For the benefit of other members who come across this, using DIMM.2 in RAID 0 with 2 SSD drives will not make much of a performance hit for the PCI-e 16_1 slot with a 16X graphics card. Although the PCI-e 16_1 slot will run at half speed of 8X, you would not really notice less performance in real world game playing etc. Only benchmarking will show a bit less score.