Based on the customer reviews, we have tested again,pls note:
Each adapter card does not support 24-hour uninterrupted use, because it is a precision technology product,uninterrupted use will cause it stopping work. Pls let this card rest for 1-2 hours after using it for several hours. If you need to use it all day, please purchase 1-2 pcs adapter card for replacement.
Specification:
Bus Type: PCI-E X1
Port Quantity: 4 X USB 3.0
Size: approx. 120 X 55 X 75 mm/4.72 X 2.16 X 2.95"
Product Weight: approx. 70 g
Supported OS: Compatible with DOS, Linux, Windows XP/Win7/WIN8/WIN10

Attention:
1. Due to WINS limit the number of graphics cards, in WIN10 can only recognize up to 8 graphics cards, WIN7 can only recognize 6 graphics cards, and to use the revised graphics card driver, on one motherboard pls use with the same type of graphics card.
2. 8 graphics cards or more quantity pls to use LI·NUX system.

Riser Card Set (No cable/4*sata cables to options):
Features:
2 layer PCB bard designing.
Use for graphics card mining
1-slot PCI-E 1X to 4 slot 16X riser card with high speed USB 3.0 cable.
High speed USB 3.0 shield cable is flexible for 1U,2U,3U chassis.
Support 4 port high speed PCIe 16X card.
Solid capacitor provide extra stable power supply for PCI-e card
USB cable length:60cm/23.63" (Approx.)
Quantity: 1Set