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Good News, :D PCi-e risier hub is now available to add more GPU mining for my Zcash , Eth and etc.... For those who had limited pci-e slots in their Motherboard. I wanted to receive this for my christmas!

PCI-e Express 1X to 3 Port 1X Switch Multiplier HUB Riser Card
https://i.imgur.com/wnusElx.png

Anyway you can find out more info or free shipping from here -> http://tinyurl.com/gmclx9n
  
    2 layer PCB bard designing.
    Compliant with PCI express 2.0, 1.1 Specification
    1-slot PCI-E 1X to 3 slot 1X riser card with high speed USB 3.0 cable.
    High speed USB 3.0 shield cable is flexible for 1U,2U,3U chassis.
    Support 3 port high speed PCIe 1X card.
    Solid capacitor provide extra stable power supply for PCI-e card
    Mainboard size:(L*W*H)9.70*6.30*1.30cm/3.82"*2.48"*0.51"
    PCI-E Card size:(L*W*H)11.90*6.60*1.90cm/4.69"*2.60"*0.75"
    USB cable length：0.55m/1.8ft. For good performance 2 GPU in one riser hub
    1 set .

By the way Zcash is now us$39+ per zcash coin.

I've been looking for this and didn't even know it.

thanks.

might as well go all out with this pci to pci-e card as well: http://www.ebay.com/itm/Startech-PCI-to-PCI-Express-x1-adapter/192044903980?_trksid=p2047675.c100009.m1982&_trkparms=aid%3D888007%26algo%3DDISC.MBE%26ao%3D1%26asc%3D38530%26meid%3D54fadd2a37a148a4b12c1c1eb11837e5%26pid%3D100009%26rk%3D1%26rkt%3D1%26sd%3D201547872916

or this baddass 16 pci-e hub: http://magma.com/products/pcie-expansion/expressbox-16-basic/

Do you have to make any additional configurations to make sure your system will accept the additional cards?  What would be max?  How stable is this?

Technically the only thing limiting your cards is your drivers. In theory you should be able to have 20 of them in one rig...

but you know...it never truly works out that way. Turns out it's based on the motherboard/cpu's chipset: http://www.imgur.com/a/8PZJD

It's not going to be any less stable than using pcie risers...I guess one more link in the chain to be weak if something does go wrong.

Honestly though...if you need 3 more pci-e lanes you should just pick up one of these: http://www.newegg.com/Product/Product.aspx?Item=N82E16813157729&cm_re=embedded_solutions-_-13-157-729-_-Product

Costs a little more but you've got that added bonus of being able to cpu mine on a quadcore cpu with a tdp of 10w

depand on your psu, 3 at max. no configuration needed. same as installing your pci-e riser to the motherboard

I power my video cards with a 4K combo kit so the power is there. Just wanted to see what,if anything else,I needed to consider.

So, you have power...you have a mobo/cpu combo that will support 40x pcie lanes?

Technically you could have 40 gpu's all octo-pussed out.

That's just my layman's translation. I'm probably wrong but I know something similar has been done before.. I just hear it's tricky getting past 6 gpu's in a rig.

Okay... pci-e expansion backplanes: http://www.cyclone.com/products/expansion_backplanes/

why add 2 ports when you can add 16?

the question is are they stable? :)

Yeah, I spent an hour researching the backplanes and you have to custom order them. They aren't as cost effective as a couple of these multipliers...

However, windows 7 is supposed to be able to handle 32 GPU's

I am not sure about win7, but i know win 10 can. Maybe you are right ;)

I ordered one of them, I'm going to expand my 2 pcie ports to 4 and then 6 if they work. I'm able to easily run a 1050ti off the 1x to 16x riser.

I'm pretty sure that the only bottleneck would be data transfer...and of course the cpu infrastructure will also have a hardware limitation on pci-e lanes.

I'll let you know about it's functionality in a month when it arrives from china.