Who to believe when seeking memory upgrades?

Question

This question is similar to the following: But asking the broad question of who to believe when seeking memory upgrades?

• What will happen if I install more RAM than specified in manual?
• What happens when more RAM is installed than the motherboard supports?

An MSI-7309 (K9N6SGM-v) Has (2) slots to fill. I am not exactly sure of the capacity.  Included below are links to conflicting specs.  I know that it can hold at least 2 Gigabytes. I would like to get 4GB in there. Without having to pay for return shipping or a restocking fee.

2GB

• MSI manual
• Newegg
• Memory X

4GB

• Tiger Direct
• Kingston

8GB

• MSI
• Crucial
• C-Net reviews

Answer 1

The motherboard manufacturer latest manual version.

Answer 2

Please see that the BIOS section specifically notes memory installs of 4GB located here: http://www.msi.com/product/mb/K9N6SGM-V---K9N6PGM-FI---K9N6PGM-F.html#/?div=BIOS

The manual was last updated in 2006, while the BIOS was last updated in 2008. I would assume then that the manual and newegg were never updated to reflect the newest memory availability.

Hope this helps.