Replacing PSU (300W) on HP ProDesk 490 MT G2 Core i7 16GB 128GB SSD

[HenrikM]

Hi, I have an HP ProDesk 490 MT (purchased 2015)  in which I want to place a better Graphics card. The card I purchased requires its own power from the PSU. However, there are no free cables on the existing PSU of 300W, and 300W will not be sufficient to power also the new graphics card. I bught a new PSU with numerous cable connection alternatives, but with I opened up the Prodesk desktop, I found that there where two non-standard cables connected the the PSU. (see pictures)

P5 connected to the DVD/ROM

P2 connected to the motherboard, sitting close the the processor.

Does anyone know if there are adapters wich may help me solve the problem, enabling a female connection to standard cabling of my new PSU, and connecting (male) concats into the DVD/ROM and Motherboard?

Alternatively, if there are new, more powerful, PSUs  which have these two connectors (P2 and P5).

I live in Sweden so if possible, if would be great if I could buy/order as nearby as possible. (Europe?)

Thank you

/Henrik P2 to motherboardP2 to motherboardP5P5

[DGroves]

thanks for a detailed post and pictures, to answer your questions, BOTH CONNECTORS are standard ones

the DVD connector (p5) is one that is usually found on a laptop DVD drive and is usually refered to as a MINI SATA connector

if you plan on keeping the existing dvd all you need is a mini DVD power adapter available on amazon/newegg

https://www.amazon.com/Pin-Slimline-SATA-Power-Cable/dp/B0056N6TMO

https://www.newegg.com/Product/Product.aspx?Item=N82E16812200788

or a adapter to convert it to normal desktop sata 

https://www.amazon.com/Slimline-SATA-Adapter-Power/dp/B002O1W6ZK

https://www.amazon.com/12IN-Micro-Adapt-1-8IN-Drives/dp/B002RCQ6U2

the second connector is a CPU "AUX" power connector that supplies power to the cpu when a motherboard is unable to reliably supply the required power through it's traces  note that this connector has been standard on all ATX power supplies and  motherboards for desktops for the past 10 years or so (when is the last time you looked at a computer?)

last the prodesk has several model revisions G1/G2 and so on the revision is very important as each revision is quite diffrent in cpu/memory/installed pwr supply wattage  and other specs so we need to know this

[HenrikM]

Thank you so much for a detailed explanation.

You are rigt, it was a while ago since I chanaged main-board/PSU. At that time (10 years ago), everything was smooth and I found contacts for everyting. it must have been pure luck!

However, I have contacted three different computer stores in Sweden, and none of them recognised the P5 and P2 contacts and none hade any adapters. I also contacted the store whiere I purchased the computer and after about a week, they responsed that they had contacted HP and received response that it was not possible to upgrade the computer I have. I have contacted HP support, but they just direct me to local HP sales, as they consider it not a post-sale problem.

I cannot say how much I appreciate finally getting in contect with an expert!

I will look att all specifications for the mother board en the PSU I have and post additional details leter on this eventing.

Thanks again.

/Henrik

[DGroves]

you now know three stores to avoid if needing repair services.

as i said the 4 pin cpu aux connector is a standard item found on any full sized motherboard

(low power compact system may not need this connector if the cpu is under 45watts)

one last thing while the pictures helped, you covered the wires/wire color which did make it harder to determine what the connector was for, i could just see the black/yellow wire which confirmed it is for the CPU

[HenrikM]

Thanks again.

I attach som more pictures of the P2 cabling, the Mother-board and PSU specifications.

I'm glat to hear that you say that the P2 is standard plug/contact.

I assumed that everything would be standard when I bought the new PSU, which includes numerous cabling. (Corsair PowerSupply (PSU) RM650i 650W) (suppliers artilee number: CP-9020081-EU).

https://www.corsair.com/us/en/Power/Plug-Type/rmi-series-config/p/CP-9020081-NA

Howver, unpacking it, lthough extensive number of contacts,  I found that that was not the case. I have also asked the three stores if thay have any PSU with has the P2 and P5 connectors, with nagative result. Hence, it seems like my only option is to find adapters, allowing to connect the cables/contacts from RM650i 650W to the Mother-board and DVD/ROM.

Thanks

/Henrik

color of cablign to P2PSU specificationsLocation of the P2 conttactMotherboard specification

[HenrikM · Accepted solution]

Thanks again.

