Maximus VIII boot problem

africsnail · Jul 16, 2017

Hello,

I have problem with my new PC.
My PC:
mobo: Asus Maximus VIII hero
RAM: Corsair Vengeance LPX 3000Mhz
CPU: Intel core i5 6600k

I can boot it with both ram sticks in B slots but not in dual channel (A2, B2 or A1, B1). With 3000Mhz I get error 49 and with 2133Mhz i get error 55. If I press MemOK button I get AC code with DRAM led flashing. It is set to XMP mode.
I can't boot it with one stick in A slots. I've already tried higher DRAM voltage to 1.4v and I've updated BIOS to the newest version.

Is there fix for that? And what is the speed difference between having 2 sticks in one channel and 2 sticks in dual channel.
Thank you very much for helping me.

alexoiu · Jul 16, 2017

Hi,
Try removing the CPU and checking the socket, for ruling out a bent pin issue.
You can post a picture of the CPU socket here.

africsnail · Jul 16, 2017

alexoiu :

I think it's not the CPU issue, because I had the same issue with Asus Z170 Pro gaming motherboard.

alexoiu · Jul 16, 2017

It might be the CPU, then... Hard to say without checking.

africsnail · Jul 16, 2017

alexoiu :

Ok, I'll check it, but do you have some other solution that I can do from BIOS or windows without removing the CPU? Thank you

alexoiu · Jul 16, 2017

No. It looks like hardware related. You can also try testing the board outside the case, to rule out a short, since same issue with 2 boards.

africsnail · Jul 16, 2017

alexoiu :

But it's working perfectly with 2 sticks in one channel

alexoiu · Jul 16, 2017

Ok, but 2 slots are dead...

africsnail · Jul 16, 2017

alexoiu :

Ok, I checked it and I think that any of slots aren't bended. You can check it yourself (http://)

alexoiu · Jul 16, 2017

Pins look ok. Now try taking the board outside the case, install the CPU, CPU cooler, insert single RAM module in the A slot and test.

africsnail · Jul 16, 2017

alexoiu :

*pins

alexoiu · Jul 16, 2017

Meaning?

africsnail · Jul 16, 2017

alexoiu :

Still same

alexoiu · Jul 16, 2017

Then I'd RMA the CPU.

africsnail · Jul 16, 2017

alexoiu :

How large is the speed difference between having two sticks in single channel and in dual channel in your view?

alexoiu · Jul 16, 2017

No noticeable difference. The drawback comes from not being able to use the 4 slots, if ever needed. And now the CPU is still under warranty.

africsnail · Jul 16, 2017

alexoiu :

OK, I'll do it, thank you very much

alexoiu · Jul 16, 2017

You're welcome. Let's hope that it will solve the problem.

africsnail · Aug 25, 2017

Still same after RMA

alexoiu · Aug 25, 2017

Try loosening a bit the cpu cooler. If still the same I have no other idea.

africsnail · Feb 22, 2018

After a long time I decided to fix it. The problem was in the CPU cooler mounting stick (where you put the screws in). After full reassembly of my PC, it finally works. But since that time my pc crashes after about 10 minutes of playing games on it. I also tried to mine cryptocurrency and it is crashing too with green stripes on the screen. Q-Code on the MB is same like normal (AO). Both gaming and mining were working before the reassembly. Please help.

alexoiu · Feb 22, 2018

Crashing meaning?

africsnail · Mar 1, 2018

Crashing meaning freezing without any sound and turning pheriphals off, but still like "running"

Maximus VIII boot problem

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