ASRock z77extreme4 will not use all 4 RAM slots

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phenal

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Feb 13, 2016
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I have 4*4GB of the same RAM G-Skill F3-12800CL9D-8GBRL DDR3-1600 CL9-9-9-24 1.5v. Mobo is ASRock z77extreme4. All are working as I have tested them individually and various dual configs. A1 and B1 config works. A2 and B2 config works. A1 only config works. A1 A2 B1 B2 config only allows A2 and B2 to be active with a mention in the BIOS “System Browser” that all slots are occupied in the pictorial, but have a "none" in A1 and B1 on the main menu. One article suggested updating BIOS: I was on 2.70 and the most recent was 2.90. I updated to 2.80 and then to 2.90, but still no luck (Cleared CMOS). Some articles suggested a power supply issue but the power supply was recently replaced and the issue existed before; CX600 to CX750. Other threads mentioned changing timing and whatnot on the “DRAM Configuration” settings, but that is above my knowledge. The only other thing I can think of is it’s a problem with the mobo itself. How can I get all 4 sticks to work?
 
Solution
C
You can slow the clock speed by changing the DRAM Frequency to 1333MHz. See page 56 of downloadable manual.


GSkill FAQs:
http://www.gskill.com/en/faq/DRAM_Memory
Q:
I want to install more memory, in addition to my existing memory kit. What are my options?

A:
We do not recommend mixing memory kits, regardless of brand or model.
By mixing memory kits together, there may be compatibility issues such as unable to boot or unable to operate at rated specifications.

Each of our memory kit are thoroughly tested to ensure compatibility within each memory kit. And because we have not tested our memory kit with your existing memory kit, we cannot guarantee compatibility when multiple kits are used.

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Calvin7

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Feb 19, 2013
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G-Skill F3-12800CL9D-8GBRL is a 8GB (4GBx2) kit. G.Skill does not make any guarantees that combining two kits will work at all.

"How can I get all 4 sticks to work?"

Mixing kits allows you to do your own compatibility testing. This is not very economical. You can try running the memory at a slower clock speed.
 
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phenal

Honorable
Feb 13, 2016
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Yes, all slots work individually. I've tested A1 only, A2 only, B1 only, & B2 only with a single stick and it showed as 4096MB in every position. A minor error came up A6, SCSI Detect, on the mobo when I entered BIOS, but went away when I started my OS. This was true for all individual positions. After this, I tried switching out sticks and placing them in each slot. All 4 sticks work, individually, in all 4 slots.
 
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phenal

Honorable
Feb 13, 2016
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10,510


That is interesting. I've gone under the assumption that since all 4 are the same that they should work together. I guess I didn't read the fine print....

You've mentioned something about slowing the clock speed? Forgive me, I'm not completely tech savvy, but wouldn't that potentially damage the RAM if on a lower speed than recommended? If not, what would you recommend for a test? And where/what could I change? Is that the tRFC, the DRAM Reference Clock?
 
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C

Calvin7

Titan
Feb 19, 2013
11,725
334
76,490
You can slow the clock speed by changing the DRAM Frequency to 1333MHz. See page 56 of downloadable manual.


GSkill FAQs:
http://www.gskill.com/en/faq/DRAM_Memory
Q:
I want to install more memory, in addition to my existing memory kit. What are my options?

A:
We do not recommend mixing memory kits, regardless of brand or model.
By mixing memory kits together, there may be compatibility issues such as unable to boot or unable to operate at rated specifications.

Each of our memory kit are thoroughly tested to ensure compatibility within each memory kit. And because we have not tested our memory kit with your existing memory kit, we cannot guarantee compatibility when multiple kits are used.

 
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Solution
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thesilvershroud

Prominent
Feb 15, 2017
1
0
510


Same scenario here, I am very much encountering exact as this with my asrock z77 extreme 4, as well I tested each kit and slot and so, tried a1b1 and a2b2 channels, they are detected in cpuz and on the system browser of the bios.

When I insert all the rams, it only detects a2 and b2. In my scenario thouse its 4 single kits.

I already tried resetting the bios, bios is updated to the latest. I am thinking maybe its my cpu socket that has a problem, I already check but no bents or so (my cpu builtin graphics doesn't work anymore though).

Were you able to have a success with this? I tried experimenting around the overclocking section, but im new to it and with no success yet.
 
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uio7777

Commendable
Feb 10, 2017
2
0
1,510
Same scenario here, I am very much encountering exact as this with my asrock z77 extreme 4, as well I tested each kit and slot and so, tried a1b1 and a2b2 channels, they are detected in cpuz and on the system browser of the bios.

When I insert all the rams, it only detects a2 and b2. In my scenario thouse its 4 single kits.

I already tried resetting the bios, bios is updated to the latest. I am thinking maybe its my cpu socket that has a problem, I already check but no bents or so (my cpu builtin graphics doesn't work anymore though).

Were you able to have a success with this? I tried experimenting around the overclocking section, but im new to it and with no success yet.


did you get any solution on this issue. My Asrock Extreme 4 just stop recognizing 2 of my ram modules. Also my GPU integrated stooped being recognized.
 
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