
The whining you're talking about is coming from the chokes, as they actually do vibrate, in some cases audibly, from the power passing through them. Why are they whining more? The voltage passing through them is fluctuating more, indicated one of the DR MOS chips is probably overheating, and about to die.

I've also noticed from my own issue with the board, and others, that enabling Green Power seemed to cause most of the issues, as it seemed to load up one or two of the MOS chips, which caused more heat, and only kick in the others when absolutely needed. The actual power savings were also minimal at best (1 or 2 watts max) from what my board measured.

Considering the Thuban chips are rated for (at most) 125 watts TDP, and the motherboard is for 140 watt models (C2 965BE) along with the Phenom 2 x4 and x6 chips using identical pinouts, I would say the board should handle things just fine, unless the chips are not being cooled. In my above post I mentioned previously having a C2 965 chip. I ran it for ~6 months without power issues, although a week before dropping in the 1090T I noticed power fluctuations starting to show. The 965 was OC'd to 3.8 Ghz on stock voltage. It ran that way from the second week I owned it, once I put a better heatsink on (was waiting on a Zalman 9700, and ran stock in the meantime). That C2 was a power hog compared to a 1090T, and temps showed it.

Once I had dropped in the 1090T, voltage fluctuations went down a little, and after a little while the whole board died. I heard no whistling, and my computer noise is barely above ambient, so I would've heard it.


On another, semi-related note, I was able to take the heatpipe heatsink off, crimp the pipe, solder, and detach the NB from the VRM side of the heatsink. It works well, and I'd wanted to use it on my new Gigabyte board, but the actual mounts are backward. Such is life :-/. Anyway, I still think the boards are fine IF the MOS chips are properly cooled.
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post #47 of 60
So lets say its a cooling issue then.

If someone made an aftermarket heatsink for the GD70, I would be a customer. I don't want to have to buy a new board for something that should have been right to begin with, unless MSI is willing to RMA (I don't think so). And I don't want a watercooled one. I only have one loop right now.

Now... the million dollar aspect of this: if the MOSFET chips are arranged in such a way that the middle ones are lower than the outer ones, MSI should issue an unconditional recall IMMEDIATELY. That is a huge defect, one that would give people with stock settings a run for their money as well. Even if you don't see it... chances are your mobo won't last as long as the ASUS or Gigabyte equivalent.

Just an opinion.
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post #48 of 60
Same problem with an MSI 890 + AMD 965. 15 minutes in to Prime95, the system shut down and would just flicker on for a split second when I tried to turn it back on. Unplug the 8pin and everything would power up, just wouldn't boot.

RMA'd the PSU and MB, since I wasn't completely sure which one it was at the time...Newegg replaced both. Looking back, it had to be the MB that took a dump and the "flicker" was just the PSU going in to protection mode when that 8pin was plugged in.

My settings in BIOS were...

FSB = 250MHz(200MHz was default)
CPU Multiplier = 16x(17x was default)
NB = 2000MHz(the bump to FSB cranked this to 2500MHz, caused instability so I turned it back down to default)
CPU VDD = 1.475v
CPU Voltage = 1.475v

As you can see, only the FSB / CPU Multi / CPU VDD + Voltage were increased, with voltages quite a bit lower than what I see many other people having to use with the same setup. It is beyond me how these settings caused the MB to fail.

What confuses me is the fact you have to adjust CPU VDD + Voltage in order to increase the core voltage. Just increasing CPU Voltage does nothing, CPU-Z still reported default 1.375v.

I haven't pulled any of the OEM heatsinks because I don't want to void my warranty.
Edited by johnny.dot.exe - 7/4/10 at 9:44am
 
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post #49 of 60
Could this issue with the MSI 890fx have something to do with the fact you have to adjust CPU VDD to increase the core voltage, since increasing CPU Voltage does nothing?
 
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post #50 of 60
Thanks for the input from this thread (and from johnny.dot.exe too) Im going to exchange my MSI for a Gigabyte A-890FXA-UD5 tomorrow, I still have the return window from the store (15 days) and will just have to pay a few extra dollars.
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