Ok, so i reset my bios, changed all appropriate PCI settings to Gen2, enabled 4g, re-installed windows 10, ran all updates, disabled update service after that, plopped all 6 sapphire pulse rx 570's into PCI slots 1,2,3,4,5, and 7...then installed radeon crypto drivers and STILL ONLY SEE 5 CARDS.
Anyone got a flamethrower?
Set bios to default and just do 2 things:
1. PCIe Speed to Gen 2 (Advanced -> PCH Configuration -> PCI Express Configuration -> PCIe Speed)
2. Enable 4G
You're going to see 6 GPUs in Devide Manager. If not, your riser has problem

Exactly. U must see 6 gpus on Device Manager, otherwise ur riser sucks