DCS on Separate Drive...

Quick silly question, but should I be expecting a performance hit moving DCS on to it's own Drive? My system (c:) drive is a NVMe Samsung 960Pro, I recently installed a second NVMe 970 Pro and gave DCS it's own drive. I swear i took a performance hit.

Could it be that I did a copy and paste to the new drive instead of a clean install?

It doesn't make any sense to me.

Should not have taken any hit. If I were to do that to be safe, I would have gone ahead with a fresh install. PITB for sure though.

You could try a repair and see if that helps.

As long as you dont stress both drives at full stroke you should not get to the point where it shows that you only have 4 Lanes to the CPU from your PCH but any of the NVMe wants those 4 Lanes for itself.

On some boards, here the boards do differ, the vendor has choosen to disable moew than just Sata 5+6 but also some PCIe slots etc. to have another 4 lanes for a 3rd NVMe. That reads nice on the box but performs terribly bad if you stress all3 cards at once, they all share the 4x link PCH<->CPU but would need a 12x link. This, really sux.

Most users as of today won't have 2 NVMe and those who do plan to use them have different chipsets like X299 or AMD Threadripper, those have multiple direct to CPU links for those.

I doubt that you see a speed penalty in DCS. Therefor DCS is not brutal enough to disk I/O and you would need another app on C-Drive doing the same thing, THEN we would pay the price for desktop chipsets with an I/O collapse. But DCS should never get close to that point to flood a 4x link on disc I/O....not yet LoL.

Have you installed the latest firmware for the 970Pro and the latest Samsung NVMe driver ( 3.0 iirc )?

If in any doubt, as dburne says, wipe the disc, format it, reinstall from scratch.

NVMe shares bandwidth and if you're using 2x drives you may need to configure BIOS to get full speed on the 2nd drive.

Q1) What motherboard do you have?

Q2) Do you have any SATA drives in the system?