Wanting to upgrade a ProDesk 600 G3 MT

[raynebc]

This computer has its original 250 watt power supply, but I saw a helpful thread indicating that a 400 watt power supply should be a compatible fit:
https://h30434.www3.hp.com/t5/Desktop-Hardware-and-Upgrade-Questions/Upgrading-HP-ProDesk-600-G3-MT/...

The reason for the power increase is that I wanted to add a graphics card, maybe something like an ASUS GTX 1660 Super which reportedly has a TDP of 125 watts.  I'm optimistic that a 400 watt power supply should be enough for this system and graphics card, but am I overlooking anything important like power adapter cables (presumably a 6 pin to 8 pin PCIe power adapter) or voltage rail limitations with this combination of equipment?

[NonSequitur777 · Accepted solution]

@raynebc,

Welcome to our HP User Forum!

Thank you for finding my Forum contribution helpful.

Yes indeed, a 400-watt power supply is more than sufficient to power a GTX 1660 Super graphics card: ASUS GTX 1660 SUPER GAMING OC Specs | TechPowerUp GPU Database.

[EDIT:] Please be aware that there are different versions of the same 400-watt HP 942332-001 power supply.  Make sure you select a unit that comes with the 7-pin "P2" power connector wired with six wires (not three wires) :

Please verify with Seller that the power supply unit you get has been fitted with one 6+2-pin (8-pin) PCIe power cable.

If the power supply unit comes with only one 6-pin PCIe power cable, whereas a GTX 1660 Super requires an 8-pin PCIe power cable, you can still make this work with a dual female 6-pin PCIe to male 8-pin PCIe power adapter cable, such as this one: https://www.amazon.com/Female-TeamProfitcom-Adapter-Braided-Sleeved/dp/B07V4GGS43/ref=sr_1_1?crid=4J....

If the power supply unit comes with only one 6-pin PCIe power cable, you also need a male SATA 15-pin to 6-pin male PCIe power adapter cable, such as this one: https://www.amazon.com/Monoprice-108494-8-Inch-15-Pin-Express/dp/B009GUP6O0/ref=sr_1_4?crid=24IAKI4W....

You plug in the 400-watt power supply's male 6-pin PCIe power cable to one of the two female 6-pin PCIe power connectors, and connect the male SATA 15-pin to one of your motherboard's female SATA 15-pin power connectors, and connect the male 6-pin PCIe power connector into the remaining female 6-pin PCIe power connector, and then plug in the male 8-pin PCIe power connector to your GTX 1660 Super.

This should work A-OK!

Hope this was helpful.

Kind Regards,

NonSequitur777

[raynebc]

I greatly appreciate your expertise.  I'm not understanding where the 15 pin female SATA plug is on the motherboard though, would you be able to point out where it is?

https://www.ebay.com/p/23038053798?iid=204253850672

Or does it plug into one of the SATA power connectors (like what powers my SATA SSD) on the 4 pin ATX power cables that plug into (draw power from) the motherboard?

[NonSequitur777]

@raynebc,

You're quite welcome.

Yes, you should have plenty of (spare) female 15-pin SATA power cable connections available in your HP ProDesk 600 G3 MT:

Kind Regards,

NonSequitur777

[raynebc]

I just wanted to make sure I understand your steps.  I have a couple extra SATA power connectors from the power cables plugged into the motherboard.  I will go ahead and purchase the parts.  This should put some new life in the computer.  Thank you again.

[NonSequitur777]

@raynebc,

You're welcome -if you have any additional questions, don't hesitate to follow up.

Kind Regards,

NonSequitur777

[raynebc]

So the power supply arrived and it is the expected HP part number (942332-001), but it unexpectedly has more power cables than we thought.  It has two 4-pin connectors, two 6+2 pin connectors and the small 7 pin connector:

https://drive.google.com/file/d/1fb9ez1W1dWhVkuNEeDG7N6aam7kyod6P/view?usp=share_link

Since this is the case, do I even need to use the extra adapter cables?

[NonSequitur777]

@raynebc,

That is excellent news: no, in that case, you do not need the extra adapter cables!

And, as mentioned, a 400-watt power supply is more than sufficient to power a GTX 1660 Super.

Kind Regards!

NonSequitur777

[NonSequitur777]

@raynebc,

Still can't believe it: 2 x 6+2-PCIe power cables!

And the small "P2" connector is a fit in your ProDesk 600 G3 MT?

Better still, does the power supply power/boot your desktop without any issues?

Kind Regards,

NonSequitur777

[raynebc]

A "90E-Power Supply Fan Not Detected" message blocks the boot process until I hit Enter.  This isn't a show stopping problem, since I can feel air blow out from the PSU and Windows boots, but it is a problem in that if the computer restarts I won't be able to access it remotely until I am there to hit the stupid keyboard.  I saw in another thread you posted that there is no fix short of wire modding, and no way to turn this message off in the BIOS.  Am I stuck with this message permanently?