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Inspiron 3668, PSU upgrade
Hi.
I am helping my friend with upgrading just purchased Inspiron 3668 GPU upgrade. He want to go stronger than GTX 1050TI and thus, will need PSU upgrade.
I am aware about 8 pin MOBO PSU connector, Moddly will help here, but PSU itself?
I found a few Bestecs PSUs (not the best quality, oh well), First and Second.
Question regarding actual physical fit dimensions, would it work. Anyone knows?
I also found similar Bestec on Amazon with the list of older Dell supported models, too much to take space here, please check the LINK. Would those Bestecs fit Inspiron 3668 as well.
If someone (like SpeedStep) knows better alternatives, we are open for suggestions.
Please advise.
Appreciate in advance as always.
speedstep
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September 3rd, 2018 09:00
The INSPIRON 3668 is SUB COMPACT. Which means it wont take full size cards let alone anything near a full size power supply. Looking in the Service manual I see that its a 6 PIN not 8 pin like the 3650. They don't like you updating or upgrading.
Using power supply Outside the case with an adapter is possible. This is the UGLY MOD but it works.
https://www.moddiy.com/products/Dell-OptiPlex-3040-3050-3060-Main-Power-24-Pin-to-6-Pin-Adapter-Cabl...
https://topics-cdn.dell.com/pdf/inspiron-3668-desktop_service-manual_en-us.pdf
The VOSTRO 3667/3668 is even smaller.
https://topics-cdn.dell.com/pdf/vostro-3667-desktop_owners-manual_en-us.pdf
If you wanted to upgrade you should not have purchased a sub compact.
Short Cards will fit. Power supply would have to go outside the case running wires thru the hole left behind by removing the power supply entirely.
HOWEVER you need to hack the power supply as the stock unit is too tiny and too small. The 4 pin ATX power connection is fine but the 24 Pin needs an adapter to 8 pins. Recommended power supply is also very specific.EVGA SuperNOVA 750 B1, 80+ BRONZE 750W, 110-B1-0750-VR
The B1 works fine. B2 BQ G2 GS etc DOES NOT WORK. You have to remove the stock unit and leave the new unit OUTSIDE The case because it physically does not fit inside. Secure Boot must be OFF and Legacy CSM on.
https://www.amazon.com/gp/offer-listing/B00K85X23O/
https://www.moddiy.com/products/Dell-Inspiron-3650-PSU-Main-Power-24%252dPin-to-8%252dPin-Adapter-Ca...
https://www.youtube.com/watch?v=J81h1dHNwDk
https://www.youtube.com/watch?v=SCQTj1ei3Ew
speedstep
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September 4th, 2018 10:00
Its probably possible to get it working but its not plug and play nor is it Physically Possible to get a standard EPS12v power supply INSIDE the case. So the 3650 example is an Its ugly but it works.
My text is large all the time because its Hard for me to see when its smaller.
Its likely you need to modify the moddiy adapter to use 6 pins.
So the Pinout for the 6 is 2 Black wires which are Ground 2 White Wires which are 12v, One Green Wire which is PSON and one Grey Wire which is PWR Good.
Using power supply Outside the case with an adapter is possible. This is the UGLY MOD but it works.
https://www.moddiy.com/products/Dell-OptiPlex-3040-3050-3060-Main-Power-24-Pin-to-6-Pin-Adapter-Cabl...
CN-0DW3M7 240W Dell Inspiron 3668 Power Supply
speedstep
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November 3rd, 2019 12:00
Max upgR is low profile GT1030.
power supply mod is required
Moddiy has been tested and works fine.
There is even a guy who made his own adapter from scratch.
https://raphtec.wordpress.com/projects/dell-poweredge-t20-atx-power-supply-adapter/
https://www.moddiy.com/products/Dell-OptiPlex-3040-3050-3060-Main-Power-24-Pin-to-6-Pin-Adapter-Cable.html
kisianik
893 Posts
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September 3rd, 2018 11:00
Thanks SppedStep
Good catch regarding 6 pin MOBO PSU connector, I did not expect it and overlooked.
BentWookie
4 Posts
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September 5th, 2018 23:00
Don't mean to hijack the thread but I am in a similar boat. Got my kid a 3668 a couple years ago he's now ready to go for a 1060 or better. I was thinking of just buying a new case and PS but I saw that this has the odd 6 pin connector. Did you end up getting this to work? Anyone know if some sells a 24 to 6 pin adapter? Am I just better off getting a $50 mobo?
