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Memory slots not working after BIOS update

I have an ASRock FM2A85X Extreme4-M motherboard. I recently updated the BIOS to the latest version (1.80), and rebooted. The screen went blank, and I couldn't figure out what was going on. Every time I tried to reboot nothing would display on screen. No POST, nothing.

Once I removed one of my RAM modules it booted up fine. I have 4 RAM slots:

* DDR3_A1
* DDR3_A2
* DDR3_B1
* DDR3_B2

Before I upgraded the BIOS:

* DDR3_A1 -> 8 GB DDR3-1600 RAM
* DDR3_A2 -> (empty)
* DDR3_B1 -> 8 GB DDR3-1600 RAM
* DDR3_B2 -> (empty)

Worked just fine. You may recognize that this is a dual-channel setup.

After the upgraded BIOS, only one configuration would work:

* DDR3_A1 -> 8 GB DDR3-1600 RAM
* DDR3_A2 -> (empty)
* DDR3_B1 -> (empty)
* DDR3_B2 -> (empty)

I tried it with both RAM modules, and both worked individually using the above setup. I've tried a non dual-channel setup with A1 and A2, and I've tried a single-channel setup with B1 only.

Any ideas?

Thanks in advance,
Joe
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  1. Best answer
    With the one good stick, go into the BOS and set up the DRAM settings freq to 1600, appropriate timings, CR to 2N and in DRAM voltage add + 0.05 to the DRAM's spec voltage
  2. That's a lot of information, lol. I'm using this PC for work so I can't mess around with it too often. I didn't see a value of 2N for CR, and I was too nervous to mess with the voltage of the RAM. I don't want to over-clock anything, I just want it to work the way it did before.

    I do have some updates though. ASRock has made 8 different versions of the BIOS available [here](http://www.asrock.com/mb/AMD/FM2A85X%20Extreme4-M/index.asp?cat=Download&os=BIOS&Model=FM2A85X%20Extreme4-M). I flashed each version one at a time. It looks like any version after 1.30 exhibits this behavior of crashing with the 2 memory modules installed. It just so happens that wen I view the CPU compatibility page [here](http://www.asrock.com/mb/AMD/FM2A85X%20Extreme4-M/index.asp?cat=CPU&os=&c=) it lists my AMD A10 6800k, but only for BIOS versions 1.4 and up. Maybe my CPU is running in a compatibility mode right now, but according to ASRock's website it's not supported until I upgrade my BIOS.

    So something that they changed between version 1.3 and 1.5 (1.4 is not listed) breaks my dual-channel memory configuration. I'd be more willing to try messing with the "CR" setting if I knew more of why it's worth trying, as I don't quite know what it does. Still a bit nervous messing with the spec voltage, but if you can reassure me that it's not super risky I'm willing to try it.

    *EDIT: Mod, I'm a noob. Mind moving this into a reply to Tradesman1? Thanks.
  3. Tradesman1 said:
    With the one good stick, go into the BOS and set up the DRAM settings freq to 1600, appropriate timings, CR to 2N and in DRAM voltage add + 0.05 to the DRAM's spec voltage


    Despite what I wrote below, I ran out of things to try and just tried this. On my motherboard the CR was either 1T or 2T. I set it to 2T and tried installing the second module. Seemed to have no affect.

    I set everything back to stock voltages and auto CR value, and I'm running under 1 module now. Anything else I can check?

    Thanks in advance!
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