motherboard? There are so many different types!? I'm trying to buy 1GB of ram for my computer but I'm finding it very confusing. The manual states the following:2 DDR DIMM slots: DDR1 and DDR2supports PC3200 (DDR400) / PC2700 (DDR333), max 2GB.Caution: Please check the table below for the memory support frequency and its corresponding CPU FSB frequency.-------------------------------------------CPU FSB Freq: Memory Support Frequency-------------------------------------------800: DDR333, DDR400533: DDR333, DDR400-------------------------------------------This motherboard doesn't support 128Mbit DRAM Cell DIMM (128MB/8 cells; 256MB/16 cells; 512MB/32 cells).I've been told that if my motherboard supports 'high density' ram. What does 'high density' ram mean and does my MB support it?I currently have 512MB in one slot. The motherboard is an Asrock P4Dual-915GL.