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I have a 3090FE but my new psu has one 12+4pin, doesn't fit the gpu as the 3090 only has 12pin not 12+4pin is there an extension that goes from 12+4 to just 12pin?
Don't do it unless your fully understand the wiring but my understanding is 2 wires are sense and 2 are ground. Rather than. Butcher your own cable maybe by an extension cable mite be easier to mod.Phanteks revolt 850w sfx but have no space to use that adapter with two pcie 8pins and can't find the box for the 3090 to get the adapter was thinking of just chopping the extra 4 ground pins off the cable but not sure if it would work.
I assumed not because the op said it didn't fit.Is the 16 pin not backwards compatible?
PCIe Gen5 power connector is compatible with GeForce RTX 30 Founders Edition - VideoCardz.com
PCIe Gen5 connector fits Molex MicroFit 3.0 used by NVIDIA RTX 30 Founders Edition Over the past few months, there were numerous reports about next-gen GPUs equipped with next-gen power connectors. At the same time, power supply manufacturers are beginning to show off new products equipped with...videocardz.com
Is the 16 pin not backwards compatible?
PCIe Gen5 power connector is compatible with GeForce RTX 30 Founders Edition - VideoCardz.com
PCIe Gen5 connector fits Molex MicroFit 3.0 used by NVIDIA RTX 30 Founders Edition Over the past few months, there were numerous reports about next-gen GPUs equipped with next-gen power connectors. At the same time, power supply manufacturers are beginning to show off new products equipped with...videocardz.com
No the new 12+4pin cables on the new power supplies will not fit due to no space for the +4pins to seat.
I'm now thinking this maybe the reason I give my wife to justify gpu upgrade "I can't return this new psu so I'll just have to get that darned 4090".