SpyderTracks
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I would uninstall the new drive again and reinstall it, may just not be fitted quite right.I got windows 11 from Microsoft site and installed to usb
I installed all windows updates and gpu driver latest version from nvidia site and optional updates.
Installed furmark.
Not installed any peripherals.
But soon as I do same on new drive in top slot it crashes.
When installed 2nd drive on bottom slot. It's all fine no issues
If you can post your fulll specs again as well, there may be some PCIe lane sharing going on with multiple drives.
Which model drive is in the top primary slot and which is in the second?