I've never used memtest. i just installed 2GB new ram this morning and ran the test and it seems okay; everything passed. I just wanted someone that has used it before to take a look my log and let me know. To me the only thing that didnt seem right is that it was showing 826MB per chip instead of a gig..?: Memtest version 4.13 (32-bit) Copyright (C) 2004 Charles Cazabon Copyright (C) 2004, 2005 Tony Scaminaci (Macintosh port) Licensed under the GNU General Public License version 2 only NOTE: No command-line arguments have been specified Using defaults: test all available memory, 1 pass, no logfile MacOS X (Darwin) running in multiuser mode POSIX version 200112 Pagesize is 4096 Requested memory: 1653MB (1733767168 bytes) Available memory: 1653MB (1733767168 bytes) Allocated memory: 1653MB (1733767168 bytes) at local address 0x02008000 Attempting memory lock... locked successfully Creating test buffers... Buffer A: 826MB (866883584 bytes) at local address 0x02008000 Buffer B: 826MB (866883584 bytes) at local address 0x35ac1800 Running 1 test sequence... Test sequence 1 of 1: Stuck Address : ok Random Value : ok Compare XOR : ok Compare SUB : ok Compare MUL : ok Compare DIV : ok Compare OR : ok Compare AND : ok Sequential Increment: ok Solid Bits : ok Block Sequential : ok Checkerboard : ok Bit Spread : ok Bit Flip : ok Walking Ones : ok Walking Zeroes : ok All tests passed. logout [Process completed] thanks in advance!