Prebuilt Getting around a PCIe Slot 35W limit

[chn]

So I was fortunate enough to score an old PC from work for EUR 20.00 - an HP ProDesk 600 G3 SFF.

The machine has an Intel i7-7700 CPU, 32GB RAM and a 512GB SSD, and I was thinking about the viability of using it as a gaming machine by adding a GPU.

Unfortunately, being an OEM prebuilt, the PSU is only 180W, and the PCIe x16 slot is limited to only 35W. So I was thinking of transplanting it to another case, and buying a new, higher capacity PSU so that I'm not limited to a single-slot, low-profile, low wattage GPU. I would also need an adapter cable to be able to use the standard ATX connector with the non-standard power input on the motherboard.

However, I'm not sure how I would get around the 35W limit on the PCIe slot. Would this cable allow me to get around that?

PCIE 16X to 16X Riser Card Flexible Ribbon Extend Cable Molex Powered

Buy PCIE 16X to 16X Riser Card Flexible Ribbon Extend Cable Molex Powered for €13.94 with Free Shipping Worldwide (In Stock)

www.moddiy.com

There seems to be a whole lot of conflicting views online about adding GPUs to these office-class SFF machines, for understandable reasons. I'm hoping there is some experience I can draw from here.

 

[BaK]

Never tried anything on that topic, but I would have suggested that the missing 40W from the PCIe slot could be taken from the 6 or 8 pin connector, as mentioned here:

Can you put a 65W GPU in a 35W PCI-E slot?

So, I intend to build a sub $100 rig for light gaming (Half Life 2, Left 4 Dead 2, GTA 4, Crysis etc). I already have a GPU (Inno3D Nvidia GT440) with a TDP of 65W and no external connectors and I'm thinking about getting a Dell Optiplex 790 with a 2nd Gen i3 which has a Q65 chipset and it's...

forums.tomshardware.com

If you have such external connector on your GPU that is...

 

[chn]

Thanks @BaK, I was thinking that already that I would pick something that would also use auxiliary power. Just wasn't sure whether a certain amount of power was expected from the slot itself before the GPU feeds from the 6/8 pin connector.