Weird Memory or Motherboard or memory controller problem

[robbo54321]

Hi I have an strange an erratic problem in that my memory fails memory tests at certain times.
I have a amd phenom II 1090T processor, msi motherboard with four memory slots, 4 DIMMs kingston value ram 1333Hhz 2G each.

I labeled the memory A B C D.

Monday:
A B C D in slots 1 2 3 4 fails memtest86+ at address 3167.6M

A B passes in any slots
A D passes in any slots
B D passes in any slots
A B C D pass when tested individually all at the default clock speed.

AC or BC or DC fails at address 3167.6 M no matter how they grouped, AC or CA in slots 1,2 or 3,4 address stays the same.

Tuesday:
Same as monday

Wednesday:
A B fails in any slots at address 128M
A D fails in any slots at address 128M
B D fails in any slots at address 128M
A B D all fail individual testing in any slot at address 128 M
C still passes all tests.

All tests were done on the same machine, I even tried reducing the memory clock to 800Mhz but makes no difference.

How can I determine if the memory or motherboard or memory controller or something else is faulty.
Any help would be appreciated.
Thanks
Rob Key

 

[robbo54321]

SOLVED:
I stripped my computer cleaned all the dust from memory slots, cpu slot etc. I bought one new kingston memory (I lost patience, I have been testing for a week) replaced the suspect and now my computer passes the memory tests will all 4 DIMMs in all 4 memory slots, 8Gigs of ram, slots 1,2 dual channel, slots 3,4 dual channel mode.

Interestingly the memory stick I replaced does work on its own but not with the other ones. Maybe the cleaning also helped.

Thanks for all your help
Rob

 

[ash256]

i had the same problem