My 5 year old pc has 256MB ram and I would like to buy new ram (because with WinXP it runs very slowly). But I don't know which ram to buy. --- 1) I've installed the program "Everest" and it gives the following information: Motherboard Name: Asus P4S266-VX If i click on SPD Everest shows: DDR SDRAM, PC2100 (133MHz) --- 2) I've also installed the program "CPU-Z" and it says the following: SPD (Slot #1) Module Size: 256 MBytes Max Bandwidth: PC2100 (133 MHz) Frequency 100MHz 133MHz --- 3) Then I went to the website "crucial.com" which says: # Maximum Memory Capacity: 1536MB # Currently Installed Memory: 256MB # Available Memory Slots: 1 # Number of Banks: 2 # Dual Channel Support: No # CPU Manufacturer: GenuineIntel # CPU Family: Intel(R) Pentium(R) 4 CPU 2.00GHz Modell 2, Stepping 4 # CPU Speed: 2018 MHz On the left hand side of the website it says: Currently installed memory: [256MB] [EMPTY] Each memory slot can hold DDR PC2700 with a maximum of 1GB per slot.* *Not to exceed manufacturer supported memory. --- What ram should I buy?