I am running Win Xp Pro 32 bit on a custom machine. I pulled out my 2 1 GB of DDR2 800 Ram and added 2 2GB sticks of DDR2 800 Ram and the boot time as well as some programs seem to load slower. I have a 512mb video card and I think XP is using another .3 gb of ram because CPU-Z is showing 3.2, which was around what I expected it to show. Would putting in the Old ram help, or am I just being paranoid. Thanks and let me know if you need a DXDIAG.
In general the more the memory per module, the more is the latency of the ram, but this will not make the system very much slow, indeed a 0.5 % slow for the programs which can also run in the previous memory configuration very fine and will be much faster for the programs which need a lot of memory which was inadequate for the previous memory configuration
I think the problem with your system is the Operating System, Windows Xp 32 bit. Windows Xp 32 bit has a problem in handling 4Gb of memory
try to shift to a 64 bit Operating System or remove a 2 GB stick and replace with a 1 GB previous stick so that, you have a 3GB of memory