10-30-201307:27 AM - last edited
3 weeks ago
by ROGBot
Windows is only seeing 24GB of my 32GB Corsair Vengance Pro memory (bought as a 8GB x 4 kit). The Bios also reports 24GB total memory even though it shows all four 8GB modules:
Troubleshooting steps I've taken so far:
At first Windows would only see 16GB. I was using Windows 7 Home and upgraded to Pro so there was no longer a 16GB limit, but it was now only seeing 24GB after the upgrade
Tried each stick 1 at a time in the first slot and was able to boot into windows with 8GB showing for each stick
Cleared CMOS with only 1 8GB stick present, booted to windows, shutdown and installed all 32GB
Installed latest BIOS [*}Did a memtest86+ 1 stick at a time, all passed
The QVL lists the Corsair Dominator 8GB x4 kits but not the Dominator Pro which I have, not sure if that is the issue. Any ideas what the issue might be?
If you're not running the latest BIOS, please update to the latest one using a USB pendrive and the EZ Flash Utility in the BIOS. Also have you tried doing 1 to 2 cycles of Memtest86+ on the whole kit after running tests on them individually?
This platform will drop DIMMs or ranks if the memory isn't stable or has a fault. If all the slots work individually, then it's down to settings. If one slot does not work then CPU socket might have bent/misalinged pin, DIMM socket issue, BGA issue under socket or trace issue. This is all assuming all four DIMMs work individually.
If it's a setting issue, you can also enable MCH Recheck in the DRAM Timing section of UEFI. Doing so will force the memory controller to keep retraining DIMMs that don't map first time. The board will loop POST routines and this will extend POST time. Of course, one can negate that happening by altering any timings that are too tight and tuning voltages. But I'll let you debug everything above first.
All sticks fail in slot B1 and work in the others. So I will check for bent pins on the cpu, and if it's not that, should I RMA the mobo at that point?
Hi, You have the same problem as me. On my board fail slot C1. I tested this slot on two kits of memory (Crucial and Corsair), in both cases did not work slot C1. It looks like X79 Deluxe have trouble with memory slots :-(.
Dream as if you'll live forever...Live as if you'll die today.....