I'm averaging about 2-3 kernel panic "crashes" daily. I took my MP to the local Apple Store. They ran all of their tests and could not find a thing wrong with it. I've purchased Tech Tool Pro. The TTP diagnostics have come up with nothing. I use machine at work primarily for video editing/compression/authoring. The kernel panic(s) seem to occur when I'm outputting or compressing video files from Final Cut or Sorenson Squeeze. Here are some of my basic machine specs: 2 x Quad Intel Xeon 5 GB 667 MHz DDR@ FB-DIMM Video Card: ATI Radeon X1900 Serial ATA HDDs Here is one of the kernel panic reports (I have saved many more!): Wed Nov 5 07:33:18 2008 panic(cpu 1 caller 0x001A8CEC): Kernel trap at 0x00000000, type 14=page fault, registers: CR0: 0x80010033, CR2: 0x00000000, CR3: 0x00e81000, CR4: 0x00000660 EAX: 0x00000000, EBX: 0x07f25b74, ECX: 0x07f25b58, EDX: 0x0053b69c CR2: 0x00000000, EBP: 0x6f4f7028, ESI: 0x00000000, EDI: 0x6653d020 EFL: 0x00010006, EIP: 0x00000000, CS: 0x00000008, DS: 0x6f4f0010 Error code: 0x00000010 Backtrace (CPU 1), Frame : Return Address (4 potential args on stack) 0x6f4f6dd8 : 0x12b0fa (0x459234 0x6f4f6e0c 0x133243 0x0) 0x6f4f6e28 : 0x1a8cec (0x4627a0 0x0 0xe 0x461f50) 0x6f4f6f08 : 0x19eed5 (0x6f4f6f20 0x0 0x6f4f7028 0x0) 0x6f4f6f18 : 0x0 (0xe 0x48 0x70 0x10) 0x6f4f7028 : 0x136a1c (0x7f25b74 0x0 0x1 0x53d984) 0x6f4f7068 : 0x136ac0 (0x0 0x0 0x0 0x6b09f7d0) 0x6f4f7088 : 0x130a21 (0x0 0x0 0x6f4f70a8 0x1a236f) 0x6f4f70a8 : 0x38063f (0x7ec4010 0x0 0x6b09f7d0 0x0) 0x6f4f7108 : 0x3809f0 (0x0 0x0 0x0 0x7ec4010) 0x6f4f7148 : 0x1c7828 (0x6b09f7d0 0x7ec4010 0x11 0x465248) 0x6f4f7188 : 0x3168c7 (0x6b09f7d0 0xdbe7 0x0 0x2000) 0x6f4f71f8 : 0x34a5bc (0x80c5e20 0xdbe7 0x0 0x6f4f725c) 0x6f4f7218 : 0x34b41d (0x811d004 0xdbe7 0x0 0x6f4f725c) 0x6f4f7298 : 0x348cfc (0x811d004 0x812c420 0x6f4f72d4 0x6f4f7370) 0x6f4f7398 : 0x31b572 (0x8129ee0 0x812c404 0x6f4f74dc 0x6f4f74ee) 0x6f4f7508 : 0x31d127 (0xdbbf 0x0 0x6f4f76a8 0x6f4f75e0) Backtrace continues... BSD process name corresponding to current thread: launchctl Mac OS version: 9F33 Kernel version: Darwin Kernel Version 9.5.0: Wed Sep 3 11:29:43 PDT 2008; root:xnu-1228.7.58~1/RELEASE_I386 System model name: MacPro2,1 (Mac-F4208DA9) Any help or suggestions would be greatly appreciated. I'm losing many work hours to these system crashes. Thanks in advance.