Motherboard or CPU issue?

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sl83r

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Aug 13, 2010
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Hello all. I'm currently having a slightly irritating issue happening. Sometimes when I do a cold boot, I notice that when I go into the BIOS that although the Mobo sees all 8GB of RAM installed it gets set to single channel mode, as a result when i boot into windows I only get 4GB useable(Windows 7 64bit does see all 8GB though). If i reboot and go back into the bios Then it will normally Indicate that I am Dual Channel mode, and when i boot back into windows all 8GB will be useable.

I have changed ram, tried different ram, tried various speeds. Swapped out psu, reseated ram and cpu.

My question is, is this a cpu issue since the mem controller is on the chip or a mobo issue?

System specs:
ASRock Fatal1ty 990 FX
AMD 8150 FX@3.6Ghz(no overclock)
8GB Corsair DDR3 1866 9-9-9-27 ram
MSI Geforce 570 GTX
Antec TP 750, 750 watt supply
Windows 7 Pro 64bit

EDIT: I had an issue with a sound blaster fatality card in that sometimes the card would appear in device manager and other times it would not. This leads me to believe that it may be a mobo issue?

I should have added this a bit ago...but in the begining of april I replaced motherboard and problem has not come back since.
 
Solution
genz
Your motherboard has got to go. Sounds like it definitely has something dodgy going on on the traces going to it's northbridge, if not damage to the bridge itself. Is there any signs of scuffs near the processor on the motherboard?

Either way, get rid of it before it damages the rest of your components. If data is getting lost in transit during POST then you likely have connections on the mobo that are cutting intermittently. While running the PC that kind of thing can be deadly to your hardware.
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sl83r

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Yes I have 2 4gb sticks, in the black slots though...A2 and B2. If I put into A1 and B1(red slots), machine will fail to post.
 
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genz

genz

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Oct 8, 2012
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Your motherboard has got to go. Sounds like it definitely has something dodgy going on on the traces going to it's northbridge, if not damage to the bridge itself. Is there any signs of scuffs near the processor on the motherboard?

Either way, get rid of it before it damages the rest of your components. If data is getting lost in transit during POST then you likely have connections on the mobo that are cutting intermittently. While running the PC that kind of thing can be deadly to your hardware.
 
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sl83r

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Aug 13, 2010
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Thanks, I was thinking motherboard myself, I was more or less looking for a second opinion to validate my conclusions. I certainly won't be going ASRock again, as this is the second bought I have bought from them that has gone more or less belly up. Boy do I miss the old days when ABit was around! Never had a single problem with their boards.
 
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