I hope this is the right section to post this question.

I have Acer Veriton M460
Motherboard Acer EG31M

The problem I have is that I can't find what kind of RAM (DDR) my motherboard supports.
I already went to Acer.com downloaded manual which doesn't tell me anything about my
mother board. So far what I found is that Acer doesn't make their own motherboards.

I checked my current installed DDR on my EZ31M trough CPUZ: DDR2 1024Mbytes 667Mhz
I want to know what is the maximum memory my motherboard can support?
For example can it support 4gbs, 800Mhz and the rest information that you
can provide about the RAM.

Go to crucial.com and use their memory adviser tool.

HTH

Thank You!

you cann also use Everest to check it!