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According to Intel I do have the correct drivers installed. As for the other SATA ports, since I have 2 logical drives, I need 4 ports which means I have to use at least 2 of the "regular" SATA connections since the Marvell SATA's are for data only, not RAID. Guess I can try spliting the logical drives - one on the 2 6GB ports and one on the regular ports. Though I have run the system with only one logical connected and get the same problem. Appreciate the look see and confirmation of what the data suggests. Guess my next approach is to RMA the mobo and try a different one. Any recommendations for a non-gamer type mobo?

Thanks. Here is the link - http://www.mediafire.com/?868l2biirbaby9t. Let me know if you need anything else. John...

Hi, Just finished getting a new system up - ASUS P8P67, Intel I-Core 5-2500K, 8GB (2x4GB) Corsair DDR3 -1600, EGA GeForce 9400 GT Video card, 650W Power Supply, Windows 7 Ultimate. Using 2 logical HDD's (each as a RAID 1) attached to the Intel SATA 3.0 ports and 2 DVD-RW's attached to the Intel SATA 6.0 ports. Marvell SATA 6.0 ports used for external ports. No Overclocking used. Basic applications (e.g. Office 2007, Quicken, Adobe, etc.) installed. System will run for a variable amount of time and then the "System" process takes over 25% of the CPU usage but brings the system operation to a halt. Periodically, cycles will be made available but not for very long - seconds at most. The typical timeframe is in the 20 min. range but I have run for 2 - 3 hours a couple of times. I did run an Xperf trace once and the big user was "iaStor.sys!?" but I'm not sure how to interpret that result. I also talked with ASUS and Intel (iaStor.sys is their module) but got nada from them - am I using the most current BIOS?(Yes!), do I have the most recent drivers? (Yes!), have I done a clean install? (Yes - multiple times). Well, then, it's not our problem (my paraphrase). So I'm hopeing someone else out there has run into this situation and can point me in a new direction. Thanks for any help on this very frustrating situation, John...