After reading the recent article about adding more RAM I decided to upgrade my system. Everything arrive and looked good, I installed the 3 extra sticks of RAM and the PC booted ok, but I notice that POST only showed 4GB. Also I disconnected all the cords and my keyboard didn't activate when the PC first got turned back on, but it did after the next reboot. After I rebooted, I checked system properties in Windows and it now just 4GB instead of 12GB like I was expecting. It seems like they are all seated, they are flush with each other at least. All of the retaining locks are closed in.
If I can check each DIMM slot in the BIOS and CPU-Z and it shows information for all 6 slots as filled, and CPU-Z reports 12288GB installed.
Specs. The system seems to be stable with all 6 sticks installed, it just reports 4 GB instead of 12GB. Before I added this, that 6 GB worked flawlessly, I've never had even a minor problem with this system's stability. It stays on all day to act as a WMC DVR and plays games and movies without issue.
Windows 7 Home Premium x64
Case: Antec Nine Hundred
Power: Antec Signature Series 850 watt
MotherBoard: MSI X58 Platinum SLI
CPU: Intel core i7 920 2.67Ghz Overclock to 3.32Ghz(reset OC to default for troubleshooting)
RAM: 6GB PC3-12800 1600Mhz (XMP) (tried default speed for troubleshooting)
Videocard: EVGA GeForce GTX 275
Soundcard: Asus Xonar D2X
Harddrive1: IntelX25-M SATA Solid-State Drive 80GB
Harddrive2: Western Digital SATA 1TB
Harddrive3: Western Digital SATA 1.5TB
BD-ROM: SATA LG Super Multi Blue
DVD-RW: SATA LG Super Multi
TV Tuner1:HDHomerun Dual ClearQAM/ATSC Tuners
TV Tuner2:Hauppauge HVR-1600
USB Xbox 360 Wireless Reciever
USB Logitech G15 Keyboard
USB Microsoft Intellimouse Optical
I've read that some other suggestions are to reseat the CPU. somethign which I really don't want to attempt because I'll have to pull the motherboard to remove the heatsync from the CPU.
The RAM that I bought I think is the same exact model I already had in there, a 6GB kit (3x2GB) PC3 12800 1600MHz
Patriot Memory Viper Series. They have a blue heatsync on all the DIMMs
Ok, I tested each stick of RAM one at a time. One of the new sticks fails POST, the other 2 worked. If I put all 5 working sticks in, it shows me 10 GB, if I stick the bad DIMM in slot 6 it shows me 8 GB so I guess I must have had the bad DIMM in slot 4 the first time I installed them