With 64 bit windows 7 HP the limit is 16GB.
Really??? Didn't know that. Surely the limit with 64bit is something crazy like TB level, or have MS implemented artificial software limits which are raised as a 'feature' of pro/ultimate/etc editions?
Unless you're talking about XP (I don't believe you specified), to which I would say stick with 32bit.
The situation may have drastically improved but when I last used it it was hideously crashy, though this was probably down to woeful driver support.
192 GB is purely a Win7 OS limit for 64 bit as stated
the memory limit that 64bit could address is in the 8TB area - way beyond anything that need be a worry or concern to desktop/home users![]()