hp & lenovo and #amd & #intel #memory bus nightmares

 

lost a few hours yesterday to some hp & lenovo and amd & intel memory bus nightmares started when i tried swapping DDR3 / PC3 / PC3L ram between an HP and two LENOVO notebooks

  • HP 255 G2 with AMD A4 memory bus FIXED at 1600Mhz
  • Lenovo T410 with Core i5 memory bus ONLY works at 1333Mhz
  • Lenovo Z50 with AMD FX7500 memory bus FIXED at 800Mhz

Basically the T41o refused to work with any of the other memory whereas i thought DDR3 ram was downwards compatible.

Actually just looking at my photos maybe PC3L is not downwards compatible with PC3 ?