GPU Double wide riser configuration - HP Proliant DL380p - Gen8 - 8SFF

Hello,
We would like topurchase some serverHPProliantDL380p-Gen8-8SFF

On the serverwe need to install:
1)GPU-NVIDIAGridK1 -PCIe 3.0× 16-130W(alreadypurchasedfromthird parties)
1) HPBrocadeFibre ChannelHost Bus Adapters-AP770B-PCIe 2.0-8x

Question 1:
We canuse these twocardstogether on theprimaryriser, sowithout using2 processors?

Question 2:
We have to use"HPDL380pGen8Double WideSlot1RiserCageKit"(752803-B21)
Or we can usethedefaultriser?

Question 3:
The "Double WideSlot1RiserCageKit" (752803-B21) also supportssingleWideGPU?

Thanks in advance

Cristiano Fantinati

IT - Administrator - IPSIA F.lli Taddia