Hi Guys, This has got me entirely confused, I'll try to be brief. I've had a stable, modest OC for years, with my RAM running at their specified 1600 MHz. A year ago, my PC started having intermittent black screen issues and boot problems. I got the "detecting DRAM size" message over and over. I finally found that if I just lowered my SPD from 8 to 6 (thereby reducing my RAM from 1600 MHz to 1200 MHz but not affecting my CPU speed or anything else) I resolved the issue and it's been fine. http://forums.guru3d.com/showthread.php?t=403009 A week ago, it started happening again. I figured my RAM is deteriorating and I just need to lower it a bit. I couldn't lower the SPD so I just reduced the BLCK from 200 to 190. This worked. But the next day, I had to lower the BLCK to 180 or I'd get the "detecting DRAM size" message again and no boot. This went on until I was at 120 BLCK after several days. I tried interchanging the 3 sticks but nothing helped. I ordered new RAM, which will be arriving soon. But in the meantime, I noticed in CPUz that the number of channels was listed as DUAL. I am no expert, actually didn't really know for certain but was pretty sure this should be showing up as TRIPLE. I removed the furthest right stick (in slot #5 of six) and it booted up fine, in DUAL channel mode, at 1600 MHz. I then took the that stick and replaced one of the others (in slots #1 and #3) with it. Each pair worked fine at 1600 MHz. Finally, I just put all three sticks in, and miraculously, the PC is stable at it's original 1600 MHz, same as over a year ago before all this started happening. I checked CPUz and the memory is listed as TRIPLE channel now. What in the world is going on??!! I mean, I obviously tried swapping around the RAM sticks a year ago and that didn't help. (I didn't check what CPUz said for memory channels back then). So, I find it hard to believe that this was all simply due to the RAM not seated well. They were seated and reseated. Also, why then was dropping the SPD or the BLCK resulting in successful booting, and also why did I need to keep lowering it every day in order for it to boot? I just don't get it. And now I have $60 RAM coming in the mail... Please let me know what you think! Thanks! [EDIT]: it is not completely stable now. Sometimes, it boots up and runs fine with all three memory modules at 1600 MHz but then it might randomly freeze, and only if I remove a memory module (it doesn't matter which physical one, but of course I need to place the remaining pair in particular slots for dual channel memory) can I get it to boot.