OK I ran memtest on the memory... wow.
heres the terminal report:
Mac OS X 10.7.3 (11D50b) running in multiuser mode
Memory Page Size: 4096
System has 2 Intel core(s) with SSE
Requested memory: 6581MB (6900953088 bytes)
Available memory: 6581MB (6900953088 bytes)
Allocated memory: 6581MB (6900953088 bytes) at local address 0x0000000101000000
Attempting memory lock... locked successfully
Partitioning memory into 2 comparison buffers...
Buffer A: 3290MB (3450476544 bytes) starts at local address 0x0000000101000000
Buffer B: 3290MB (3450476544 bytes) starts at local address 0x00000001ceaa1800
Running 2 test sequences... (CTRL-C to quit)
Test sequence 1 of 2:
Running tests on full 6581MB region...
Stuck Address : testing 1 of 16
FAILURE! Data mismatch at local address 0x00000002612ac000
Actual Data: 0x00000000612ac000
Linear PRN : testing 1 of 16
FAILURE! Data mismatch at local address 0x00000002612ac000
Expected Data: 0x73eeed43525953b4, Actual Data: 0x73eeed40525953b4
Running comparison tests using 3290MB buffers...
Random Value :
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0x7b9f4794be8fd5c9, BUFB Data: 0x7b9f4700be8fd5c9
Compare XOR :
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0x6e601e04d536a38d, BUFB Data: 0x6e601e80d536a38d
Compare SUB :
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0xaf647d6bc1d8b31e, BUFB Data: 0xaf647d20c1d8b31e
Compare MUL :
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0xe65e286467fbcfda, BUFB Data: 0x16e97f6067fbcfda
Compare DIV :
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0x0000000000000001, BUFB Data: 0x0000000000000000
Compare OR :
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0x67ff878463be7c1b, BUFB Data: 0x67ff870063be7c1b
Compare AND :
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0x45fe02806336180b, BUFB Data: 0x45fe02006336180b
Sequential Increment:
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0x5ffe474ef10fb133, BUFB Data: 0x5ffe4740f10fb133
Solid Bits : testing 1 of 64
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0xffffffffffffffff, BUFB Data: 0xffffffe0ffffffff
Block Sequential : testing 1 of 256
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0x0000000000000000, BUFB Data: 0x0000004000000000
Checkerboard : testing 1 of 64
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0x5555555555555555, BUFB Data: 0x5555554055555555
Bit Spread : testing 1 of 128
FAILURE! Data mismatch at local BUFA address 0x000000019380a830, BUFB address 0x00000002612ac030
BUFA Data: 0x0000000000000005, BUFB Data: 0x0000008000000005
Bit Flip : testing 1 of 512
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0xfffffffffffffffe, BUFB Data: 0xffffffe0fffffffe
Walking Ones : testing 1 of 128
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0xfffffffffffffffe, BUFB Data: 0xffffffe1fffffffe
Walking Zeroes : testing 1 of 128
FAILURE! Data mismatch at local BUFA address 0x000000019380a800, BUFB address 0x00000002612ac000
BUFA Data: 0x0000000000000001, BUFB Data: 0x0000004000000001
pretty well worthless memory huh? CORSAIR from newegg as well...