1 Rookie
•
4 Posts
0
179
February 21st, 2025 23:11
XPS 8960, installing RTX 4080, i9-14900
I have a Dell XPS 8960 Desktop with an i9-14900 cpu and the optional 1,000W PSU. I want to install a PNY RTX 4080 XLR8 into the PC. I have four issues --
1) the PSU has two 8-pin plugs each with a 6-pin pigtail (ie four plugs total). The 4080 GPU has a 12-pin socket. and comes with an adaptor cable for three 8-pin power plugs going to a 12-pin plug. Can I use the PNY adaptor with only two 8-pin power plugs? Should I use one of the 6-pin and the two 8-pin? Do I need an adaptor for two 8-pin to 12-pin? Or do I need a different power supply?
2) The size of the PNY RTX 4080 fits the pc case, but the wires out of the 12-pin plug have to be bent 90 degrees very close to the plug or the side panel will not fit. There are tons of warnings on the web regarding overheating plugs due to just such a bend in the wires that damages or misaligns the pins/contacts in the plug/socket. Is there a solution for this?
3) The PNY RTX 4080 draws 320w. My understanding is that each 8-pin plug supplies 150W, so two provide 300w. In addition the PCIe x16 slot provides another 75w -- totalling 375w. Is that correct?
4) Finally, if I eventually want to get a 5090 would using the two 8-pins, two 6-pins, and the bus 75w give me 675w total? I think the 5090 draws 600w maximum.
Any help would be greatly appreciated.
Lan_rover
1 Rookie
•
4 Posts
0
February 28th, 2025 04:18
Ordered a Y-cable from modDIY.com. Cable has two 8-pin sockets at one end and a 16-4 plug that is bent 90 degrees. Hoping the 90* bend would allow me to close the lid on the XPS 8960 without deforming the wires or plug/socket.
It is a very tight fit, top of 16-4 plug touches the side panel, but the panel does close without forcing it. Have run Passmark & CineBench with no power or temp issues (side panel was off).
The PNY Nvidia RTX 4080 XCELR8 is 332 x 138 x 71mm. Any card wider than 138 will not fit in the XPS case. Not sure that a card longer than 332mm will fit as I had to drop it in diagonally then swing the end to line up with the PCIe slot. I doubt I could do this with the air cooler installed, but it was ok with the water cooler. Finally please note this is a three slot card so the two extra X4 PCIe slots are blocked and not usable.
I'd advise anyone that wants a 4080, 4080s, or 5080, get the SFF models from ASUS or Gigabyte. They are 126mm high vs 138mm -- a 0.47" difference. Also carefully examine the power socket to see if it is recessed into the body of the GPU. That would help with the wire routing (you might still need the 90* adaptor too).
Hope this helps someone out there.
Lan_rover
1 Rookie
•
4 Posts
0
February 24th, 2025 05:33
TMI, to the point --
How to power an RTX 40xx or 50xx in a Dell 8960 with the optional Dell 1,000w PSU?
PSU has two 8-pin and two 6-pin pigtails for powering a GPU.
GPU has one 16+4 socket with adaptor to three 8-pin sockets.
Element115s4
2 Intern
•
284 Posts
0
February 28th, 2025 14:12
This is a good question and while I don't have the answer, we always have to be wary about expanding a pre-built PC like these Dell's.
I am planning on a 5070 which my 8950 XPS w/750w PS can easily handle regarding both the power connectors and the extra 50w of heat that will be generated over the 200w of my 3060 TI.