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.
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.
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.
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.
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.
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.