No boot with 3rd RAM stick after upgrade?

[StatikSA]

Recently upgraded my PC, i have 3x 4GB DDR4 Kingston sticks (all same specs). All worked on my previous CPU and showed 12GB in WIndows


Now that i put in the new CPU it is not booting if i put the 3rd stick leaving me with only 8GB, it will only boot with 2 sticks.

Any idea? Thanks

I tried 1 by 1 and different slots, reseating etc no luck.

[Guest]

what was your previous cpu, current cpu and motherboard? 

[boggy77]

it's generally not a great idea to run 3 sticks

[StatikSA]

All are Kingston with only one module differing in model name. Its 2 KVR24N17S6/4 And one KVR24N17S8/4 

 

It used to work before on the same motherboard i am using now with a less powerful cpu I had.

 

I went from a i3 8100 to a i9 9900.

On the ASUS B360F STRIX

 

The 12gb worked fine on this same mobo with the i3 so why is not working with the i9?

Just 8 working now though on the new cpu.

[StatikSA]

I do get that 3 is not good but howcome it worked with my i3 and not the new i9?

[Guest]

Make sure you're using BIOS version 1703 and that the two S6/4 sticks are in the DIMM_A2 and DIMM_B2 slots. The S8/4 stick can be in either A1 or B1.

[StatikSA]

Thanks guys tried all looks like when i was storing the motherboard while waiting for a new CPU it might of bent a pin, so will have to fix that