HP XW8600 no POST/BOOT with Geforce GTX 1080 installed

[kaskanter]

Hi TH,

I finally decided to upgrade my old HP workstation with a modern graphics card as the good old Quadro FX4600 has served me well, but it is about time it sat on the shelf.

So, to cut a long story short. Purchased a founder's edition 1080, installed it only to find out that my PSU only has 6-pin PCIe connectors and the card requires an 8-pin one.
I connected the 6-pin connector on the 8-pin socket and the card seems to be powering up to a certain extent (fan spinning and logo illuminating).

However, once powered on, the system will not proceed to POST. There are no beeps and no red LED blinks.

I tried installing the Quadro on the selected Boot-PCIe with the 1080 on the other PCIe and the system boots and enters windows. On the device manager the 1080 appears as a generic VGA adapter (or something like that) and any attempt to install nvidia drivers for it fail.

Is it the case of lack of compatibility of this system to the 1080, or maybe the power issue with the 6-pin into the 8-pin socket?

I feel gutted as I was so looking forward to this 🙁
Any help/advice greatly appreciated

Many thanks in advance

Actions taken:
Updated BIOS to the latest 2012 revision
Reset CMOS
Tried both x16 PCIe slots and interchanged the designated boot one from BIOS

XW8600
800W PSU
2x Xeon X5450
16GB RAM
Windows 7 PRO 64

 

[kaskanter]

Ok here is some update for people that might run into similar issue...

Before returning the card I decided to try to explore the possibility of fitting an adapter to the 6-pin PCIe connector into a 8-pin.
After a visit to local Fry's store and $5.99 later, WE HAVE ACTION!
The system POSTs and boots!
It required some fiddling with the monitor to get signal (disconnected all power connected back and powered on)
Now I installed latest drivers and seems to be working ok.

So, albeit an old system, the XW8600 seems capable of supporting this card. Now need to see how it performs and whether the CPUs bottleneck this too much.

 

[gazzimba]

Ok here is some update for people that might run into similar issue...

Before returning the card I decided to try to explore the possibility of fitting an adapter to the 6-pin PCIe connector into a 8-pin.
After a visit to local Fry's store and $5.99 later, WE HAVE ACTION!
The system POSTs and boots!
It required some fiddling with the monitor to get signal (disconnected all power connected back and powered on)
Now I installed latest drivers and seems to be working ok.

So, albeit an old system, the XW8600 seems capable of supporting this card. Now need to see how it performs and whether the CPUs bottleneck this too much.

Hi.. how is the performance of GTX 1080 on XW8600?