It took all of two minutes to find this link: http://www.micron.com/parts/dram/mobile-ddr3-sdram/edf8164a3pk-gd-f?matpart={7D648E18-DBF9-4303-A25D-F57B9E3E2DAB}#faqsIFixit didn't reveal 2GB of ram.
We assume it is 2GB.
The important part, the root defines the basic part. The suffixes which do vary indicate the configuration. Effectively this verifies the correctness of the reports.We don't know what part number "Elpida (Micron Technology) F8164A3MD" is, and neither does ifixit. They told us the part number and said there are 2 of them.
There is no listing anywhere for this part, even in Micron's catalog, and so the only thing we can go by are the benchmark software to tell us
Nope, two minutes of searching would have relieved you of this terrible burden of distrust.