Inspiron 5675 Gaming Power Supply

20 pin 70 percent efficient ATX is not working.   80 percent Efficient EPS12V  2.91 is required.   ATX is a standard from 1990. No idea on this new model if they use proprietary power connections.  Visually it does not appear to be anything other than standard 24 pin / 4 pin EPS12v 2.91 (This system DOES NOT have 2 video slots.)

http://downloads.dell.com/manuals/all-products/esuprt_desktop/esuprt_inspiron_desktop/inspiron-5675-gaming-desktop_service%20manual_en-us.pdf

Power supplies are not a single rail with a single spec of Watts.

Units that have AT LEAST 25 AMPS on each of the 3.3v and 5v rails as well as 150W combined on those rails are a minimum.

This is why an EVGA 750B1 works fine in most all dells that it physically fits but the B2 and BQ models of the same 750w do not.

EVGA SuperNOVA 750 B1 110-B1-0750-VR

https://www.newegg.com/Product/Product.aspx?Item=N82E16817438025

Thanks for the information.  My board looks identical but does have the 2 video slots unlike the one pictured.  

I bought this m.newegg.com/.../N82E16817151188

It on shows 20 amps not 25 like you said.  However, surely it's good enough yes?  Just sharing to confirm because I already bought it.  Otherwise, I'll look at what you recommend.

Thanks.

It may be ok but just based on the SPEC for the Combined on 3.3v/5v rails there is a problem.  Even on the 460W units the COMBINED 3.3v and 5v rating is 142W. And the 5v says 25A

This is why I say ATX is not ok and EPS12v 2.9 is required.

http://www.smps.us/EPS12V_Spec2_92.pdf

Power supplies are NOT a single rating of WATTS and only 1 Rail.

The EPS12v 2.92 spec specifically INCREASES the watts on the 3.3v 5v railset.  The problem with not meeting the spec is that it may not work.  They Also DO NOT SAY EPS12v or the version of ATX-12v

Only ATX12v version 2.4 comes close.  What do you think will happen if it tries to draw more than 100W from the 3.3v /5v rails?

20 A at 5v = 100W   You do not get to draw the max on all rails all the time hense the COMBINED Rating.

https://seasonic.com/product/focus-plus-850-gold/

The Dell 875W unit has 225W combined on the 3.3v and 5v Rails.

With 32A on the 5V and 30A on the 3.3v

EVEN the 305W units have 150W combined on the 3.3v/5v Rails.

22A on the 5v rails.

Very good info.  Thanks for the explanations wish I would have seen your response prior to ordering that seasonic.  I'm confused by how good a reputation seasonic has, but yet the numbers on the labels clearly favor the Dell power supplies.  

I don't know that the seasonic won't work.  It might be fine.  But if you have issues with freezing and lockups and reboots or worse it doesn't work at all then I would say the other rails maximum combined power is the issue. The EVGA Super Nova 750B1 has been used and tested successfully in many dells including XPS 8500 and XPS 8700 and works fine in my XPS 8900.

This is also why

CORSAIR CS750M works   CORSAIR CX750 DOES NOT

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139061

This is what the NEX 750B1 looks like installed in an XPS 8500

And if it's ATX 2.4/EPS12V 2.92 should I go for that over the 2.91, or should i go for the 2.92? I did notice this on best buy.com, it's a CX650M but it has EPS12V 2.92 listed, in this case would a CS be better? www.bestbuy.com/.../5845214.p

Also i scoured amazon and found this, the 2017 revision to the CX750, and it includes support for EPS12V 2.92, I know it's not modular, nor semi modular, but that's okay for a $20-25 dollar trade off, leaving room to get more ram, right?  www.amazon.com/.../ref=dp_ob_title_ce

So would the CS650M work? or would it be better to pay 5 bucks more for the 100w overhead? www.newegg.com/.../Product.aspx

So would the CS650M work?

You haven't really said what you are trying to do.   Do you need 850W?

You said you bought a new 5675, and were thinking of adding a second graphics card.

Which card? What is in there now? 

 I'll be candid, I am not a fan of the current crop of Corsair PSUs and you have to look closely at each model to see what is really inside. Keep in mind that Corsair does not build power supplies, they contract out to have them built by different companies and there is a great amount of variability between the different models.

My opinion is that if you really need an 850W PSU, you should look at a top-tier unit like a Seasonic Prime Titanium or an EVGA P2 ( built by Superflower) or the Gold equivalents like the Prime Gold or EVGA Supernova G3.

 If you really need that much power you'll want it not only to be efficient ( which means less heat and less electricity cost) you want it quiet and stable.

But back to the first question, what graphics card are you adding that needs 850 watts ?

The CX750 Cannot support 2.92 BECAUSE the Combined Power on the 3.3v/5v rails is not even 150W let alone 170W.

You cant have max current on all rails and eat your cake too.

On the Dell 875W units this rating goes UP to 225W.  Power supplies are not a single rail with a single specification of WATTS.  On Dell 460W units the combined output is rated at 142W.  The PCI-E slot uses the 3.3v rails for power.  Dell 305W units also have 150W combined on the 3.3v/5v rails. And 22A on the 5v Rail.

