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I have a alienware m11x r2 and I recently bought some new RAM for it. However after installing it, when windows boots up a "Windows fails to start" page appears. I am then giving the option to repair windows, but this just loads a screen that says "windows is loading files." This does nothing though, and it simply reboots. I'm thinking that I might have bought RAM that is not compatible with my system.

I bought 2 sticks of DDR3 1600 1.5V RAM and I believe that previous RAM was DDR3 800 1.35V. Is this the reasons it does not seem to take the new RAM? I thought I read that in the BIOS you can set values for RAM speed and voltage, but there are no such options - though the BIOS does recognize the new RAM.

Is there a way to make this new RAM compatible, or do I need to buy another kind? Thanks!

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You need to check your manual to verify how much memory your computer supports. You buying memory twice as fast and which requires 200 mv more then your other ram is a problem. I would just return the memory since you bought the wrong speed. – Ramhound May 11 '13 at 22:01
Test with one stick at a time. – Ƭᴇcʜιᴇ007 May 12 '13 at 6:04

Why are you trying to boot into an OS installation before you verify that the new RAM works correctly? That's a recipe for disaster and is likely to corrupt your OS installation. Do not make any attempt to load Windows until you know your hardware is reliable.

Test with memtest86+.

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