BSOD @ Random Times error 0x00000124

Ever since I installed my new PSU and GPU into my system, I get blue screens by random it seems. Once was when I was watching a Youtube video, the other was me playing a game. I've included the dmps in the Zip file. Please look at the later ones, for example, the one from Sept. 21, or today in fact. The older ones can be used for reference too. Thanks in advance.

Please fill up the missing information of your system Specs, including the PSU info. It is very vital.
See your system specs and fill it up here.
Let us know the wattage of the PSU.

And, Stress test the Graphics Card using Furmark.
Video Card - Stress Test with Furmark

As you pointed these two as a line, so let us see these two at first. Will go for other things depending on the situation.
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Code:

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*                        Bugcheck Analysis                                    *
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Use !analyze -v to get detailed debugging information.

BugCheck 124, {0, fffffa8008db5028, b6674000, 135}

Probably caused by : AuthenticAMD

Followup: MachineOwner
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2: kd> !analyze -v
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*                        Bugcheck Analysis                                    *
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WHEA_UNCORRECTABLE_ERROR (124)
A fatal hardware error has occurred. Parameter 1 identifies the type of error
source that reported the error. Parameter 2 holds the address of the
WHEA_ERROR_RECORD structure that describes the error conditon.
Arguments:
Arg1: 0000000000000000, Machine Check Exception
Arg2: fffffa8008db5028, Address of the WHEA_ERROR_RECORD structure.
Arg3: 00000000b6674000, High order 32-bits of the MCi_STATUS value.
Arg4: 0000000000000135, Low order 32-bits of the MCi_STATUS value.

Debugging Details:
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BUGCHECK_STR:  0x124_AuthenticAMD

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  WIN7_DRIVER_FAULT

PROCESS_NAME:  chrome.exe

CURRENT_IRQL:  f

STACK_TEXT:  
fffff880`02f6ca88 fffff800`03e15a3b : 00000000`00000124 00000000`00000000 fffffa80`08db5028 00000000`b6674000 : nt!KeBugCheckEx
fffff880`02f6ca90 fffff800`039a9453 : 00000000`00000001 fffffa80`08db6d30 00000000`00000000 fffffa80`08db6d80 : hal!HalBugCheckSystem+0x1e3
fffff880`02f6cad0 fffff800`03e15700 : 00000000`00000728 fffffa80`08db6d30 fffff880`02f6ce30 00000000`00000000 : nt!WheaReportHwError+0x263
fffff880`02f6cb30 fffff800`03e15052 : fffffa80`08db6d30 fffff880`02f6ce30 fffffa80`08db6d30 00000000`00000000 : hal!HalpMcaReportError+0x4c
fffff880`02f6cc80 fffff800`03e08e8f : 00000000`07bd11fc 00000000`00000001 fffff880`02f6ceb0 00000000`00000000 : hal!HalpMceHandler+0x9e
fffff880`02f6ccc0 fffff800`0389146c : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : hal!HalHandleMcheck+0x47
fffff880`02f6ccf0 fffff800`038912d3 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KxMcheckAbort+0x6c
fffff880`02f6ce30 00000000`56b51fe5 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KiMcheckAbort+0x153
00000000`0ae5f398 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : 0x56b51fe5


STACK_COMMAND:  kb

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: AuthenticAMD

IMAGE_NAME:  AuthenticAMD

DEBUG_FLR_IMAGE_TIMESTAMP:  0

FAILURE_BUCKET_ID:  X64_0x124_AuthenticAMD_PROCESSOR_CACHE

BUCKET_ID:  X64_0x124_AuthenticAMD_PROCESSOR_CACHE

Followup: MachineOwner
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620 Watts are enough of a PSU there. And if furmark ran as you told it, the GPU is also should not be the issue.

Test your RAM modules for possible errors.
How to Test and Diagnose RAM Issues with Memtest86+
Run memtest for at least 8 passes, preferably overnight.

Stress test the CPU.
Hardware - Stress Test With Prime95

Is the computer hot? Report us the heat of the computer after a couple of hours of your normal usage. Upload a screenshot of the summery tab of Speccy.

Is it just after shutting down Prime95? If not, we have arrived at the decision.

If yes, give us another screenshot.... after a couple of hours normal usage.

Will suggest after seeing your reply to my question.