G73JH BSOD after SSD and ram upgrade

I upgraded my main harddrive to a Pro 850 SSD SATA3 running magician with rapid mode enabled (Laptop mainboard chipset is HM55 and supports up to SATA2) and at the same time added in 16gb (8gb x 2) by taking out two of the existing DDR3 dual channel 533MHz PC3-8500F ram.

Its an Asus G73JH running Win7 64b, it had 4 slots of 2gb each making 8gb ram in total before the upgrade so currently it has 2 x 8gb (new ram) and 2 x 2gb (existing ram).

HM55 chipset supports up to DRAM bus speed of 1066 MHz. The new 2 new sodimms are from Corsair – 16GB (2x8GB) at1333MHz DDR3. The existing 2gb sodimms has DRAM bus speed of 1066 MHz.

The ram are installed in the correct slots as its reporting as running in dual mode but from the day I installed it only 18gb (instead of 8gb+8gb+2gb+2gb = 20gb) implying 3 sodimm in total has been detected...but reporting dual channel mode.

The 4th sodimm slot is inaccessible currently so I can't take it out and see what happens but I am planning to do a full disassembly, upgrade the remaining 2 x 2gb sodimm to the same 2 x 8gb for a 32gb total, cleanup, re-paste of the CPU and GPU (since its at least 6 years old) and CPU upgrade when the new I7 920XM I ordered arrives.

It was running great since I did those upgrades a week or two ago but had at least 3 BSOD memory dump today. I repositioned the Sodimms thinking maybe it came loose but the BSOD happened once after I resit all the ram modules.

What could be wrong? Ram pair mismatch? Unlikely since I made sure to select ones closest to the old ones including clock speed. Could it be the 850 Pro with rapid mode enabled causing issues as it utilises memory for rapid mode? Could the new ram be faulty but it was working well for the last 1 to 2 weeks....

Also why does it only detect 3 ram modules instead of 4 (2 x 8gb, 2 x 2gb) but list it as running dual channel????

Memory info as below,

Type DDR3
Size 18432MBytes
Channels# Dual
DRAM Frequency 531.9MHz
CAS# Latency (CL) 7 clocks
RAS# to CAS# Delay (tRCD) 7 clocks
RAS# Precharge (tRP) 7 clocks
CycleTime(tRAS) 20 clocks
CommandRate(CR) 1T
The 2 new 8gb module is currently running as below,

JEDEC #1 457.1 MHz 6.0 6 6 17 22 1.500 V
JEDEC #2 533.3 MHz 7.0 7 7 20 26 1.500 V
JEDEC #3 666.7 MHz 9.0 9 9 24 33 1.500 V
The old existing 2gb detected is running as,

JEDEC #1 457.1 MHz 6.0 6 6 18 24 1.500 V
JEDEC #2 533.3 MHz 7.0 7 7 20 27 1.500 V
JEDEC #3 533.3 MHz 8.0 7 7 20 27 1.500 V
Problem signature:
ProblemEventName: BlueScreen
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 3081
Below is the error/memory dump info from Win7 64b.

Additional information about the problem:
BCCode: 50
BCP1: FFFFF8A017200000
BCP2: 0000000000000000
BCP3: FFFFF8000388CB2B
BCP4: 0000000000000002
OS Version: 6_1_7601
ServicePack: 1_0
Product: 256_1

 

Might be bad ram, wouldnt be the first of that Ive seen. I would see if removing all but one stick isolates issue or run memtest just to rule it out