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Optiplex 3020/7020/9020/XE2 Dell 8pin pinout
Dell uses proprietary 8 pin for the motherboard of these systems instead of standard 24 pin. Optiplex 3020/7020/9020/XE2 (and 7040/5040/3040, Inspiron 3650)
to upgrade psu
(1) MT
- Optiplex XE2 T20 7VK45 (365W) D365EM-00 Power Supply T1M43, 1xPCIe 6 pin
- standard ATX psu (24/4 pin) plus 24 pin to 8 pin adapter
(2) SFF
- TFX Optiplex XE2 psu (315W) 4FCWX D315ES-00 D315E001L VX372, 1xPCIe 6 pin
speedstep
8 Wizard
8 Wizard
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October 23rd, 2020 18:00
There is a guy who designed his own adapter. You can however BUY an adapter from MODDIY. Regular power supply must be OUTSIDE THE CASE. its NOT 20 pin ATX its 24 pin EPS 12V 80 PERCENT efficient.
https://raphtec.wordpress.com/projects/dell-poweredge-t20-atx-power-supply-adapter/
Recommended power supply for upgrades.
https://www.bestbuy.com/site/evga-br-series-700w-atx12v-eps12v-80-plus-power-supply-dc-dc-technology-black/6346160.p?skuId=6346160
moddiy cab 359
https://www.moddiy.com/products/Dell-OptiPlex-9020-PSU-Main-Power-24-Pin-to-8-Pin-Adapter-Cable-30cm.html
https://www.youtube.com/watch?v=SCQTj1ei3Ew
speedstep
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8 Wizard
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47K Posts
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October 23rd, 2020 19:00
Dell Optiplex XE 2 Power Supply 315W VX372 looks like it works for 75w card.
https://www.newegg.com/p/1HU-005J-001D1#
miro1360
1 Message
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October 23rd, 2020 15:00
Bro, just a simple cable-on-cable doesn't work because the purple +12V (VSB) on the 8-pin is the stand-by votage. This voltage is special and can NOT be taken from any standard +12V power supply wire. It is special, because it comes from a circuitry which is ON all the time when the power supply is in stand-by (turned-off). The +12V vsb powers up the circuitry on the mainboard and is "waiting" for a power-on signal (power switch on PC, or lan). The only way is to use a step-up DC-DC converter ("purple +5V" from the power supply ==> DC-DC ==> connector purple +5V ..... and connect black GND from DC-DC with black GND on the 8-pin connector).
Alternative is to use a separate power wall adapter which has a +12V stabilized output. Note, any DC-DC or a power wall adapter has to be strong enough (at least 1A on the output).
Zayats1046
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January 1st, 2023 14:00
You have the most detailed explanation on the internet. But I want to ask this question: could there be a problem with this purple wire with a Dell factory PSU, which only responds to a long press of a button on the back, and not on the computer case? (this is the only way to turn on the computer) *
What do you think I should do?
- Buy a new genuine Dell power supply.
- Buy a better power supply with an adapter (for my 9020 board).
- Simply replace the (BIST) button on the Dell power supply with an ( on-off ) button.
Ulises.Chio
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October 5th, 2023 01:46
@speedstep hello, sorry to post here, but I'm trying to connect a 6pin output main power (Dell PSU) to a 8 pin female Dell MoBo. Is there any possible way to do this? I know I'm missing the Standby purple cable in this 6 pin config.
bradthetechnut
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October 5th, 2023 02:57
Speedstep hasn't been on this forum for over a year now.
As far as I know, one can't use a PSU with 6-pin MB connector on an 8-pin MB, even with an adapter. The same goes for 24-pin to 8-pin, the reverse doesn't work.
CasualMe
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December 14th, 2023 15:35
can i use the psu of dell optiplex 3020 mt for my 3020 sff motherboard?
bradthetechnut
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December 15th, 2023 00:51
Yes, shouldn't be a problem.
I take it your 3020 SFF MB isn't in the original case.