I attach som more pictures of the P2 cabling, the contact location on Mother-board, and PSU specifications.

I'm glat to hear that you say that the P2 is standard plug/contact.

I assumed that everything would be standard when I bought the new PSU, which includes numerous cabling. (Corsair PowerSupply (PSU) RM650i 650W) (suppliers artilee number: CP-9020081-EU).

https://www.corsair.com/us/en/Power/Plug-Type/rmi-series-config/p/CP-9020081-NA

Howver, unpacking it, although extensive number of contacts,  I found that that was not the case. I have also asked the three stores if thay have any PSU with has the P2 and P5 connectors, with nagative result. Hence, it seems like my only option is to find adapters, allowing to connect the cables/contacts from RM650i 650W to the Mother-board and DVD/ROM.

The computer is  HP ProDesk 490 MT G2 Core i7 16GB 128GB SSD. article number 5010874067

Thanks

/HenrikCabeling of P2Power supply specificationlocation of P2 contact on mother board

[DGroves]

do not assume that because HP labels the CPU Aux pwr plug as P2 that that number is part of the ATX standard (it's not)

also hp is not following the ATX color standard for the wires, this plug has +12 and Ground and according to the ATX standard the colors should be "yellow for the two +12 and black for the two ground wires not brown/black as hp has done

last the corsair 650i power supply the "OP" linked to DOES HAVE the CPU Aux connector, it's labeled  EPS/ATX +12 8pin which means it has (Dual) 4 pin connectors

https://www.corsair.com/corsairmedia/sys_master/productcontent/RMi_Manual.pdf

the reasion it has dual Aux cpu/Eps connectors is to be compatable with dual cpu socket workstation/server motherboards which require one 4 pin CPU aux/eps connector per cpu socket

[HenrikM]

Yes, thank you.

I was not sure of if the connector included with PSU was the same as the P2 connector on the motherboard, but I trieed it and it works.

I also bought an adapeter for the P5 contact, so both of these to matters were resolved.

Thank you for all your help!.

I bumped into a separate, totally different matter, but I will open a separate question for this.

The matter was that when I finally got everything to work, I felt that the chassi was to tight for new graphics card, with risk for overheating, I bought a new chassi. Moving everything the new chassi, I needed also to connect new cabling for the Front panel, on/off, Power led, HD led, reset etc. However, I have no documentation on which connector that is what on the mother moard MS 7933 ver 1.0. I get no support from the vedor where I bought the computer, they aregue that HP does not supply such documentation as the computer was 'packeged all ready' and no intended to be upgraded. 

There are 9 pins which I can connect to, two rows of five, with a blank connector in the middle of one row.

1           2              3            4              5

6            7                            8              9

As far as I can see, the power switch cable seem to be connected to 8 and 9.

There also seem to be a loop, connecting 7 with 1. 

6 seem not to be used.

I can try to fiddle with if, but not sure if I risk breaking something if I were to connect them wrongly.

I raise this matter as a separate question.

Thanks again

/Henrik

[DGroves]

your best course of action is to locate a electronics tech, and pay him to trace the wiring from the HP ProDesk 490 MT G2 's front case wiring down to the connector which mates to the motherboard since you lack this skill, and yes connecting or shorting wires/pins can cause a part to become non functional

you want to ID the HD access light, power switch, reset (if enabled) and all of the front I/O, USB, snd, and what not

last, just why did you move the system to a new case? HP spends time to match the thermals of the system with the case

and unless you needed more room for drives, there is no real reasion to change cases

[HenrikM]

Thanks again.

I tried to follow the cables, the power switch was easy. 

However, there are one green and three white cables going into a package on the front-panel.

Unless I break this open,  I cannot see what is what and I cannot see what is +/-.

As there is no specific power/reset button on the front, but there is one power LED and one HDD led, I assume that the 2/3 and 4/5 are for the power led and HHD led respectively. However, I dont see what is +/-. I there a risk for breaking the lead or something on the motherboard if I don't get it right?

Thanks

Henrik

//

When it comes to changing chassi, I replaced  it because I put in a separate (new) graphics card. This new graphics card needed separate power cabling, so I needed to get new PSU. When I finally gor the PSU cabling to work, I found that the chassi was extremely tight with new graphics card..

//