Asrock|970 extreme3 + f3-10666cl9d-8gbrl - bad ram?

[swcole9]

Stats:
Model of the motherboard: ASROCK|970 EXTREME3
BIOS ver: 1.6
Model of the memory: F3-10666CL9D-8GBRL
Model of the CPU: FX-4100 3.6G

Issues:
Boot issues
Stability issues (when boot is possible)
Not reading ALL RAM every time

My Diagnostics:
I will label the RAM sticks as X and Y

DIMM A1 B1 A2 B2

[X] [ ] [ ] [ ]

Result: OK (boots every time)
RAM: 4GB
________________________________________
DIMM A1 B1 A2 B2

[X] [Y] [ ] [ ]

Result: Boots 2 out of 3 times. Other times fans and lights come on with no boot
RAM: 8GB (3.98usable) or 8GB
Notes: if it reads all 8GB I will get a blue screen between 4 hours and 4 days.
blue screen will usually be followed by no boot.
after boot is successful, I will get the 8GB (3.98usable) issue.
________________________________________
DIMM A1 B1 A2 B2

[X] [ ] [Y] [ ]

Result: OK (boots every time)
RAM: 8GB (3.98usable) everytime
________________________________________
DIMM A1 B1 A2 B2

[Y] [ ] [ ] [ ]

Result: NG (will never boot)
RAM: N/A
________________________________________
DIMM A1 B1 A2 B2

[Y] [ ] [X] [ ]

Result: NG (will never boot)
RAM: N/A

NOTES:
I have tested all of this with default bios setup.
I have not changed any settings for OC.
I am a moderate PC user/builder, but very amateur OCer.

[swcole9]

Clarify

Just to clarify.
I'm guessing it is specifically a RAM issue.

I just would like to see if anyone has other ideas before I fill out a RMA.

[Tradesman]

Sounds like stick you mark as Y is marginal and/or going bad, I'd RMA or return to original vendor (depending who that was it might be faster