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Dell Inspiron 3847 PSU upgrade
been looking to upgrade my 300 PSU to something stronger, such as the 450 watt unit i have left over from my old computer that died. I tried installing it, and everything fit well, but the computer refused to power up for more than a second, after reading up on some documents, I have seen many say the 24-pin connector is wired differently than standard ATX PSUs. will i be required to get a Dell-specific PSU with a higher wattage to make this work?
BlueCoyote
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August 16th, 2015 20:00
that is good information SpeedStep. did the CPU cooler that came ith the 4790k fit on the board without issues?
speedstep
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August 17th, 2015 16:00
I didn't try to use the plastic fitting Press on intel retail cooler. I replaced the thermal compound with arctic silver and put the stock cooler back on. It works fine. I chose the video card based on physical fit. Its an EVGA GeForce GTX 570 HD 1280 MB GDDR5
012-P3-1571-KR The card is 8.7 inches long and barely fits in but it does fit without modding the case and drive bays.
http://www.amazon.com/EVGA-GeForce-DisplayPort-Graphics-012-P3-1571-KR/dp/B004L9LT24
BlueCoyote
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August 17th, 2015 16:00
thanks for the info on the CPU, i did also find a couple of powerful GTX 900-series models that would fit in the space
ASUS GeForce GTX 960 GTX960-MOC-2GD5 2GB
and
GIGABYTE GeForce GTX 970 GV-N970IXOC-4GD 4GB 256-Bit GDDR5 PCI Express 3.0 HDCP Ready Video Card
speedstep
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August 17th, 2015 18:00
$300 for the 970 is more than I am willing to spend. The GTX570 was $100.
For what I need its good enough. Both those cards seem to be the short variety so if they are less than 9 inches long and the power connector goes in via the top then you are good to go.
speedstep
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September 28th, 2015 07:00
I disagree entirely. ATX 12V is a standard from the 80's and its NOT PFC. Only the case is still using the ATX 12V standard size. ATX 12V does not specify PFC or 15 to 20w +5vsb or 150 to 225w for the 3.3V 5v rails or 20 to 30 amps on the 5v rails specifically. 30 amps X 5V =150w
Dell has EPS12V and 80 Plus Certified power supplies for a reason.
http://www.plugloadsolutions.com/80PlusPowerSuppliesDetail.aspx?id=26&type=2
They have been getting up to 80 Plus Gold Rating on many units.
Relying on ATX 12V 20 pin power supply standard from 20 years ago ignores the
reality of the reason why the 3.3v and 5v rails are 145+ Watts and +5Vsb is 15 or 20 or more watts
and makes people think that a power supply is a single rail 12v unit and as long as its ATX and a single spec of WATTS means its going to be fine.
max faded
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October 10th, 2015 03:00
Sorry for reviving a semi old thread but does anyone think it would be alright if since I'm upgrading the psu on my 8700... could i put the 460w that came with it inside a i3847? I'm trying to figure out all the variables before i buy one (3847) ... I figure i could save some money and pop in a EVGA GTX 960 4GB SC Compact which the 460w should be enough for.
speedstep
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October 10th, 2015 12:00
The 2 Gig version is fine with the 460W. The 4 gig version may or may not work because it uses 3X 6 pin connectors aka an 8 pin and 6 pin. This is why EPS12V is required and the Corsair CS750M is the minimum recommended upgrade. Power supplies are not single rail 12v units that you can ignore the +5VSB, and the 25 to 30 AMPS on the +5v Rail, and the 20 to 30 amps on the 3.3v Rail etc. People who say ATX is fine are wrong and have no idea what the ATX spec says with max power on the 3.3v/5v rails 130w or LESS vs the EPS 12v spec with 150W or MORE as far as current and maximum power on each rail. The other reason for this specific unit is that it PHYSICALLY FITS.
http://www.microcenter.com/product/425477/CS_Series_CS750M_750_Watt_ATX_Modular_Power_Supply
http://www.amazon.com/Corsair-Series-Modular-Efficient-CS750M/dp/B00GH9NA0A
http://www.corsair.com/en-us/cs-series-modular-cs750m-750-watt-80-plus-gold-certified-psu
max faded
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October 10th, 2015 13:00
If those are the dimensions of the 3847 psu then it's the same size as the one in my 8700 I believe. The EVGA GTX 960 4gb SC compact has a 400w min req and only requires 1x 6pin. I think I'm going to go ahead and buy the i3847and turn it into a solid htpc... but with all the recent skylake upgrades I wonder if Dell plans on releasing an upgraded model... one know, one that isn't an AMD version.
speedstep
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December 23rd, 2015 08:00
Inaccurate and misleading is Disregarding the 3.3v/5v rail and the 5vSB rail. The 20 pin ATX Standard does not require 80 percent + PFC eficency or 150W on the 3.3v/5v Rails OR 3 to 4 AMPS 5vSB.
Dell has 150W max on the 3.3v/5v rail not 130 or 120 or 100w
Dell has 3 to 4 Amps aka 20W on the 5VSB rail not 2.5 or 2.0 amps which is all ATX calls for.
The 650M only has 130W on that rail set.