ddr3 1600mhz not working in place of pc3-8500

[kodelord]

hello

i have a vaio vpcec35fg that currently has 2x 2gb (=4gb) pc3 8500 (777) ram sticks.

i replaced them with 2x 4gb 1600 mhz ddr3 sodimms.

the pc boots up but windows gives a Blue screen. similarly trying to run ubuntu pc reboots halfway thru the ubuntu startup process.

i have tried other rams of the same new spec but i get the same issue. The original speed ram is very expensive (2x the new one) .. so what am i doing wrong? shouldnt the ram be theoretically backwards compatible?

 

[Calvin7]

It isn't listed as supporting 1600MHz memory. It uses DDR3 1066 (PC3 8500) memory.
http://www.sony.co.in/support/product/vpcec35fg
The Intel Core i5 Mobile i5-560M uses 1066MHz memory.