I just replaced my 4 gigs of Patriot Viper (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) with 8 gigs (4 x 2GB) of G.SKILL PI Black 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) on a EVGA 132-CK-NF78-TR LGA 775 NVIDIA nForce 780i SLI ATX Intel Motherboard which according to specs, holds 8 gigs. I am currently running Windows XP.
The reasons I did this are:
1. While running a memory-intensive flight sim, I was getting errors that led me to believe that some of my memory addresses were bad.
2. My system indicated that it was only recognizing 2.75 of 4 gigs which also led me to believe the RAM was going bad.
3. I wanted better performance.
Unfortunately, after the replacements arrived, my system still indicates that it only recognizes 2.75 gigs. Please don't tell me that I need a new motherboard because the slots have gone bad.