HELP with BSOD

Need help analyzing BSOD. It happens at random.
My hardware and OS information:
HP Pavilion Elite e9150t CTO Desktop PC
I7 @ 2.67GHz
RAM 8GB
System 64-bit Windows 7 Home Premium upgraded from Windows Vista early last year.

Defects in a hardware device is the cause, this is indicated by Bugcheck 0x124. The most probable causes are defective RAM or GPU
Stop 0x124 - what it means and what to try
RAM - Test with Memtest86+

Code:

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

BugCheck 124, {0, fffffa8007d368f8, 0, 0}

Probably caused by : hardware


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: fffffa8007d368f8, Address of the WHEA_ERROR_RECORD structure.
Arg3: 0000000000000000, High order 32-bits of the MCi_STATUS value.
Arg4: 0000000000000000, Low order 32-bits of the MCi_STATUS value.

Debugging Details:
------------------


BUGCHECK_STR:  0x124_GenuineIntel

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT

PROCESS_NAME:  System

CURRENT_IRQL:  0

STACK_TEXT:  
fffff880`0357e6f0 fffff800`034c8d29 : fffffa80`07d368d0 fffffa80`06d4c040 00000000`00000004 00000000`00000000 : nt!WheapCreateLiveTriageDump+0x6c
fffff880`0357ec10 fffff800`033a8217 : fffffa80`07d368d0 fffff800`03422658 fffffa80`06d4c040 00000000`00000000 : nt!WheapCreateTriageDumpFromPreviousSession+0x49
fffff880`0357ec40 fffff800`0330f865 : fffff800`034843a0 00000000`00000001 fffffa80`07d40830 fffffa80`06d4c040 : nt!WheapProcessWorkQueueItem+0x57
fffff880`0357ec80 fffff800`0328fa21 : fffff880`011e1e00 fffff800`0330f840 fffffa80`06d4c000 00000000`00000000 : nt!WheapWorkQueueWorkerRoutine+0x25
fffff880`0357ecb0 fffff800`03522cce : 00000000`00000000 fffffa80`06d4c040 00000000`00000080 fffffa80`06d18040 : nt!ExpWorkerThread+0x111
fffff880`0357ed40 fffff800`03276fe6 : fffff880`03371180 fffffa80`06d4c040 fffff880`0337c0c0 00000000`00000000 : nt!PspSystemThreadStartup+0x5a
fffff880`0357ed80 00000000`00000000 : fffff880`0357f000 fffff880`03579000 fffff880`030f1540 00000000`00000000 : nt!KxStartSystemThread+0x16


STACK_COMMAND:  kb

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: hardware

IMAGE_NAME:  hardware

DEBUG_FLR_IMAGE_TIMESTAMP:  0

FAILURE_BUCKET_ID:  X64_0x124_GenuineIntel_PROCESSOR_MAE_PRV

BUCKET_ID:  X64_0x124_GenuineIntel_PROCESSOR_MAE_PRV

Followup: MachineOwner
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Completed RAM - Test with Memtest86+ it ran overnight no errors.
Reviewing the info on Stop 0x124 - what it means and what to try
Will post with what I find.
Thanks