Failed ram or what? Help please

[elmachovena]

Hello everyone. I just bought a new ram memory Kingston hyperx fury 8gb 1866mhz ddr3 in order to expand my capacity to 16gb( I had already installed another Kingston hyperx fury 8gb 1866mhz ddr3 which works perfectly ALONE). The problem is that when I install the new one, my computer freezes after few minutes and I have no option but reboot. The older one works perfectly alone, when I install them together they freezes and the new one alone also freezes. I don't know what to do... Another problem is that my motherboard has 4 slots, 2 blue(1/3) and 2 black (2/4) when I try blue slots single or both cards together my OS starts normally but it freezes in case of having the new memory installed. When a try slots 2/4 it doesn't matter which memory I install, just a black screen appears and say : select proper boot device... And all that. I tried the card in another pc and it works without apparent problems.. Help please! My pc specifications: amd fx 8350 vishera black edition
Kingston hyperx fury 8gb 1866mhz ddr3 ( works ok)
Kingston hyperx fury 8gb 1866mhz ddr3( I don't know if it works)
Amd radeon rx 470 8gb Sapphire nitro
Seagate 1tb
Wd blue 2tb
Sentey powerx 750w
Asus m5a78l-m/usb3
Windows 7 service pack 1 64bit

 

[elmachovena]

I have just checked using memtest 64 (both memories installed) it freezes after 36 seconds and 0 errors... Looks like it just freezes when requirements are high... I don't know, maybe I should install Windows 10? Please heeelp