6 card rx 580 rig only shows 4 cards. any idea's

[CryptoWatcher420]

windows 10 pro
seasonic focus plus plat 850watt on 3 cards and motherboard
evga 850g2 on 3 cards and fans
ssd 128 xpg
8giga xpg memory 266
intel 4600
msi z270 gaming m3
bios set to gen 2 pcie
4g mining on
96 block cycle
2 asus rx 580 top strix model
4 xfx gts rx 580

tried reinstalling windows and all drivers today, no change, tried 1 card at a time and always stops at 4 and somethings it takes a couple restarts for it to see the 4th one. Device manager is only showing 4 not talking about drivers at this point.

set the pci e to get 1

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[ssmokeyy]

all cards and risers work one by one.

[gotminer]

once I install windows again the blockchain is what I'm going to use. I was using the brand new drivers that came out.
Damn the rx 580 price is crazy high now. I was going to order two more tonight but there 450 a card right now.

I don't think you really need to wipe your hdd and re-install the OS.  Use DDU in safe mode and remove the current drivers.  And then try the Aug-23 block chain drivers.  You did make sure that Z270 has the latest bios, correct?

[ssmokeyy]

Yep has the latest bios. Bios update is the first thing I do before os install. With the 4 cards in the system and all it does is load the mpm benchmark and hard locks the system. I wonder if my cpu is bad. When i first  put this one together i had corsair hx1000i that broke 45 seconds on. After that i sent it in for warranty and installed a seasonic 850w. This is also the second motherboard. i haven't changed out the cpu or memory yet. I have not overclocked this cpu at all.

[ssmokeyy]

My NVidia system is doing the same shit now. I have a gtx 1080 system and when it has 4 cards runs solid. I can't overclock it and never shuts off. when I add the 5th card and set everything to base settings I start the miner go to benchmark it and hard lock. I have to shut it down and start over. Computer runs fine until I start a miner any miner. any idea's
NVidia system specs
gtx 1080 5 cards
msi sli plus
intel g4560
8 gigs ada ddr4 2666
windows 10 pro
two 750w seasonic play psu's  3 cards on one psu, 2 cards plus motherboard and ssd on other

[ssmokeyy]

using the same blockchain drivers and 2 hours after my post and the system restarted. wow. This is going to suck if I have to go card by card to find the problem here.