Windows XP and RAM 3.5GB+
I've installed 6 Gb of RAM onto my computer running Win7.
For some reason most programs (Everest in Memory tab says 3327mb, Task Manager says that too) report that 4 Gb of RAM is installed. I also did Wmi query against Win32_ComputerSystem and the field TotalPhysicalMemory yields
However SPD tab in Everest sees both banks of memory and identifies tham correctly:
DIMM1: GoodRAM GR1333D364L9/2G
DIMM2: Kingston 9905471-009.A00LF