I know someone mentioned this in the comments but just to be sure, can a second one of these be used to join a second psu (total of 3 psus) ?

Yes, you can daisychain 2+ PSU but make sure that your specific units will maintain required voltages always.

The 2nd psu powers on a fraction later then the primary and all the gpus on 2nd aren't being detected by my motherboard, how do solve this?

power should be instantaneous so .... its something to do with your first psu or the molex rail you are using.

Does it matter which components are powered by each psu? for instance, should a matching gpu + riser all be in 1 psu, or is mix-n-match fine?

The other person is wrong. You want to power both parts of your riser/gpu pair with the same psu. Don’t mix and match

How many psu can I connect to this ?

Well there are 2 plugs on this, one comes from psu that powers mobo, other sends on signal to second psu. I would imagine you can chain together 3 or 4 psu if required.

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Multiple Power Supply Adapter and Daisy Chain Connector, Add2PSU by Genetek Electric (Black)

Multiple Power Supply Adapter and Daisy Chain Connector, Add2PSU by Genetek Electric (Black)

Product ID: 43045955

Details

Brand
ANBUY
Compatible Devices
Personal
Connector Type
atx molex
Cooling Method
Air
Form Factor
ATX
Item Weight
0.01 Ounces

⚡Dual PSU power sync

🔥Non-heat generating solid state board

🖥️Compact 6” x 1.1” x 1” slim profile

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Description

⚡ Power up your rig like a pro—no hacks, just pure plug & play magic!

INSTANT POWER SYNC - Secondary PSU powers on/off milliseconds after the primary for flawless coordination.
ULTRA SLIM MOUNT ANYWHERE - Pre-drilled holes and compact size fit perfectly in any setup.
EXPAND YOUR RIG FEARLESSLY - Add more power for GPUs, drives, and fans without compromising PC integrity.
SEAMLESS DUAL PSU INTEGRATION - Plug & play design powers your rig without soldering or cutting wires.
SAFE EFFICIENT POWER DISTRIBUTION - Solid state PC board ensures cool, reliable operation under heavy loads.

The Genetek Electric Add2PSU adapter is a compact, solid-state power solution that enables seamless dual power supply setups. With easy plug-and-play connectors (4-pin Molex and 24-pin ATX), it safely synchronizes two PSUs to deliver enhanced power distribution for demanding PC builds, mining rigs, or high-performance gaming systems—without any soldering or wiring modifications.

Specifications

ASIN	B0711WX9MC
Best Sellers Rank	#1,075 in Computer Power Supplies
Brand	ANBUY
Compatible Devices	Personal Computer
Connector Quantity	2
Connector Type Used on Cable	atx,molex
Cooling Method	Air
Customer Reviews	4.5 4.5 out of 5 stars (187)
Form Factor	ATX
Item Dimensions	5.98 x 1.1 x 0.98 inches
Item Weight	0.01 Ounces
Manufacturer	Genetek Electric
Maximum Input Voltage	240 Volts (AC)
Mfr Part Number	4330127275
Minimum Input Voltage	12 Volts
Model Name	Add2PSU
Model Number	4330127275
Power Supply Design	External
System Bus Connector Type	24-pin,4-pin
Unit Count	1.0 Count

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