Upgrade GPU for Elitedesk 705 G5, Power Supply

[rpnautilus]

Hello to the community,

I thought it would be no problem to upgrade my HP desktop PC in Small Form Factor format with respect to the graphic cards. I have a HP Elitedesk 705 G5 (a more or less new generation PC).

There are so many nice graphic cards outside from NVIDIA which are from the last generation and which can be bought for a small amount of money. A good example is the NVIDIA GTX 1060 series from 2016, or the GTX 1650/60 series from 2019. Those graphic cards are not only available in a large format for desktop PCs but also as SFF versions. 

These SFF cards are dedicated to be installed into my SFF desktop on a PCIexpressX16 slot. However, I need to support the card with power (110W in maximum) and I need a seperate 6-pin connector from the power supply to the graphics card. I am more or less sure that the original 180W power supply is not powerful enough and it does not have any 6-pin connector for PCIexpress.

Nevertheless, there should be power supplies which are better suited. I have read from the HP L03980-800 Psu 310W Sff Es Sirius-Gf, which has an extra 6-pin power connector for PCI express. There is no information about the length, width and height of this power supply. Thus, I cannot decide if I can install the device into my computer.

Do you have any suggestions?

[itsmyname]

@rpnautilus -- look at: Free Shipping! HYFAI SATA 15 Pin Male to PCI-E Express 8 Pin 6+2 Pin Video Power Adapter Cable 20cm ...

It connects to a SATA power-connector from your power-supply, and has 6-pin output. Price is only $9.

That would be one step towards your target.

> graphics card with power (110W in maximum)  I am more or less sure that the original 180W power supply

Taking 110 from 180 watts leaves you with 70 watts.  Many CPUs in "non-gaming" computers take something like 65 watts. This leaves insufficient power for the motherboard, the disk-drive, the CD/DVD drive, and power to USB ports.  Sigh.

[rpnautilus]

Thank you very much for your advices.

However, this idea of powering the graphic card with a cable dedicated for SATA drives might be not a good idea. So many people have problems with burning cables out of the reason that the current is too high. It is up to 60Watts which have to be delivered to the graphic card (the rest is delivered by the PCI express slot). That means the cable has to be prepared for 5A or little bit more. The SATA drives typically do not need so much power. I have the fear that I will destroy some electronics by doing so.

It would be a better idea to utilize a power supply coming with a PCI express power cable. But there seems to be no one who can give information which power supplies are an alternative to the internal 180Watts PSU. It would be also nice to hear if someone knows about an adapter converting the ATX20+4Pin to the HP 4 Pin connector. I found a lot of adapters converting ATX20+4Pin to the old HP 4pin connector, but no information about an adapter for the mainboards of the new generation.

[rpnautilus]

Hello to the community,

adding a NVIDIA Geforce GTX 1060TI to the Elitedesk 705 G5 Small Form Factor PC worked fine for me. The main message here is for all the others outside, that the motherboard of the Eliteseries is able to power the graphics card through the PCI express port.

The prerequisite is:

• to buy a second Power Supply Unit (at least 300Watts) with an ATX power connector for the mainboard and a PCIexpress power connector (6+2pin)
• to buy an Add2PSU device which allows to add a second power supply for the HP elitedesk. The Add2PSU should be equipped with a SATA connector and an ATX connector

installation:

1. put the GEFORCE GTX on the PCI express slot (but it might be needed to remove the motherboard out of the Elitedesk case). If you do not want to remove the motherboard you can buy a PCI express Riser cable to place the Geforce GTX elsewhere in the Elitedesk case)
2. connect the second Power Supply with the Graphics card using a 6+2 pin PCI express connector
3. connect the second Power Supply with the Add2PSU device using the 20+4 ATX connector
4. connect the original HP Power Supply with the CPU using a 4Pin connector as well as with the motherboard using a 4Pin connector
5. use the original HP accessory SATA cable and connect it with the motherboard (6pin connector). Then connect the SATA cable with the ADD2PSU device

This is heavily complicated but it works. So, the motherboard is able to power the GFX card through the PCIexpress slot.

Best wishes