This is the Rating on the 750B1

https://www.evga.com/Products/Product.aspx?pn=110-B1-0750-VR

On the CX500 series the same Issue is at play and 5V max is 20A not 25A  The other issue of course is that 5v @ 25A =125W which leaves 5w for the 3.3v rail.

EPS 12v revisions.

And if it's ATX 2.4/EPS12V 2.92 should I go for that over the 2.91, or should i go for the 2.92?

I would not focus on the EPS12V spec, because it is not relevant to a desktop system, it is a server specification.

The Seasonic Focus 850 Gold will work fine in this system, but it still isn't clear to me what you need 850 watts for?

Are you adding a second RX 580? 

I disagree :emotion-3: the spec on the Focus 850 does not list sufficient power.  EPS12V is referenced because of the reasoning behind making the 3.3v/5v Rails MORE not Less than 150W.  On the Dell 875W unit this goes UP to 225W.  32A on the 5v rails and 25A on the 460W.  These are not Trivial Values.  Hard Disk Drives are using +5V and +12V rail and USB2 are also using the +5V rail at 2.5W per port  5w per usb 3 port and 25W per USB 3.1 if charging a device over USB.

http://www.adexelec.com/pex16ixbman.pdf

https://seasonic.com/product/focus-plus-850-gold/

Speedstep, you are absolutely right with everything you say, but it is a collection of mis-information that does not apply.

EPS12V v2.92 is not needed, and does not apply to the Inspiron 5675.

www.smps.us/EPS12V_Spec2_92.pdf

EPS12V Power Supply Design Guide

A Server System Infrastructure (SSI) Specification For Entry Chassis Power Supplies Version 2.92

The Inspiron is not a server. The case holds two hard drives. They might draw 10 watts each if they are old high performance drives, more likely 6 watts for a new power efficient drive. There is a single optical bay. A Blu-Ray when burning might draw 30 watts. So there is maybe 50 watts of power needs from the 5V and 3.3V rails. The SSDs might need a little more.

If the system was a server ( or a full tower workstation) that could hold 8 drives in RAID, then maybe one would want more power on the lesser rails, but that is not what an Inspiron 5675 is or will ever be.

And, also every dell PSU you list fails to meet the EPS spec. EPS 8 pin CPU connection, and the PSUs only supply a 4 pin ATX 12V CPU power cable.  The Dell Motherboards only use a 4 pin CPU connector so again the current ATX 12V connector is fine.

Also, the other half truth you keep repeating is how old the ATX spec is.  Yes it is old, but it has been revised several times.  the often cited ATX12V specification has had multiple revisions, the last in April of 2013 and is detailed in the document below.

https://www.intel.com/content/***/www/public/us/en/documents/guides/power-supply-design-guide.pdf.

version "ATX12V version 2.4" specs live inside version 1.31 of the document listed above, and no-where are the requirements for 150 watts on any combined rail. 

Why? Because this is a desktop specification and there is no requirement to over-build a power supply for a rail that is not to be used. 

So please stop the long misleading posts with pictures and arrows suggesting everyone needs EPS12V v2.92 as it simply is not correct.

Please read up on current power supply needs and modern board design rather than rehashing the same thing over and over.

The power requirements on those rails go up for more than 2 reasons.

The modern AREA 51  1500w POWER SUPPLY 800GY   80 PLUS GOLD power supply has 180w on the 3.3v/5v combined rails. Lists 25A on the 5v Rail and 20A on the 3.3v Rail.

1 USB3 ports use 5W per port or more up to 25W for USB 3.1   USB2 is 2.5W aka 500ma.  

3.3v is used directly in the 75W for an X16 slot.  75W on 3.3v rails is 22 AMPS .

6 usb ports at 5v  is 30W.  Thunderbolt  USB 3.1 charging is 25W.  Other ports use 5v power such as Display port and HDMI and the SATA power connections.  There are numerous posts where people replace a 305W or 460W or 525W or 850W power supply with a "Bigger" unit based on ONLY the 12V rails and Watts.  And the result is they DO NOT WORK and or They turn on but crash and reboot or have problems waking from sleep.  If there was no need for 3.3v anywhere on the board then the 24 Pin connector would not need 3.3v pins.  Red wires are 5V  orange Wires are 3.3v  Yellow Wires are 12v.   There is only 1 voltage removed over the past 20 years which is the -5v white wire which is now NC as in not connected. Therefore your reference to "modern" is meaningless.

It was never stated as a requirement only a rationale based on engineering specifications  for combined power output.   The same 142W or more is listed as a spec on DELL power supplies.   You wont find that value going down to 130W or 100W or 90W on ANY dell power supply for the 3.3v/5v Rails nor will you see the +5vsb being lower and lower with larger and larger power supplies for the same reason.  3A is minimum.  4A is common and on the larger units its 6A.

http://pcisig.com/specifications/pciexpress/technical_library