servxtrem

Slot 1 and 3 are at full 16x mode IF slot 2 and 4 are NOT populated.
Means max u can get is 2 slots 16x and 5 slots 8x if all populated...

Don't think you are right here.
 
The onboard PCIE 1 and 3 provide one x16 Gen3 link to CPU1 (Auto switch to x8 link if PCIE 2 and 4 are occupied); The onboard PCIE 5 and 7 provide one x16 Gen3 link to CPU2. These slots support VGA cards and various server class high performance add-on cards.
 
So you have slot 1-3-5-7 all at x16 as long as you don't use 2 and 4. Please correct me if I am wrong.
 

I found a new board.
 
The Intel Workstation Board W2600CR2
Same as  Intel Server Board S2600IP
(only some i/o ports change and audio is not present on server version)

 
Slot 1: PCIe Gen3 x16, connector from first processor.
Slot 2: PCIe Gen3 x8, connector from first processor.
Slot 3: PCIe Gen3 x16, connector from first processor.
Slot 4: PCIe Gen3 x8, connector from second processor.
Slot 5: PCIe Gen3 x16, connector from second processor.
Slot 6: PCIe Gen3 x8, connector, from second processor
Slot 7: PCIe Gen3 x16,connector, from second processor
Slot 8: PCIe Gen2 x4 electrical with x8 physical connector, from second processor

I see that.. something like the SR-X form factor?

In the technical specs of the W2600CR2 the power connectors look like standard 1 x ATX 24-pin, 2 x 8-pin EPS12V and 1 x 4-pin ATX 12V. I plan to get an Enermax Platimax 1500W for that board, but I will check again.
Additionally, the Enermax Fulmo GT looks like more than big enough for the board. Should be no problem to drill a few missing holes. :-)
I will get a P4000L with W2600CR2 or S2600IP from Intel in a few weeks for benchmarking, then I will know more.
 

servxtrem

AAAAAAAAARRRRGHH!!!!
I found my DREAM MAINBOARD !!!!!
Ready for monstrous QUAD GPUs / QUAD crossfire X !
(SuperMicro X9DRG-QF)

THE BEST BOARD ON THE WORLD!!!

 
 
Lol.  I wonder why they put that 2nd and 3d slot there since you won't be able to use them if you, you know, want RAM.

beaker7
Lol.  I wonder why they put that 2nd and 3d slot there since you won't be able to use them if you, you know, want RAM.

Akward form factors and usages spawned need for risers years ago, so if someone or some business wanted all their RAM and all PCIe slots filled with long PCB cards, they can.  Heck, the PCIe cards don't have to be long; no rule afterall.  These companies want the highest number of sales, so they will put the longest slot available rather than shorten it down to imply usng only certain cards. 
 
We know for sure the target market that settled for this didn't choose it for whatever inconvinienced someone else-- a mentality I've noticed mainly among purists that think it is all about them...
 
Not accusing you, just speaking in general and off-topic.