I just purchased a 1GB stick of 184-pin PC3200 DDR ram to add to a stick of 512MB 184-pin PC3200 DDR ram already in my computer. But when I boot up, my MoBo doesn't see/recognize it (still boots normally, just with only 512MB). I was under the impression that by simply being "184-pin PC3200 DDR ram" it was the same type of ram and compatible with my PC. But I found on the label it is "Hi-Density" PC3200 ram. That's a new one to me. Is there a difference or did I just get a dead stick of ram? I tried swapping the slots I put the ram in, and even tried it by itself. Nothing. And the only DRAM setting in my Pheonix BIOS is for Dram "timing". No help there. My setup: 2003 Soyo Dragon Ultra Platinum KT600 MoBo. Athlon 3200+ XP processor. 512MB PC3200 DDR ram. WinXP Pro SP2.