[SOLVED] DDR3L didn't work with 64bit windows

[Max@]

Hi, I have an old Toshiba laptop it's C660 Core i3 1st generation 2g ram 1333 1.5v
I wanted to increase the memory so I bought a new Kingstone 4GB DDR3 1.35v 1600 because I did not find 1.5v 1333 ram in the market
I read that DDR3L will work with DDR3 slots with no problem
I installed the RAM and the system read it and windows 7 read it 6GB RAM using only 3GB as known
I tried to install 64bit windows 10 but I wasn't able to do that with the new RAM installed, I removed it and the installation of Windows 10 successfully done, I tried to install the new RAM again but the windows showed a problem message and didn't start, and I failed to start windows 10 with the new ram installed with the old ram or even with new ram installed alone
I tried to install Windows 7 64bit and it was the same
Is there a way to setup a 64bit Windows in my case?

 

[USAFRet]

You need to use RAM that is actually compatible with your system.
If it does NOT state DDR3L, then that will not work.

 

[Max@]

But the system read it and Windows 7 32bit installed properly
Why I can't use it with 64bit windows?!

 

[bignastyid]

Try running memtest with the new ram installed.

 

[SamirD]

Try running memtest with the new ram installed.

Yes, do this first to make sure your memory subsystems doesn't show any errors.

And then you just may have an issue because there are two different module sizes. Ideally, you will need another exact same 4gb module to replace the 2gb one.