what is the proper way of attaching and using a graphics card on P4308CPMHGC if the card has a 6-pin power connector?
There's only a single 4-pin cord available out-of-the box, and also 4 other 4-pin slots on the power distribution board.
According to the Tech manual, the output power harness these 4x4-pin connectors are for graphics cards, but 4-pins don't quite cut it when you require a 6-pin connector.
Page 149 / 22.214.171.124 Output Wire Harness
Connector only (no cable) N/a P12 4 Aux baseboard power connector for PCIe slots
Connector only (no cable) N/a P13 4 GFX card aux connectors
Connector only (no cable) N/a P14 4
Connector only (no cable) N/a P15 4
Connector only (no cable) N/a P16 4
I'd really like another solution for powering the GPU, not using the Molexes.
I found another P4000 Family configuration guide and there's a Chassis Maintenance kit / Electric Spares Kit (Product Code: FUPMESK, MM: 915653, EAN: 00735858236003) that as 2x GPGPU power cables, one 2x2 pin header to one 2x4 pin header & one 2x3 pin header which are 1100mm in length.
Can you please find out whether these GPU cables can be purchased separately or do we have to buy the entire kit which has quite a lot cables that we don't require?
To answer your question, the cables are not sold separately through Intel distribution. If you are looking for that specific solution we recommend getting the complete kit.