• Now's your chance win big! Join our community and get entered to win a RTX 2060 GPU, plus more! Join here.

    Pi Cast Episode 3 streams live on Tuesday, August 4th at 2:30 pm ET (7:30 PM BST). Watch live right here!

    Catch Scharon on the Tom's Hardware Show live on Thursday, August 6th at 2:00 pm ET (7:00 PM BST). Click here!

Question My Motherboard only recognizes 1 RAM slot


Jan 11, 2017

I have been playing games on my PC for about a year when I wanted to upgrade my 10gb RAM to 16GB. I bought the PC off of someone, so the 4 slots were filled with 2gb-4gb-4gb-2gb RAM sticks. I took them out and replace them with 2x 8gb sticks (second and fourth slot). When booting up my PC, I saw my PC only recognized the second slot and not the fourth. When putting the 4 old RAM sticks in, I got the error code 55. After doing some testing, I concluded that my PC only recognizes the second slot when there's RAM placed in there. Last week I ordered a 2x4gb Kit (thought it was 2x8gb, but the seller had it wrong), to test if it has to do with my old 2x8gb sticks not being a kit, and the same thing happened; the PC only recognized the second slot.
I find this weird, considering it worked perfectly when running with the 10gb RAM setup. The RAM sticks do work, it just has something to do with the motherboard I guess?

My specs:
Motherboard: AsRock Z77 Extreme 4
RAM: https://www.amazon.com/G-SKILL-Ripjaws-240-Pin-PC3-10666-F3-10666CL9D-8GBRL/dp/B002X578GE