Question SYS-6028R-WTR has 4 x PCIe x8 on the Left side of the chassis, we want to find out if we can switch out the RSC-R2UW-4E8 (4 x PCIe x8) with RSC-R2UW+-2E16-2E8 (2 x PCIe x16, 2 x PCIe x8) Answer The motherboard WIO slot is only PCI-E x32. The number of PCI-E lanes required on the RSC-R2UW+-2E16-2E8 is PCI-E x48. Therefore you cannot use this riser card. Please use RSC-R2UW-2E8E16+ (Two PCI-E x8 and one PCI-E x16 slots): https://www.supermicro.com/a_images/products/Accessories/RSC-R2UW-2E8E16_.jpg Was this FAQ helpful? YES      NO Enter Comments Below: Note: Your comments/feedback should be limited to this FAQ only. For technical support, please send an email to support@supermicro.com.  Enter your email address below if you'd like technical support staff to reply:  Please type the Captcha (no space) M 4 7 F FAQ Stats FAQ ID Related Category / Keyword Date Posted Code 23718 N/A 08/12/16     Print Answer