   Troubles with Memory Installation
  Okay, I have a Chaintech S1689 Motherboard. A few weeks ago I had a single stick of OCZ PC3200 RAM installed in the motherboard. I ordered another stick of 512 and things were gravy. The problem I'm having now is that I bought well, another stick of 512 and now it won't boot. Any pair out of the three will work, but it justs beeps when I put all three sticks into the machine. I figured that since it has four slots, I'd be able to put three sticks in there, but apparently it doesn't like it. What gives?   
  From my limited hardware knowledge, my guess is that the motherboard needs to use dual channel to use all 4 sticks.That mean you need one or two pairs of matching memory sticks for it to work.   ;  Check your motherboard manual. Chances are it has rules about how much single and double sided ram you can put in at once. Motherboards and ram are the most finniky pieces of equipment in the entire computer and whilst things have gotten better recently they're still a pain in the arse. If you want post up your motherboard type and I'll look it up and see if I can help.   ;  As another bit of info, when I put two sticks into slots 1 and 2 it runs then dual channel and when I put them in slots 3 and 4 they run in single channel mode. The manual for the board says something about "Due to CPU limitations, using DDR400 RAM in configurations 1/3, 1/2/3, and 1/2/3/4 is not recommended".My board: S1689;  I've had problems mixing different brands of memory even on a single channel motherboard. I had two 256 MB sticks and 2 512MB. Various combinations would work together but I could never get it to work with all four. RAM is quite finicky.   ;  All of my RAM is exactly the same OCZ Premier PC3200 2.5-3-3-7 RAM. Maybe I'm crap out of luck and I'm just going to have to sell these sticks and buy two 1GB sticks.Then again, the manual did just say that 1/3 wasn't recommended and it turns out it just runs the memory single channel. Maybe that'd be what would happen if I added a fourth stick, that it would run it all single channel. That still doesn't say why the 1/2/3 combo causes it to not boot, though. Or could that not be booting because it is trying to run the first two sticks dual channel and the third single? I would need another stick to know for certain, but I would hate to buy one and then have it not work.   ;  Three sticks can't run in dual channel mode, and it sounds like the Chaintech has some weird bug (possibly the fault of the ULi chipset?) that prevents three sticks from running at all.   ;  maybe not the problem i'm thinking of, but try running the ram at a lower speed, 333 instead of 400.edit: make sure you have the most recent bios too!   ;  I tried downclocking the memory and I tried updating the BIOS, but still no good news. I'm thinking that my suspicions of it trying to run the first two sticks dual channel and the third stick single channel are probably true, which means I probably have to buy another stick to get it to work. While I don't mind having 2GB of RAM, that means dropping another $47 for a stick of the RAM.I was still interested in more of peoples' opinions.[Edited by - zer0wolf on December 4, 2005 9:38:24 PM];  Im assuming that you have done this allready, but all of my RAM problems are solved by reseating the RAM.   