Thanks!
speedstep
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December 26th, 2018 10:00
There isn't any way for a 3668 to work with a 1060. There is no cookie cutter water chicken solution. EGPU might be the way to go but this too is experimental aka use PCI-E extension and external power supply and catch your house on fire jury rig electrical connections. AKA EXP GDC "The BEAST"
http://expgdc.net/pd.jsp?id=11#_pp=2_328
https://www.youtube.com/watch?v=2CU7fUZS9rQ
https://www.youtube.com/watch?v=GDyL2tPyXFA
The 3670 actually has that as an option with the 365W dell power supply.
Should be no problem however with a Low Profile GDDR5 GT 1030.
https://www.dell.com/en-us/work/shop/pny-geforce-gt-1030-graphics-card-2-gb-gddr5-low-profile/apd/a9763687/graphic-video-cards
dognmonkey
2 Posts
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June 20th, 2019 12:00
I got a DT 3668 for my daughter and she wanted to play games with better FPS. I got her a MSI GTX 1060, I have a BFG ATX PS 550W laying around, tried to convert 24pin to 6pin but it didn't work. The reason is Dell PSU uses standby 12V, ATX PSU has 5V standby, therefore none of these ATX PSU would work except the one that has 12V V standby.
I used a 12V relay, spliced the 12V from hard drive connector as inputs - outputs to pin Green (PSON) and Black (Ground). Connect the PCIE 6 pin 12V power to the graphic card and everything works perfectly. PC power on, external PS on, PC power Off, external PC Off.
https://www.youtube.com/watch?v=oyfTdKQtvIo
http://www.dognmonkey.com/techs/install-gtx-1060-to-dell-dt-3668-pc.html
Kadoo123
1 Message
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August 3rd, 2019 19:00
If you had bought a 24pin to 6pin adapter, would it work to connect the power supply to the motherboard? I saw this adapter on Ebay, after a couple researches cause I also have a Inspiron 3668.
adm1re
1 Message
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November 3rd, 2019 02:00
I am still confused. Is it possible to upgrade to, for example, a VGA Geforce GTX 1660 XC card given a external psu is installed? AND if so, is the EVGA Supernova 750 B1 the ONLY one that works? +Is a SSD installation possible, with a SATA cable?
CS_044
1 Message
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December 28th, 2019 13:00
I have an Inspiron 3668 i5 Desktop, I bought it originally to use as an office PC but the workload and gaming load I need wasn't satisfactory, so on the stock 240W PSU I am (safely) running an EVGA 4GB 1050ti (Small Single Fan) with an addition 8GB RAM, and the computer still works fine. And this has been running fine for the last 2 years.
GTX1050ti Single Fan is Safe for this system
takahsms327
3 Posts
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August 2nd, 2020 01:00
I've look for PSU upgraded products of Inspiron 3668. The default is 240 W PSU (L240AS-01). Now no PSU upgraded product is selled in the dell store. So I looked for it on Alibaba store. In AliExpress I find 460 W and 500W PSUs.
These Model numbers are L460EBM-00 (460 W) and LX500EM-02 (500 W) which are selled in shop name "Golden@Powerfull Store".
Caution: I do not check the compatibility with Inspiron 3668.
Please try to get the new PSU!
tonybrownt
8 Posts
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August 19th, 2020 10:00
I had exactly the same issue for exactly the same reason. I ended up putting in MSI NVIDIA GEFORCE GTX 1050Ti 4GT OC Graphics Card '4GB GDDR5, 1455MHz, DisplayPort, HDMI, DVI-D, Dual Fan Cooling System' as it was one that didnt require additional power from the PSU.
Now he's trying to play and stream at the same time the 1060 is maxed out so looking to upgrade to the 2060 but hitting more PSU problems (complications)
tonybrownt
8 Posts
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August 19th, 2020 10:00
That solution, the external PSU, looked great except it means removing the old psu (that looks hard for a PC newbie like me). Is it possible to use an additional external PSU just for the GPU (and the the old one in there powering everything else)?
May sound crazy but I really dont want to take all the cables out and I didnt understand the 6 pin 8 pin comment.
Basically we want to upgrade the Nvidia 1060 GPU (which doesnt need any additional PEG supplied power) with the Nvidia 2060. The PSU in the stock Dell Inspiron 3668 (I cant tell the wattage) but I suspect too low and anyhow there are no spare power leads from the PSU to plug into the GPU (I looked at a break out cable but decided first thing is to work out oif the PSU is upto it or if I can just add a new PSU for the GPU)
tonybrownt
8 Posts
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August 19th, 2020 10:00
Im struggling to get the Nvidia 2060 to work in this rig since there is no extra power supply from the PSU.
I read about replacing the PSU but that look complex (to me anyhow). Then I read about an external PSU, is it possible to use an external PSU just to power the PEG on the GPU (and the the old psu in place to run everything else)?
Bronislav
1 Message
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May 13th, 2022 05:00
it is possible to replace dell source PSU L240ES with H360EBN??