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RAID array performance drop when overclocking?

post #1 of 4
Thread Starter 
I am trying to overclock a Prescott 3.0 on a Asus p4p800 m/b. I recently installed a RAID 0 using the Ich5r southbridge controller. When benchmarking using Sandra with no overclocking, the raid array scores 99 MB/s.
When overclocking using the Asus AIBooster utility (may not be the best way but it's fast) I am pushing the fsb to 225. MEmory and cpu benchmark get a mild boost, but the raid array now scores at 85 MB/s.
Is it something to be expected or I am doing something wrong?

Thanks
post #2 of 4
Quote:
Originally Posted by Frank007
I am trying to overclock a Prescott 3.0 on a Asus p4p800 m/b. I recently installed a RAID 0 using the Ich5r southbridge controller. When benchmarking using Sandra with no overclocking, the raid array scores 99 MB/s.
When overclocking using the Asus AIBooster utility (may not be the best way but it's fast) I am pushing the fsb to 225. MEmory and cpu benchmark get a mild boost, but the raid array now scores at 85 MB/s.
Is it something to be expected or I am doing something wrong?

Thanks
Once you reach the 225 - 250 mark SATA hdds dont like the extra frequency. You need to set the array up on locked ports on the PCI frequency. Usually boards have two more slots which are controlled by a seperate RAID controller on the PCI frequence which is always locked or should be. The southbridge controls the IDE channel which sounds like you have them setup on. This cannot be locked on most boards. The extra FSB on an unlocked port will either not allow you to boot into windows or give you corrupt window files.

EDIT: Oh and WELCOME!
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Hard DriveOptical DriveCoolingOS
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by timsvpr
Once you reach the 225 - 250 mark SATA hdds dont like the extra frequency. You need to set the array up on locked ports on the PCI frequency. Usually boards have two more slots which are controlled by a seperate RAID controller on the PCI frequence which is always locked or should be. The southbridge controls the IDE channel which sounds like you have them setup on. This cannot be locked on most boards. The extra FSB on an unlocked port will either not allow you to boot into windows or give you corrupt window files.

EDIT: Oh and WELCOME!

That suck... using a pci raid controller, the raid array is only doing 60 MB/s. That kind of a huge difference.

Thanks
post #4 of 4
Go into your BIOS and lock the PCI frequency at 33.3 MHz (or very close). I don't believe AI Booster will allow you to do that. It should help your problem.

Also, welcome to the site.
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