Hi,
I'm owner of Toshiba Satellite L650-1KU, PSK1LE laptop for roughly 5 years.
I've decided to upgrade its RAM, because it became slower and slower each year when using browsers.

I've bought Kingston 4GB 1600MHz 1.5V DDR3 CL11 SODIMM KCP316SS8/4 RAM .
Physically it should be compatible with laptop, because originally used RAMs were 2+1GB :
1) 2GB DDR3 PC-8500 1066MHz MT16JSF25664HZ-1G1F1
2) 1GB DDR3 P000527760

in other words, everything, except maximum operating frequency, matches.
After I installed new RAM into slot, my laptop continue to work until "Windows starting..." screen. This text is visible for 0.5-1 second, and then blue screen appears.

I've updated BIOS and chipset driver to the latest version, available at toshiba driver download section. Same result;
Could you advice, how to launch this RAM with my laptop?

P.S.> I suspect, that if I could manually set RAM frequency in BIOS, this could solve the issue, however insydeH2O BIOS doesn't have such feature... - RAM field is inactive =( (except specific BIOS version, mentioned here - link).

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