Question 16GB 2x8GB DDR4 faulty AIDA64 Stress Test Fail

Mar 27, 2019
Ive just ran a stress test with AIDA64 with both 8GB sticks in and within 20 seconds i get Hardware Fail but if i run the stress test one stick at a time the stress test goes on for over 3 minutes no faults

is this faulty memory or am i doing something wrong LOL

this was what started me to test for faults

Problem is games seem to start to install then at random times during installation then i get a error saying An error occurred whilst trying to copy a file the source file is corrupted,
I can install the same files on other computer with no problem installs fine with no error , Also when trying to download Destiny 2 at random times during the download it will just come up as failed and to try again, i get this multiple times within the 100Gb download, Fournite is the same starts to download gets so far and says failed then wants me to restart the download
Issue seems to be only on certain games as i've downloaded and run Anthem and battlefield 5 without any problems at all alos cant un rar things i keep getting errors

i have swapped out everything but CPU (i5 8400) and Memory (16Gb 2x8GB corsair vengeance LPX 2666mhz) so i'm guessing one is at fault

i ran Prime95 and within seconds i get "Fatal error rounding was 0.5" error

any one have any ideas on why i would be getting that error?

also dont know if this is a thing but under Windows task manager my CPU and Memory is showing as

Base Speed : 2.81Ghz
Speed : 2667MHz

CPU: i5 8400
Motherboard: MSI B360M-PRO-VH : BIO 7B53v17
Ram: 16Gb 2x8GB corsair vengeance LPX 2666mhz
GPU: GTX 1660 TI 6GB
PSU: EVGA Gold Hybrid 650 GQ
Chassis: CoolerMaster MasterBox Q300L
OS: Windows 10