MB only reading 1 stick of RAM, doesnt matter the DIMM slot or capacity of the stick

Jaymes_Harris

Reputable
Feb 8, 2016
1
0
4,510
Hi Guys, This has been bugging me all day.

recently i realised that 1 of my 4gb Corsair Vengeance seems to be reading and i just assumed he other had died. so i decided to buy a pair of 8gb Cucial Ballistix Sport, as a photographer the extra memory helps a lot.

so i took out the old ram and installed the new pair... only problem is the MB only seems to read 1 stick. naturally i changed dimm slots, but it stilled continued. i took both out and went through all 4 dimm slots individually with both sticks and they worked individually every go . tried the same with the old ram and the same result, i then mixed the old 4gb sticks with the 8gb and the 8gb sticks was the only one the bios found.

so to summarise every DIMM slot works by itself but as soon as i install 2 sticks the largest capacity stick is the only one the mb detects.

my motherboard is a Asus P8Z77-V LX (with the latest bios) and my CPU s an i5 3570k

any help would be great :)
 
Solution
Clear CMOS.

If still have problems, then -

check that the CPU is mounted evenly. Loosen CPU cooler screws, and shift/move cooler if necessary. Tighten cooler screws with same pressure to ensure even pressure is applied to the CPU. Uneven pressure on the CPU may make it lose contact with some pins due to CPU being slightly tilted due to uneven pressure. The loss of contact with some pins can cause memory access problems.

If still have problems, remove CPU and check for damaged/missing pins and dirt/debris. Check both the socket and the CPU carefully.
Clear CMOS.

If still have problems, then -

check that the CPU is mounted evenly. Loosen CPU cooler screws, and shift/move cooler if necessary. Tighten cooler screws with same pressure to ensure even pressure is applied to the CPU. Uneven pressure on the CPU may make it lose contact with some pins due to CPU being slightly tilted due to uneven pressure. The loss of contact with some pins can cause memory access problems.

If still have problems, remove CPU and check for damaged/missing pins and dirt/debris. Check both the socket and the CPU carefully.
 
Solution