New
#11
I have already said you can run the two sas controller cards even tho they will run at different speeds if you so wish but there will be a speed diffference or mismatch which may affect and cause a bottleneck between communications between controllers where the faster is always going to be waiting for the slower card may give undesirable affects.
If you so wish to run like that then go ahead and do it the choice is yours at the end of the day and you are happy to do that no problem at all.
You originally said you wanted to x8 slots and the board you listed only had one slot capable of x8 which was a x16slot and a x4 and x1 slot so it did not match your requirement.
Both of those cards will work in the motherboard you orignally posted in your OP but as long as you are aware of the above with regards to communication speed.