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4690K on Z97X-SLI with G.Skill 2x8GB 2133MHz CL9

Hey guys,

Just upgraded my PC. I have:

CPU: i5 4690K
Mobo: Gigabyte Z97X-SLI
RAM: G.Skill 16 GB (2x8GB) DDR3 2133MHz CL9

(Quick look at my rig now: http://pcpartpicker.com/p/Bz2M6h)

When I initially installed everything, my computer got stuck in an on-off loop and wouldn't boot up. I eventually narrowed it down to the RAM. When I had two sticks in, the computer would get stuck in the loop, but with only one stick it was fine (I tested both sticks, they both work individually).

I have not yet overclocked my CPU, wasn't planning on doing so until I get a better CPU fan this week. I've been told the stock cooler is not good enough for overclocking.

So my question is: Why is my PC not booting when I have both sticks in, and how can I fix it?

Thanks in advance
14 answers Last reply Best Answer
More about 4690k z97x sli skill 2x8gb 2133mhz cl9
  1. Hi, Does each slot work with single RAM inserted?
  2. Yes, both of them work individually and can get into windows all fine. I'm on the PC at the moment.
  3. Have you tried clearing the CMOS (unplug the power cord and remove the CMOS battery for a minute), then insert both RAMs and see if working?
  4. I've cleared the CMOS by touching the two CMOS pins, and reset to factory defaults on BIOS startup.
  5. Try with the battery, power cord unplugged. If still the same, it might be a memory issue, or CPU socket bent pins.
  6. Make sure you have latest BIOS, sticks in proper slots, try enabling XMP - if no joy, may need either a slight OC of the CPU or additional MC (memory controller) voltage (can also try the sticks in slots 1-2 to see if a MC/slot issue)
  7. Tradesman1 said:
    Make sure you have latest BIOS, sticks in proper slots, try enabling XMP - if no joy, may need either a slight OC of the CPU or additional MC (memory controller) voltage (can also try the sticks in slots 1-2 to see if a MC/slot issue)


    I've enabled XMP, however the ram is still only getting 1.5V (needs 1.6V). I've done a slight overclock using the automated Gigabyte "performance upgrade" of 20%. However it seems the RAM is still only running at 1600 MHz.

    Dunno, I'm really new to overclocking, so could it be that using both RAM sticks only works if I've sufficiently overclocked?
  8. Try enabling XMP again, then manually set the DRAM voltage to 1.65
  9. Tradesman1 said:
    Try enabling XMP again, then manually set the DRAM voltage to 1.65


    I've set the voltage to 1.66 (was no 1.65V) and enabled XMP Profile 1. Still no love, just stuck in an on-off loop.

    Quite frustrating this, since both RAM sticks work fine individually. Starting to question whether I'm doing everything right...

    Thanks for your help so far
  10. Best answer
    Which slots are you using?

    They should be in the grey slots. If that doesn't work, try them in the first two slots furthest away from the CPU, or the two slots closest. If they work in that configuration, it is a defective motherboard. Let us know how it goes!
  11. If they work in the config that GSkill mentioned, it might also be the CPU is out of level or there may be bent broken pins - first try loosening the CPU cooler then snug it back down, not overly tight, many people overtighten in a corner or on a side throwing the CPU out of level contact with all pins which can affect the MC (memory controller)
  12. gskill support said:
    Which slots are you using?

    They should be in the grey slots. If that doesn't work, try them in the first two slots furthest away from the CPU, or the two slots closest. If they work in that configuration, it is a defective motherboard. Let us know how it goes!


    Looks like a defective motherboard then :(

    [CPU] [DDR3_4] [DDR3_2] [DDR3_3] [DDR3_1]

    Installed in DDR3_1 and 2 (grey slots) originally - didn't work.

    Then tried DDR3_3 and 4 (black slots) - didn't work

    Now, I have the sticks in DDR3_1 and DDR3_3 and it's "working". 16GB recognised in Windows.

    Until I get this issue sorted out (will get my motherboard looked at, still under warranty), what is the disadvantage of having the two RAM sticks installed in different coloured slots directly beside each other? Is it an efficiency issue, or something more serious?

    Thanks for all your help guys. Really appreciate it!
  13. Efficiency is one way to put it.

    It's not that serious because the computer will run fine, but you paid for dual channel and it runs as single channel.

    Theoretically speaking, it is half the bandwidth. It's support to be ~ 25.6 GB/s, now it's ~ 12.8 GB/s
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