my Techs assure me that DDR needs as little pressure applied as does the SDRAM on a FLAT surface, untill the tabs click up and lock your module into position.
Make sure that the notches of your module are orientated with those on the M/B`s slots.
There should be little more to do, these days you don`t even worry about voltage settings.
On the Edge of Extremity
Microsoft Registered OEM,DSP,MCP
Custom Building of PC`s.