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Z77 Extreme4-M - Memory Issue

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parisisal View Drop Down
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    Posted: 13 Jan 2020 at 12:41am
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 ?

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parisisal View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote parisisal Quote  Post ReplyReply Direct Link To This Post Posted: 16 Apr 2020 at 4:35pm
I bought a new PSU : not worked! 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??
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