24-pin mobos and new PSUs

[archcommus]

I will be upgrading to an nF4 system soon and I read over the "Do I need a 24-pin PSU?" thread. So is the only difference between the old and new PSUs the extra four pins and haivng two 12V lines instead of just one? But some of the regular ATX PSUs on Newegg have 24 pins on the conenctor, I'm confused.

 

[archcommus]

Bump!

 

[NotquiteanooB]

Maybe this link could shed some info on why. "most dual processor boards require 24 pin; and maybe that means hyper-threading processors as well" ??
http://www.techreport.com/reviews/2004q4/psus/index.x?pg=1

 

[archcommus]

But what *is* a 24-pin, or ATX 2.0, PSU exactly? How can you differentiate between the two on Newegg besides counting the pins in the picture?

 

[Promethply]

All ATX2.0 PSUs, such as the Antec TruepowerII have 24pin ATX plug, AFAIK.

 

[BlingBlingArsch]

dem girl is riight. and she loves the earth as i can see from her signature...good now back to topic. ATX is a wide spread standard not a law though so manufacturers often dont care bout every detail of that standard, which is one more reason to avoid very cheap PSUs.
Concerning ATX 2.0 there are a number of changes included altough the new connector seems to be the most obvious difference to buyers, but the invincible changes are even more important imo...like:
More power on the 12V rail. Splitting the 12V rail into two rails if its stronger than 18A. The 2x2 plug takes the second rail indepependently (man, my english sucks.)
At least 70% Efficiency at typical Use (>= 50%), at least 50% Effizienz at low Use (~ 20%)
The 20pin mainconnecter is replaced by a mainconnector with 24pins, this change is only to guarante that theres allways at least 75W for PCI-Express.

These powerconnectors are specified with ATX 2.0:
the 2x12pin connector how it should be named correctly...its the 24pin connector.
the two wellknown Molex-Connectors for Floppy and Periphery, the Aux-Power +12 V (2x2 Pin) and the Serial-ATA-powerconnector. Sometimes u will find a 6-pin Power Connector, which is made for very "powerhungry" PCI-Express-Graphiccards. Though the ATX 2.0 papers mention this connector it doesnt get specified any further and manufacturers may not build it into every PSU.

dont believe my words? try to prove me wrong...http://www.formfactors.org/developer%5Cspecs%5Catx2_2.pdf

 

[BlingBlingArsch]

forgot mentioning that those efficency or is it effectivity? standards make the PSU less power demandin, when i changed me PSU it would need like 30W less, which is good for ur electricity bills. love the earth as the girl said...

 

[archcommus]

And how can you differentiate between ATX and ATX 2.0 on Newegg? I don't see any PSUs that specifically say "ATX 2.0".

 

[BlingBlingArsch]

look for the 24pin connector, not the 20->24 adapter and for: "two seperate 12V rails" and for the Aux-Power +12 V (2x2 Pin) connector (this one is more for server use). These things should indicate its ATX 2.0

 

[Puffnstuff]

If you look at the specs you'll see atx 2 as 24pin is part of the atx 2 spec. My ps is atx 2 and I got it at newegg as is the ps on my other nf4 system which also came from the egg.

 

[musgrattios]

On newegg, their "ATX 2.0" is ATX 12v, or something w/12. Many PSUs have the extra 4 pins as an optional thing- they come with it, but it can be taken off. I just had to get a PSU and was looking sooooo hard for ATX 2.0 lol... and more lol.

 

[Algere]

Some old PSUs have 4P CPU connectors (so that's not new) & the difference between newer & older PSUs in general is the spec change between ATX12V 1.x & 2.x

Off the top of my head the changes are...

1) 24P ATX connector
2) More than one +12V rail if PSU has >18A & compliance to UL's 240VA safety standard
3) Higher efficiency
4) Within +/- 5% voltage regulation
5) SATA connectors
6) -5V line removed
7) Aux connector removed, don't remember for sure but I think it's labeled/called the P6 connector.

