RIG REBUILD
Ok, Update:
Miner_Ver: Phoenix Miner v5.8c
OS: Win10 x64 Pro
RAM 32GB DDR4
ASUS Mining Expert 19pcie (Really only 13pcie + 6 pcie used for p106's cards)
 
I have rebuilt my rig & gave everything a good clean during rebuild. New GPU Raisers ver009's And now latest ver10x (2021 editions) New GPU Thermal pads/New GPU Fans (Lot of work)..

I partially rebuilt my rig then discovered there was a fault *somewhere* which I was then forced to disassemble to locate the cause of offending malfunction.  Problem turned out to be a Faulty Memory Module of RAM, I may have caught /knocked during the break down/service..

Anyway, I decided that the current PSU(s) EVGA1600T2 + HX1200 was not sufficient to power my rig (As I'm adding x2 6900 XT Monday =)
 
So, I decided to go with a new Corsair AX1600i Paired with the EVGA 1600 T2 (Have the HX1200 as a redundant PSU maybe Ill run a raiser from it.. Will see how we go regards power draw)

This addition of AX1600i should give me more headroom and not over burden the PSU's
 
I'm still testing but I should be able to get at least one of the 6900XT's in and *If required* use the old HX1200 as the Third PSU for the rig to keep my power profile all within specs.

Hopefully, the power draws will all be balanced over the rig's PSU's and  running within the optimal spec for each of the PSU Units to hit the 94% Titanium 80Plus Ratings (or as close as possible)

Each Raiser is connected to 6-pin direct to PSU (No 6Pin - SATA Connections Just asking for trouble)
Some of the larger 8-Pin ATX connections which uses the thicker 16AWG I have Spit to power 2 raisers. ~150w max draw 75w on each raiser (Well within specs)

x10 RX580 8GB (185 TDP + 75w Raisers = 260w)
System @ Idle ~240w-260w peek boot draw reading were off the wall.
Im still digging in to locate the detailed specs from Sapphire for the x6900XT's to see their TDP 300w *I think* (Based on 1x 6-pin + 2x 8-pin) connections.

(Amps X Volts = Watts)  (+20% (520w) Headroom.)

This is what I really wanted to share with you guys.. These hashrates from some of the RX580's 34.2MH/s @ ~92w Stable!!!!  (x4 GPU rig pulling only 620w from the wall !)
I Think this can be improved too..

Feel free to take a Look at screenshot.
RX580 x4 Stable @ 34.2MH/s - Update: Now ~17hrs into this run Stable!.

https://imgur.com/rZxc1ht
[img=https://imgur.com/rZxc1ht]https://imgur.com/rZxc1ht[/img]

RFC
===

Request for Comments regarding running the X2 RX 6900 XT SE OC on the same system as the x580's

I don't know what I should do regarding modding the BIOS'es *Yet* as I had done with my Polaris v20 cards.
- Maybe If I just tune my rig .config using stock BIOS(es) first to get them running stable alongside the RX580's THEN look at Bios/Memory modifying, et al. .

Regarding Phoenix Miner v5.9c<== The Release Candidate I did run this prios to rebuilding this rig and it gave me shit BUT I cant 100% confirm if it was due to My broken rig or Buggy Beta version..
If anybody can give me some suggestions regarding this keeping in mind that i want to if at all possible have the RX580's and 6900XT's running from the same rig.
- Maybe run 2 separate instances of Phoenix Miner (One for the 580's one for the 6900XT's..)

Thanks in advance All..
Feedback / suggestions welcomed