Hello,
I have completed a NVMe Host Bus Adapter that plugs into a PCI-e x4 slot and provides 4 lanes of Gen3 data to a SFF8612 OCuLink connector
and then through a SFF8611 to SFF8643 adapter cable. During my testing I have been able to access an intel DC P4600 1.6TB U.2 SSD.
On one of the X16 PCIe-Connectors for an ASUS B150 Pro Gaming Motherboard provides 3300+ MB/sec sequential read performance with Crystal Disk 5.1.2 benchmark
But when I plug it into the Video slot I only get 850+MB/sec read performance.
I also have a passive HBA solution that provides the 3300MB/sec in that video slot.
My configuration for the De-emphasis is a 1,0 for both A and B ports
My configuration for the Equalization is R,R for both buses.
I also installed the card in to an ASROCK Z270 Supercarrier system which has 4 x16 slots and with the active card I only get the 800+MB/sec Read and Write Performance
Is there anything in UEFI that could cause the bus to be reduced to single lane operation?
I initially had a zero ohm resistor shorting the X1 to X4 Present signals with pin A1 but removed that connection.
Any information and things to check would be appreciated.
Bob
