GPU upgrade on Dell PowerEdge R730xd

Hi,

I have just signed up with this forum to find out a bit more information about how PowerEdge series servers works.

A little description about my setup...

I have currently Dell PowerEdge R430, upgraded previously from PowerEdge 1950 as it didn't support virtualization. My R430 I have added 4x SAS drives in Raid 5 and originally bought with 4x SSD that runs in RAID 10. Then I bought NVIDIA Quadro T1000 8GB. I use SSD drives for my main system - FreeBSD that acts as hypervisor and router. SAS drives are for data such as backup files, iSCSI etc. I have few virtual machines and one of them is Windows 10 that is used on a daily basis for Steam Remote play (for admins who don't play games, it's a gaming platform ;))

After some time I have decided to upgrade R430 to R730xd that is on the way from eBay. Reason for upgrade is 2x PSU 1100W, there is a riser with 6+2PIN available for GPU, some more bays for SSD/SAS drives.

Now, my questions are:

-What is my best option for GPU for gaming? Do I have to go for RTX3070 with 1x8PIN or I can buy "splitter" and go for RTX3090? Keep in mind that I would like to keep my Quadro T1000 8GB for second Windows 10 virtual machine - maybe on the other side of the riser (I noticed risers are in the middle so you can install devices on each side).

-Any chance you can provide me with part numbers for Riser and cable that will 100% work with this setup?

-How is plug and play working in regarding to RAID controller? Can I just move my drives with system and data to new server and Perc will recognize everything or I have to swap RAID controller?

-I am not sure with RAID controllers and let's say I will buy additional SSD or SAS drives. Do I create new RAID volume or I can add additional drives to existing RAID5 without data loss?

Kind Regards,

Seb