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Optiplex 780 SFF
Hello Dell Community,
I hope all is clear for you on this hard times...
Few months ago, i updated a old Optiplex 780 with a SSD, a new grphic card, 8gb of ram and a sound card.
This OP work great and i can play some game, watching HQ videos and more.
I would like to thanks all the poeple than can help me for choose a correct combination of this new parts!
On web search i find a brand new 280W power supply and appear to be able and compatible with the 780SFF
Somebody have hear about that?
The power supply is from the Optiplex XE, there's a video:
https://www.youtube.com/watch?v=tz9CtUHlssY
Now i would like to know if i can put a Q9400 - Q9550 - Q9650 with this new PSU and if i dont have too much bootleneck with my actually graphic card EVGA GT1030 SC ?
This new CPU would be appreciate for multi task and more
Thanks in advance for your help and take care!
P.S.: you can see my all configuration on the signature and if you need more infos please ask me!
redxps630
7 Technologist
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10.4K Posts
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November 25th, 2020 07:00
That is a helpful YouTube video. I am aware of this psu but have not seen a good demo.
if your current psu is doing well for you, there is no need to upgrade it yet unless you want to change to a more powerful gpu.
the Q9650 cpu will work for 780, regardless of psu power rating.
gt1030 is connected to the rest of the system using a PCI-Express 3.0 x4 interface, your 780 has q45 chipset using PCI Express* x16 Gen 2.0. gt1030 is backward compatible and running at gen 2.0 speed and using x4 lanes, thus 2.0x4. Although the x16 slot can support up to 16 lanes, your card only takes 4 lanes.
speedstep
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47K Posts
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November 25th, 2020 08:00
780 and 980 don't have standard 24 pin connector.
Looks like the XE is using the mini power connector also.
https://www.moddiy.com/products/Dell-980-960-780-760-PSU-24-Pin-to-Mini-24-Pin-Adapter-Cable-10cm.html
speedstep
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December 3rd, 2020 09:00
The power for the slot is based on LOW PROFILE.
Thats why they put 25W on it.
Jeanvend
39 Posts
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November 25th, 2020 01:00
My actually CPU:
And my graphic card:
But i have and other question about the PCI Bus Interface, its show PCIe x4 2.0 @ 4x 2.0 what does that mean?
If i run the Render test from GPU-Z the bus interface doesen't change...
Thanks in advance for your help
redxps630
7 Technologist
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10.4K Posts
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November 25th, 2020 09:00
I have a 780SFF working with original psu. That psu is not available to me any more, so I bought a standard 24 to mini ATX adapter thinking it would let me use standard ATX connector. surprise: no power at all. PSU definitely good as tested in other system. I could not figure out why.
redxps630
7 Technologist
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10.4K Posts
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November 25th, 2020 23:00
Jeanvend
39 Posts
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November 25th, 2020 23:00
Hi @redxps630
Thanks for all your info^s
About the graphic card, 4lanes or 16lanes change something about the speed or power?
but normally i think she can be detected on x16 it is thru? its maybe about the sound card plugged on the next pci port...
On some mother board (long time ago on Asus motherboard for my experience), if you put 2 card on the Pci's x16 slots, the BIOS divide the speed and the cards run at x8.
About the PSU and CPU,
Yeah i see on the specs book for the OP780, the IntelQ9550 is allowed, also the Q9650 but is more expensive on Ebay...
But about the power, (the graphic card constructer recommend 300W Psu), if i put the XE Psu (i win 45W) and add the Q9550, the system can be more stable that i have now with the Core2duo?
About your PSu for the OP, i find it on Ebay:
https://www.ebay.com/itm/New-OEM-Power-Supply-Dell-Optiplex-760-780-960SFF-235W-PW116-R224M-H235P-00/293107633042?hash=item443e938b92:g:qPsAAOSwGIZcE1vV
Thanks for your help and have a nice day
Jeanvend
39 Posts
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December 2nd, 2020 02:00
hi everybody thanks for all your answers!!!
Maybe i buy a Q9650 but i have a other option, a OP 790 SFF for 90$
I will check the the spec et decide to mhat im wanna do...
Thanks again for all your info's
speedstep
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December 2nd, 2020 04:00
The X16 the black slot is wired X4 because the max power per PCI-E spec for a LOW PROFILE Card X4 is 25W
Max power for LOW Profile X1 card is 10W.
speedstep
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December 2nd, 2020 04:00
both the 4 pin and 24 pin connector must be attached to the motherboard.
AND it must be an EPS12v PFC power supply
AND it must have 140W or more combined power for the 3.3v/5v rails
Jeanvend
39 Posts
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December 2nd, 2020 23:00
Hi and thanks for your answers
But its a bit more tehcnical for me.
If i well unterstand, if i put more power from power supply, it doesen't change the power for the Pci slot?
Thanks
Jeanvend
39 Posts
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December 4th, 2020 00:00
okok i undertstand right now,
it's phisically block at 35W...
I nerver ear about Pci power lock before
We learn everyday, thanks for all this info's