I have a Gigabyte GA-M56S-S3 Motherboard, currently with 2.00 GB Dual-Channel DDR2 @ 376MHz (5-6-6-18) memory installed.
I have a near new DDR2 memory module (ValueRAM 2GB 800MHz DDR2 Non-ECC CL6 DIMM) spare.. Can these two memory modules co-exist and work with this board? Both are DDR2 but I note the difference in speed?
If they can coexist you will probably find they are both running at the slower speed. If you can't find what speed the board supports, then I recommend first testing with only the fast memory and check in the BIOS to see what RAM speed its detected before booting through to windows. Normally best to have all DIMMS at same speed...
hmm 376MHz is an odd speed to be running at but saying that most higher speed modules will quite happily run at slower speeds
your best bet is try it and see if it seems to run ok then use something like memtestx86 that'll be able to tell you whether or not the modules will coexist together happily or are getting errors happening