Just received my order of 1 512M DDR from Crucial to max out the RAM on my 8kha+. No matter what slot I put the DDR in, it's not recognized. The RAM I was sent after ordering thru their memory configurator is 512M DDR PC2700 CL2.5. The 2 sticks already (working) in the system are each 512M DDR 400 CL3. Do I have a bad memory module is it not compatible with what's already in the system or not compatible with the motherboard? Any help appreciated. Thanks!