More additions.
When trying to identify a High Density or Low Density module.
This can be very tough. Most the time the chips will be individually marked "16x8" or "32x4" etc.. A **x4 will guaranty a High Density module. A **x8 single sided module will also guaranty it's High Density. I have also seen a double sided module that was configured with 4 chips on each side. Each chip was 128x8. This was a 1GB High Density module.
When buying memory, if the seller does not know if the module is high density or low density, ask them if they guaranty it will work in your specific machine. Or ask them if it does not work if you can receive a full refund. If they do not, then do not buy. Like I've said before. It's better to spend more and get the correct product than spend a little and hope it works. If you want a module that is guaranty to work in your machine, buy from memory experts like
Crucial or
4AllMemory. They may charge a little more but the extra cost is better then the headache of getting the wrong memory.
As far as what your motherboard supports, read the manual.