 

[Algere]

Originally posted by: BlingBlingArsch
dem girl is riight. and she loves the earth as i can see from her signature...good now back to topic. ATX is a wide spread standard not a law though so manufacturers often dont care.....

dont believe my words? try to prove me wrong...http://www.formfactors.org/developer%5Cspecs%5Catx2_2.pdf

It's ATX12V 2.0, not ATX 2.0

 

[imported_Kensai]

Originally posted by: Algere
Some old PSUs have 4P CPU connectors (so that's not new) & the difference between newer & older PSUs in general is the spec change between ATX12V 1.x & 2.x

Off the top of my head the changes are...

1) 24P ATX connector
2) More than one +12V rail if PSU has >18A & compliance to UL's 240VA safety standard
3) Higher efficiency
4) Within +/- 5% voltage regulation
5) SATA connectors
6) -5V line removed
7) Aux connector removed, don't remember for sure but I think it's labeled/called the P6 connector.

Actually, the ATX 2.0 spec *dictates* that you *must* have two seperate 12V rails. The 6 pin aux is removed. Tehre is a 6pin PCI-E connector that you must have also.

 

[BlingBlingArsch]

obviously u didnt read my first post...nobody "dictates", no "must have" 6pin pcie! :-/

 

[Algere]

Originally posted by: Kensai

Originally posted by: Algere
Some old PSUs have 4P CPU connectors (so that's not new) & the difference between newer & older PSUs in general is the spec change between ATX12V 1.x & 2.x

Off the top of my head the changes are...

1) 24P ATX connector
2) More than one +12V rail if PSU has >18A & compliance to UL's 240VA safety standard
3) Higher efficiency
4) Within +/- 5% voltage regulation
5) SATA connectors
6) -5V line removed
7) Aux connector removed, don't remember for sure but I think it's labeled/called the P6 connector.

Actually, the ATX 2.0 spec *dictates* that you *must* have two seperate 12V rails. The 6 pin aux is removed. Tehre is a 6pin PCI-E connector that you must have also.

If by dictate, do you mean that ATX 2.x refers (in general) to ATX12V 2.x? AFAIK seperate +12V rails aren't specifically mentioned under ATX 2.x spec.

6P PCIe is also not listed under spec (ATX 2.x & ATX12V 2.x) & dual rails are "suggested" under ATX12V 2.x but OTOH ATX12V 2.x does also say PSUs must comply to UL 240VA standard (20A/rail).

Originally posted by: BlingBlingArsch
obviously u didnt read my first post...nobody "dictates", no "must have" 6pin pcie! :-/

QFT

 

[archcommus]

So basically, anything that says ATX12V on Newegg is the new type, and anything that says ATX is the old type? But that must mean that even some regular ATX PSUs have 24 pin connectors, because there are some on there. Why?

I just can't decide if my Antec SmartPower 400W will be decent for my new system, or if my video card will pretty much need the separate 12V rails and the extra four pins on the mobo connector.

 

[Promethply]

The 24-pin PSU would state that it's ATX12V 2.01 compliant.

Your Antec SmartPower 400W seems to have a max load of only 18A on the 12V rail means

that as long as you're not running an SLI system with an Athlon64 FX55 CPU, then you'll be OK,

but otherwise, that PSU won't suffice.

 

[archcommus]

So I'm guessing my current SmartPower is 20 pins? And it would be alright to leave the extra four empty on the new motherboard?

I will be running an X800 XL PCI-E and an A64 3200+. Does that X800 have an extra power connector or does it get all it needs from the PCI-E slot? If it's the latter, I hope the slot would deliver enough power.

 

[Promethply]

Yes, you can safely connect the PSU's 20-pin ATX plug to the mobo's 24-pin EATX connector.

On the second point. Google's your mate, but even then you can always get a cable plug converter from your local

computer parts retailers.

 

[archcommus]

In my situation would you spring for the new PSU to be safe or give it a go with my current one?

 

[Promethply]

Your current PSU will serve your new system just fine,

unless you OC your CPU to the max, and install 4 HDs + 2 Optical Drives, plus fill up all your RAM slots, etc, etc.

 

[archcommus]

Okay good, so I'm hoping that X800 XL doesn't even need any external power. And if it doesn't, well I hope my PCI-E slot even with a 20-pin PSU will deliver enough juice.