Long time lurker here but 1st post.
I recently bought a new Samsung PM983 U.2 drive MZQLB3T8HALS-00007 and have it mounted in a Startech PEX4SFF8639 U.2 to PCIe adaptor. The sequential read speeds are exactly what they should be with over 3300MB/s however the write speeds really suck and I'm lucky to see 280MB/s which I think is about 1/8-1/10th of what this drive should doing.
The drive appears to be operating in PCIe 3.0 x4 mode as reported by CrystalDiskInfo and I wouldn't be seeing those sort of read speeds if it wasn't. I've moved the card into couple of different machines as still get the same result. As this is my 1st foray into U.2 I don't have anything else directly compatible to test the drive and adaptor in separately. I do have a M.2 PCIe card and see respectable write speeds on that when used in the same machines.
I'm beginning to suspect this adaptor may not be providing enough power to the drive. This Startech adaptor doesn't rely on any auxiliary power connectors like some other cards have. It also seems devoid of any power circuitry on the card itself and looks very simple.
Besides sourcing an alternative U.2 adaptor to try can anyone else offer any suggestions ?
I recently bought a new Samsung PM983 U.2 drive MZQLB3T8HALS-00007 and have it mounted in a Startech PEX4SFF8639 U.2 to PCIe adaptor. The sequential read speeds are exactly what they should be with over 3300MB/s however the write speeds really suck and I'm lucky to see 280MB/s which I think is about 1/8-1/10th of what this drive should doing.
The drive appears to be operating in PCIe 3.0 x4 mode as reported by CrystalDiskInfo and I wouldn't be seeing those sort of read speeds if it wasn't. I've moved the card into couple of different machines as still get the same result. As this is my 1st foray into U.2 I don't have anything else directly compatible to test the drive and adaptor in separately. I do have a M.2 PCIe card and see respectable write speeds on that when used in the same machines.
I'm beginning to suspect this adaptor may not be providing enough power to the drive. This Startech adaptor doesn't rely on any auxiliary power connectors like some other cards have. It also seems devoid of any power circuitry on the card itself and looks very simple.
Besides sourcing an alternative U.2 adaptor to try can anyone else offer any suggestions ?