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HP Recommended
Z620
Microsoft Windows 10 (64-bit)

back to my first post last year Z620 pci-e G1 & G2 auxiliary power cable  

This is how I understand now the numbers provided in this link GPU Power consumption 

 

first thing is the G1 & G2 are 5pinout and not 6, there a 12v pinout not used, check images on google for part number 644339-001.

G1 & G2 are spllited from 8pin attached to PSU (4 wires 12v & 4 wires  GND), then after split, each auxiliary power cable (G1 & G2) take 2 wires 12v and 2 wires converted to 3 for GND.

 

from that it come the 300w limit (75w for each wire*4=300w), and the limit is for GPU's who are using G1 & G2, both on same card or on differents cards, and not for GPU's who are powered up from pcie slot only, like Quadro 2000 series.

 

and now the number 225w, this number is for one GPU who use one auxiliary power cable G1 (75w*2wires 12v=150w) + power who come from pcie slot 75w, that mean G1(75w*2wires 12v)+75w pcie=225w and same thing for G2 if it connected to 2nd GPU on 2nd pcie slot 16x.


yes we can say the psu can deliver more than 150w per cable, but for safety and overheating of cables (G1 & G2) or any additional adapter 6pin to 8pin (check image on twitter link in first post), because there is only 2 wires 12v and not 3.

 

and last thing the adapter 6 to 8 pin part number N1G35AA -00X they provide only 2 wires 12v.

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