The 080121-5953-01.dmp is a classic IRQL_NOT_LESS_OR_EQUAL which means that an attempt was made to access memory that was paged out (or improperly allocated or the pointer was bad) whilst running at an elevated IRQL. This is almost always a third party driver or user code problem.
The trap frame shows that the problem was caused by a user mode buffer (or by the pointer to that buffer) which was invalid (paged out or not allocated).
The stack trace shows that the problem happened whilst the system was hibernating prior to a shutdown. We can see the ACPI call to transition the CPU power and the calls to the hibernation functions. The bug check seems to happen in a write operation during the creation of the hibernation file itself.
The active thread also shows a driver call error for the hiber_storahci.sys driver, this is the driver use by hibernation to write to the ACHI drive (SSD or HDD).
Code:
fffff901`9b8b6cb8 fffff807`374e674bUnable to load image hiber_storahci.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for hiber_storahci.sys
hiber_storahci+0x674b
The 080121-5968-01.dmp is also a classic IRQL_NOT_LESS_OR_EQUAL stop code.
The trap frame here shows that the problem was caused by a kernel mode buffer (or by the pointer to that buffer) which was invalid (paged out or not allocated).
The stack trace also shows that this problem happened during hibernation at shutdown. Here the bug check occurred whilst compressing the buffer to be written to the hibernation file.
The active thread also shows a similar error for the hiber_storachi.sys driver....
Code:
fffffa83`d52f6ef8 fffff800`8fad6585Unable to load image hiber_storahci.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for hiber_storahci.sys
hiber_storahci+0x6585
The 080321-6562-01.dmp is almost identical to the others, it's a classic IRQL_NOT_LESS_OR_EQUAL stop code.
Again the trap frame shows that the problem was caused by a kernel mode buffer (or by the pointer to that buffer) which was invalid (paged out or not allocated).
The stack trace also shows that this problem happened during hibernation at shutdown. Again the bug check occurred whilst compressing the buffer to be written to the hibernation file.
The active thread also shows a similar error for the hiber_storachi.sys driver....
Code:
ffffbd05`a24f6ef8 fffff804`80e36585Unable to load image hiber_storahci.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for hiber_storahci.sys
hiber_storahci+0x6585
The common denominators here (apart from them all happening during hibernation) are RAM and the drive containing the hibernation file (hiberfil.sys). A chkdsk /f on the drive would be a good idea, but it seems to me that all three of these dumps are pointing at RAM again.
It could of course be the CPU as you think, it's always wise to suspect whatever you changed last, but RAM is a much more likely cause. Is your RAM overclocked at all? Is the CPU overclocked at all? If either or both are overclocked then I would reduce everything to stock frequencies to see whether it's stable then.
If you have more than one RAM card then run with just one card at a time for a while to see whether one of the cards is flaky. Memtest is a great tool but it can only prove that the RAM is bad, it can never prove that it's good.