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 boost

📏Slim 6” x 1.1” x 1” profile

🖥️Plug & play simplicity

14102CFA

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Description

⚡ Power up your rig, no hacks required!

OPTIMIZED POWER DISTRIBUTION - Solid-state PC board ensures efficient, non-heat generating load sharing.
COMPACT MOUNT ANYWHERE DESIGN - Slim profile with pre-drilled holes fits seamlessly in any rig.
EFFORTLESS DUAL PSU INTEGRATION - Add more power without cutting or soldering—just plug and play.
PERFECT FOR POWER HUNGRY SETUPS - Supports high-demand video cards, hard drives, cooling fans, and lighting.
SEAMLESS SECONDARY PSU ACTIVATION - Secondary power supply powers on automatically with the primary unit.

The Add2PSU by Genetek Electric is a compact, plug-and-play adapter that enables dual power supply setups without any wiring modifications. Designed with a slim profile and solid-state circuitry, it optimizes power distribution for high-performance PCs, supporting additional video cards, drives, and cooling systems while maintaining system integrity and ease of installation.

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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