Error with Ubuntu 18.10 + Nvidia 415.27 driver

The hard I am using is the original Geforce Titan). Get the following error on installing the nvidia driver. (Nouveau works just fine on this machine with this exact card). I have attached the output from nvidia-bug-report.sh to this post.

Feb 3 00:14:36 dman-Super-Server kernel: [ 10.876688] nvidia-nvlink: Nvlink Core is being initialized, major device number 237
Feb 3 00:14:36 dman-Super-Server kernel: [ 10.881298] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 390.87 Tue Aug 21 12:33:05 PDT 2018 (using threaded interrupts)
Feb 3 00:14:36 dman-Super-Server kernel: [ 10.912552] nvidia-modeset: Loading NVIDIA Kernel Mode Setting Driver for UNIX platforms 390.87 Tue Aug 21 16:16:14 PDT 2018
Feb 3 00:14:36 dman-Super-Server kernel: [ 10.937971] [drm] [nvidia-drm] [GPU ID 0x00002100] Loading driver
Feb 3 00:14:36 dman-Super-Server kernel: [ 10.937974] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:21:00.0 on minor 1
Feb 3 00:14:36 dman-Super-Server kernel: [ 12.543166] nvidia-uvm: Loaded the UVM driver in 8 mode, major device number 236
Feb 3 00:14:36 dman-Super-Server kernel: [ 17.580062] NVRM: GPU at PCI:0000:21:00: GPU-f25b4845-bf30-8efc-af6b-fb3d3330256f
Feb 3 00:14:36 dman-Super-Server kernel: [ 17.580065] NVRM: GPU Board Serial Number: 0323713056202
Feb 3 00:14:36 dman-Super-Server kernel: [ 17.580069] NVRM: Xid (PCI:0000:21:00): 79, GPU has fallen off the bus.
Feb 3 00:14:36 dman-Super-Server kernel: [ 17.580070] NVRM: GPU at 0000:21:00.0 has fallen off the bus.
Feb 3 00:14:36 dman-Super-Server kernel: [ 17.580071] NVRM: GPU is on Board 0323713056202.
Feb 3 00:14:36 dman-Super-Server kernel: [ 17.580575] NVRM: A GPU crash dump has been created. If possible, please run
Feb 3 00:14:36 dman-Super-Server kernel: [ 17.580575] NVRM: nvidia-bug-report.sh as root to collect this data before
Feb 3 00:14:36 dman-Super-Server kernel: [ 17.580575] NVRM: the NVIDIA kernel module is unloaded.
Feb 3 00:14:40 dman-Super-Server kernel: [ 21.813755] NVRM: RmInitAdapter failed! (0x12:0x45:1920)
Feb 3 00:14:40 dman-Super-Server kernel: [ 21.813797] NVRM: rm_init_adapter failed for device bearing minor number 0
Feb 3 00:14:40 dman-Super-Server kernel: [ 21.814134] NVRM: request_irq() failed (-22)
Feb 3 00:14:40 dman-Super-Server kernel: [ 21.816956] NVRM: request_irq() failed (-22)
Feb 3 00:14:44 dman-Super-Server kernel: [ 25.708635] NVRM: request_irq() failed (-22)
Feb 3 00:14:48 dman-Super-Server kernel: [ 29.454198] NVRM: request_irq() failed (-22)
Feb 3 00:14:49 dman-Super-Server kernel: [ 30.453128] NVRM: request_irq() failed (-22)
Feb 3 00:14:50 dman-Super-Server kernel: [ 31.449940] NVRM: request_irq() failed (-22)
Feb 3 00:14:51 dman-Super-Server kernel: [ 32.460323] NVRM: request_irq() failed (-22)
Feb 3 00:14:52 dman-Super-Server kernel: [ 33.451435] NVRM: request_irq() failed (-22)
nvidia-bug-report.log.gz (1.18 MB)

Probably insufficient power supply.

Previous searches suggested that might be the issue, so I ruled it out for the following reasons -

a. A Vega64 works well in this machine.
b. Nouveau works well with the same card in the same machine
c. Power supply in question is a Seasonic 1300W and this is the only graphics card in the machine. PSU should be more than sufficient.

Nouveau doesn’t reclock, so it works at very low power level.
Make sure power connectors are properly seated, unplug and reconnect them. Reseat the card, change slots.
XID 79 is a shutdown due to overheating or voltage drop.