Ok, as I say in the tittle is a possible solution, can works or cannot, but at least in my case is working.
My rig:
4790k 4,5Ghz
32gb ddr3 2400hz
Pagefile 30GB
2x 1080Ti (but only one works in this game since multigpu is not implemented)
3x SSD 250GB
Asrock z87 extreme9 A/C
3 monitor ASUS MG279 in surround portrait displaying 4320x2560
Ok, first i noticed was i was CTD when long races, about 7/8 lap.
With RTSS i saw both VRAMs are above 5-6gb, so no VRAM leak, RAM was about 8GB all time and System graphics memory was about 15gb all time.
System graphics memory is VRAM + 1/2 total RAM, in my case 11GB + 16GB = 27GB total. So no system Graphics memory issues.
So checking my pagefile i set 10GB on each SSD having a total of 30gb virtual memory. Even knowing 30GB is a great amount of VM, i tried something absurd, increase it to 60GB (20gb per each SSD). No more CTD atm.
As i said is absurd having a 60GB pagefile but, taking in count is a 100GB game, could have some sense.
This is not a fix. It is not our responsibility as consumers to create workarounds for a product which cannot stay within spec. A product with recommended requirements of 8GB should never use more than 8GB of memory – virtual or physical.