Ram issue?

Thuggins2086

Acer Aspire 5742Z-4512

Model #: PEW71

OS: Windows 8

 

Problem: Bought this laptop used with 3 GB of DDR3. Decided to upgrade to the maximum of 8 GB of RAM. I ran CPU-Z to double check the memory type and speed. I logged into Newegg and order my memory. Once I received the memory modules, I installed them, and tried to boot the laptop up. Got to Windows boot logo and it started a reboot loop. Tried all combinations of known good modules with one of each of the new modules. One of the new modules refused to work. I returned it and received another module. That modules also did not want to work. So, my question is this:

 

What IS the maximum supported memory for this laptop? Why can I go above 6 GB of RAM?

 

P.S. Yes, I have a 64-bit processor AND OS. Same thing happens when trying to boot from a CD, USB, Media Card reader, or Ubuntu.

Alan-London

From experience gained over many years I can tell you not all RAM (with compatible specs) works in all machines.
Even architecture can make the difference. The Acer parts are both 256x8. While the stated CAS of both matches, do the other timings?
While possibly not the issue here, physical tolerances in socket and RAM PCB can also be problematic causing poor connectivity.
The service guide also covers a number of machines having differing CPUs so it may be worthwhile checking that yours uses one that can support 8GB of RAM.