so that your situation is clear. It isn't at the moment.
For example, is the RAM you "bought" the same as the RAM you "used"?
What is "bigger"?
What are the "dated components"?
What is "this particular one"?
What is "a higher RAM set"?
What is "my 1600mhz"?
If the RAM you bought is incompatible with your motherboard, don't use it.
I have an Asus P7P55D-E LX motherboard with an Intel i5 chip. This motherboard calls for either DDR3 1066, 1333, 1600 MHz ram. I have bought Kingston HyperX Genesis(KHX1600C9D3K2/8GX). However my motherboard will not boot up off of this. The ram is good I have tested in another PC and it worked fine. Whilst doing some troubleshooting I put in ram from a friends PC and it had booted and ran fine. Allowing me to install windows 10 etc. Come to find out the ram I used was DDR3 2666 (F3-2666C11D-16GTXD). This ram is bigger than what my motherboard should have been able to run according to Asus specs. I do know these are dated components but are what I have and can’t afford to spend money on newer ones. So my question is how am I able to run such a higher ram set and should I just buy this particular one or how would I be able to make my 1600mhz work?
Mobo: Asus P7P55D-E LX
Processor: Intel P55 LGA 1156 Chip
GPU: Nvidia GTX 546 Ti
P.S. I am a newbie when it comes to computer parts and building, this being my first build. Any and all advice would be greatly appreciated.