Hi all, I'm having some trouble with the Silverstone 800. I'm planning on running SLI on an MATX motherboard and I seem to be one connector short. The MSI motherboard has an additional 6 pin power requirement in addition to the usual 24 pin & 8 pin sockets.
The (1 x 8 / 4-Pin EPS / ATX 12V connector(400mm) ) doesn't seem powerful enough to power the 8 pin & 6 pin connectors the motherboard requires. I previously used it to power an 8 pin on a test build motherboard and it worked fine. I'm thinking I may have to switch out motherboards to the EVGA X299 micro (the only other X299 MATX available) because it only has one 8 pin connector.
Does anybody know of a different workaround other than replacing the motherboard? I originally wanted the EVGA but the MSI came out first so I snagged it, it wouldn't be the end of the world to switch. I like EVGA better anyways.
Thanks in advance for any help provided.
Build
CPU 
Intel - Core i9-7920X 2.9GHz 12-Core Processor
$1079.99
CPU Cooler 
EVGA - CLC 280 113.5 CFM Liquid CPU Cooler
$115.80
Motherboard X299M GAMING PRO CARBON AC $299.99
Memory 
G.Skill - Trident Z 16GB (2 x 8GB) DDR4-4133 Memory
$215.75
G.Skill - Trident Z 16GB (2 x 8GB) DDR4-4133 Memory
$215.75
Storage 
Samsung - 960 PRO 512GB M.2-2280 Solid State Drive
$289.00
Video Card 
Zotac - GeForce GTX 1080 Ti 11GB Mini Video Card (2-Way SLI)
$729.99
Zotac - GeForce GTX 1080 Ti 11GB Mini Video Card (2-Way SLI)
$729.99
Case 
Lian-Li - PC-TU100B Mini ITX Tower Case
$79.99
Power Supply 
Silverstone - SFX 800W 80+ Titanium Certified Fully-Modular SFX Power Supply
$179.99
Operating System 
Microsoft - Windows 10 Pro OEM 64-bit
