[SOLVED] AsRock Z77 Extreme4-M - Memory Issue

[parisisal]

Hi all,
Hi have this configuration since 2012, and it has always worked well and it was very very stable :

• ASRock 1155 Z77 Extreme4-M
• CORSAIR DDR3 16Gb (4X4GB) 2133MHz CL11 Vengeance Red (CMZ16GX3M4X2133C11R)
• VGA GTX 1060 6GB (installed on 2018)
• Intel 1155 i7-2700k Ci7 Box (3,5GHz)
• LC POWER 650W OZEANOS 140MM PFC 80PLUS V2.3 (LC8650II)
• Dissipatore NH-U12S (installed on 2016)

Yesterday I found the PC in a strange state : video signal off, keyboard and mouse off but led and fan on. I forced the reboot, and in Windows I noticed that only 8gb has been recognized by the system (16gb installed).

In the bios I see this:

But in the system browser a I see all 4 memory modules :

So i did some tests :

If I install 2 modules in slot1 and slot3 : Ok (8gb recognized)
If I install 2 modules in slot2 and slot4 : Ok (8gb recognized)

I did some memory test with this configurations:

Module1 and Module2 on Slot1 and Slot3 : OK (2h memory test)
Module1 and Module2 on Slot2 and Slot4 : OK (2h memory test)
Module3 and Module4 on Slot1 and Slot3 : OK (2h memory test)
Module3 and Module4 on Slot1 and Slot3 : OK (2h memory test)

Instead if I test all the 4 module together, only 8Gb were recognized and I get many memory errors:

I also tried this :

• Clear CMOS (5 times)
• Remove CMOS battery
• Remove all SATA device
• Remove all USB device

But nothig changed.

I also tried to remove the VGA Card, but I can't see anything from the onboard card (no video signal) : it disappeared.

Could someone help me understand the problem ?

 

[RememberThe5th]

Try to scrub off RAM pins with eraser and dust off ram slow with soft brush. I hope that helps.

 

[logainofhades]

Just as an FYI, that PSU is not a good quality one. It could be part of your issue, due to unstable power delivery. I recommend replacing it, with a quality unit, before it kills your hardware, if it hasn't damaged it already.

 

[parisisal]

Try to scrub off RAM pins with eraser and dust off ram slow with soft brush. I hope that helps.

All the modules are working on all the slots :

1. Module1 and Module2 on Slot1 and Slot3 : OK (2h memory test)
2. Module1 and Module2 on Slot2 and Slot4 : OK (2h memory test)
3. Module3 and Module4 on Slot1 and Slot3 : OK (2h memory test)
4. Module3 and Module4 on Slot1 and Slot3 : OK (2h memory test)

I tried all the combiations.

 

[RememberThe5th]

Try bumping up voltage to 1.65V and see if that helps.
I agree with @logainofhades of PSU.

 

[parisisal]

I bought a new PSU.
Same problem.
Finally I bougth a new bios chip from ebay. I changed the bios chip and it worked!
Now I can see all the bios option, and now I can use 4 modules together.
Just 10€.