System Recognizes Only 4gb of RAM

Yesterday I installed a new CPU cooler which overhung the 1st ram slot. Before this I had 2 4gb sticks installed in slots 1 and 3. I moved the sticks to 2 and 4 originally, but the system would not POST. I have now moved my sticks to 2 and 3, but the system recognizes only 4gb.

Motherboard: http://www.newegg.com/Product/Product.aspx?Item=N82E16813131995

Edit: I'm using 64 bit Windows 8.1
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  1. Do you mean the BIOS does not display the 8gb of memory, or is it windows?

    The memory should be installed in matching slots A2 and B2, the second and fourth dimm slots from the CPU socket by default. Have you tried clearing the BIOS? Some settings can get stored strangely and not detect/post without a hard bios clear sometimes, especially with new memory/moving memory to different dimm sockets or CPU installs.

    I've built a lot of systems lately with Z87 and H87 chipsets, I've been having tons of memory dimm issues from Asus and Gigabyte, RMAing ~20% of the boards...maybe a poorly tested/monitored batch made it's way out there.
    Otherwise, can you try installing one memory stick at a time in the A2 slot (second from CPU socket)? This is a good way to test for a flaky stick of memory.

    If you meant the 8gb wasn't detected in windows, somehow the memory remap in the BIOS may have been disabled, limiting the system to 4gb of memory.
  2. Assuming you are not using a 32 bit version of Windows, that would indicate the MB is defective to me. I would RMA it.
  3. Try clearing the CMOS and try in 2-4 (from CPU), if no joy, try loosing your CPU cooler then snugging it back up, not overly tight but snug, sometimes if you get a corner or side too tight, it can unbalance the CPU from full contact in the socket and DRAM issues often occur from it
  4. Yeah you should definitely try removing your CPU Cooler and putting it back on evenly because the same happened with my old PC then I tried to put the cooler on as even as possible and it fixed the problem
  5. ACG4MING said:
    Yeah you should definitely try removing your CPU Cooler and putting it back on evenly because the same happened with my old PC then I tried to put the cooler on as even as possible and it fixed the problem

    ____________________________________

    Like your Scorpion, see too many real ones out here in AZ ;)
  6. Try clearing the CMOS and try in 2-4 (from CPU), if no joy, try loosing your CPU cooler then snugging it back up, not overly tight but snug, sometimes if you get a corner or side too tight, it can unbalance the CPU from full contact in the socket and DRAM issues often occur from it]

    Will I end up having to completely remove the cooler and reapplying the thermal paste?
  7. No just loosen at the 4 corner attachment points, then snug back up
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