Yes, it should work. The total storage capacity would be 14GB, which fits within your available space.
Yes, it should work. The total storage capacity would be 14GB, which fits within your available space.
You have a 4GB RAM from Micron Technology and an 8GB from Kingston. Neither model came with a clear label indicating their specifications, but you found out via MemTest86 that the 8GB is a 10600 (1333). It's fine to combine both RAM sticks; they work well together. Setting the 8GB stick to 1600 in BIOS won't cause instability—it just changes the base address, which is normal.
Using mixing memory means testing if it functions correctly. If it does, it works; if not, it doesn't. It could work sometimes. When problems appear such as BSODs, file damage, and freezing, you should attempt fixes like adjusting frequency, timings, or voltage. Stability testing is possible, but it depends on how important your files are or how bothersome crashes would be.