Business PCs, Workstations and Point of Sale Systems

Just upgraded my Z620 with a GTX 980Ti.

This card requires two 8-Pin PCIe power cables.

I've installed a pair of six to eight pin adaptors as the Z620 only comes with six pin PCIe power headers.

Two sets of these six to eight pin cables have melted now. Completely melted. 

I noticed that HP only have two of the three 12v lines connected on their PCIe power headers so I've modified the 6-8 pin cables to double up on one of the 12V lines actually present on the HP PSU and it has helped a bit, I can run Superposition without melty moments but the six to eight pin cables still get **bleep** hot.

The cables on the HP cables are ice cold.

I'm concluding that the cause is the gauge of wire used on commonly available PCIe 6 to 8 pin converters.

I've used two different brands now, and I've stripped back the sheath on both, they both have stupidly thin guage wire under the insulation. Far thinner than HP use on their PSU cables.

So the question is:

Where can I get beefy AF 6 to 8 pin PCIe adaptor cables that use stonking great conductors?

Help much appreciated.