Could you recommend me good tester for USB3.0 A/M-M cables? Inside are 9 wires - http://imgur.com/a/KGTcM

Recently I bought big quantity PCIE USB 1-16x risers from China and I have trouble with them. If more than one card in the rig it is not hashing only pcie errors. When I replace USB cables it works ok. Previous batch from the same supplier was ok.

Is mainboard Biostar TB250 BTC compatible with cheap chinese M.2 to PCIE adapters?
like this http://www.ebay.com/itm/High-speed-PCI-e-1X-4X-Card-to-NGFF-M-2-M-Key-PCIe-Slot-Converter-Card-Adapter-/322553862111?hash=item4b19b557df:g:G9kAAOSwi8VZP7Uw

Somebody with experiences? I need to use 7GPUs on this mainboard and I have trouble with it.

Also I found another more expensive version
http://eshop.sintech.cn/pcie-4x-ssd-as-ngff-m2-m-key-pcie-ssd-adapter-p-1178.html?zenid=3vmcvlm49d60012rf42v2o3sp1

Make it sense to buy this version?. Or it is the same as cheaper version above from ebay?

I found this http://pangolinminer.com/index_us.html

Hash Rate ETH:200MH/s, Zcash:2400 Sol/s,XMR 6500H/S
CPU Intel Broadwell-u 3215, SO-DIMM 4G DDR3L, mSATA 64G SSD
Ethernet 1x Gigabit(Network Controller Intel I210-AT)
USB 2 x USB2.0, HDMI 1 x HDMI(from CPU)
PCI-E Slot 8 x PCI-E x16 2.0(1x)
Graphic Card 8 x NVIDIA GTX1060 6G
Power Connection 7 x 6 Pin 12V
TDP 1000W (Power Supply PANGOLINMINER 1600w)
Windows 10 64-bit
Dimension 495x255x162mm
Weight 14KG (including power supply)
Warranty 12 Months
2099USD

It is also offered by Bitbaza from Russia.

It looks, that it is similar idea as Pandaminer or Lightningasic boards.

Is it reliable source? Any experience,  more information about it?

My friend (central Europe) need to buy aprox. 2000 USB -PCIE risers. Can you recommend me some reliable suppliers from China, who are able to deliver fast this quantity with good price and quality?

40 coupons available, I bought here for 0,01BTC/each, but finally my partner in mining decided not to buy S7...