08-19-2018 06:51 AM
08-19-2018 05:50 PM - edited 08-19-2018 05:51 PM
Check your BIOS/UEFI memory settings and disable Interleave Mode or Dual Channel modes if available.
Try moving the 4GB stick from slot #3 to slot #4 to make a paired bank. If this does not work, then install the 4GB sticks in slot #1 & #3 and put the 8GB module in slot 2. I'm assuming slots 1 & 3 are considered one bank and slots 2 & 4 are another bank. If my assumption is incorrect then adjust so the two 4GB sticks are using a single bank. Are there any other memory settings in the BIOS/UEFI settings that might affect it? Have you tried setting all memory settings to Auto or Defaults? Perhaps try resetting BIOS/UEFI settings to Defaults or Optimal Defaults.
Also try each 4GB stick by itself. It's possible one of them is bad.
08-20-2018 05:16 AM - edited 08-20-2018 05:30 AM
08-21-2018 07:13 AM
Is your motherboard firmware up to date?
If so then at this point I think you have a compatibility issue between the RAM, however, I don't know which one. My guess would be either the 8GB stick or the Corsair module is causing the issue. I'm not saying either one is actually bad, just incompatible in some way when installed together. Maybe a Crucial representative can check on the technical details of the 8GB stick to see if it could be interfering with the 4GB sticks.
08-21-2018 09:55 AM
Thank you for purchasing the Crucial products and your question. I’m sorry to hear that had difficulties with Crucial memory purchase. There is most likely a compatibilty issue causing the 8GB stick to only use 4GB. I would advised you to try the 8GB module with the Ballistix 4GB and the try the Cosair 4GB with and note the results.