SATA raid

[Vu Pham]

Currently my home PC has a scsi raid controller with 4 scsi drives set
up in raid 0 mode in order to get the highest performance. ( yes,  I
have backed the system up pretty often ).

The problem is these scsi drives are pretty loudy at night when there is
no background noise.

I want to replace these scsi drives by two SATA drives with raid 0. 

For performance, is a built-in sata raid controller as good as an
pci-express one ? If the difference is 8 out of 10 it will be fine to
me, but if it is something 5 or 6 out of 10, then I would consider
looking for an external one.

My motherboard is Gigabyte GA-965P-DS3.

Any advice is greatly appreciated.

Thanks,

Vu