20 pin connector with 24 pin board?

[Brav]

My new setup is as described in my sig. Having problems, thing wont even turn on. It gets hot near the main mobo power connector. It came with a 24 pin recepticle, with pins 21 thru 24 taped over.. my PS has a 20 pin connector and fit fine into the other holes. is this incorrect? did I fry my board?

 

[mechBgon]

Did you read what your owner's manual says on that topic? I did, and they imply it "can" work with 20-pin. But yours doesn't. Let me back up and ask if your mobo is properly mounted on standoffs like in this photo?

 

[Brav]

Yep, have it mounted on the removable tray just like that. I get a split second of fan movement, then nothing. no monitor, fans, anything.

 

[mechBgon]

Another thing you might try is looking at the rear I/O panel to ensure that none of the springy contacts dropped into the network or USB jacks back there, and also unplug any of the case's front-USB or front-Firewire cabling as a fact-finding step (if there are such cables on that rig).

 

[Brav]

it all checked out alright. disconnected everything i could. I'll try a 24 pin adaptor, then a new PS i guess. then new mobo..

 

[flexy]

omg..i could write a lot regarding this...but i am kinda short tied/tired.

ok..you have a pci-e card. The 'missing' 4 pins of the ATX connector do exactly this: They provide the power for the pci-e slot !

Does your pci-e card have an additional/external power connector ?

How many amps does your PSU provide on the 12V /5V etc. rail ?

I think it is VERY likely that a dual rail (2x12V) powersupply with 24p might solve your problems...i still dont know what to think about boards who CLAIM that they are 20pin AND 24pin compatible....eg. say you can plug in both PSUs...but then on the other hand i say...well..there must be a reason for the 4 additional pins...

You also say it gets hot at the PSU mainboard connector. Thats exactly ONE problem, especially if you plan to get one of these 20p -> 24p adapters. (NOT REALLY RECOMMENDED !!!) See it like this:

You have a PSU with only one rail/pin on the motherboard for the +12V. (20 pin standard). If you use the adapter it splits the one pin up...resulting in twice the load/amps on the ONE wire coming from the CPU..and resulting in 4 times (!) the thermal strain (heat etc..) on the adapter/cable.

If you use the adapter you run the connectors out of specs ..worse even with high end cards which draw a lot of power and even worse if you overclock.

 

[flexy]

looked your PSU up...
>>>
Output: +5V@36A, +3.3V@28A, +12V@20A, -5V@0.5A, -12V@1A, +5VSB@2A
>>

20A on the 12V is pretty much borderline on the weak side....i can see that as a problem...i just dont know whether the P4 draws from the 12V too or from the 5V....all newer PSUs are usually strong on the 12V (eg. mine has 33A there) or provide 2x12V (eg one rail 16A, one rail 15A).

 

[Brav]

Originally posted by: flexy
looked your PSU up...
>>>
Output: +5V@36A, +3.3V@28A, +12V@20A, -5V@0.5A, -12V@1A, +5VSB@2A
>>

20A on the 12V is pretty much borderline on the weak side....i can see that as a problem...i just dont know whether the P4 draws from the 12V too or from the 5V....all newer PSUs are usually strong on the 12V (eg. mine has 33A there) or provide 2x12V (eg one rail 16A, one rail 15A).

Well then, sounds like thats my prob. I have an adaptor for the pci-e - two 4-pin molex into a 6pin molex for that also the regular +12v 4 pin square molex. How can I tell if a PS comes with a 24 pin?

 

[Peter]

The extra pins are there for a reason - exactly to provide more wires for certain highly loaded voltage rails, to reduce amperage across each power pin, and to prevent EXACTLY the problem of connector resistance and heating.

No, adapters won't help. It'll burn in the adapter then, not on the mainboard, but you just move the problem one plug further up.

Get an adequate power supply for what you're building. End of story.

 

[DAPUNISHER]

My weapon of choice It is in stock@newegg for a bit more

 

[tterris]

so besides the neopower 480 what are some good 24 pin pcie recommended ps's?

 

[jose]

Antec 550w EPS $112.50 has 36A on the +12V rail

OCZ 520 $139 has 33A on the +12V rail

Regards,
Jose

 

[PacFu]

you can tell with any psu that says "EPS"

 

[tterris]

the antec 550 eps will work on every new pcie amd mobo? under the specifications it says its compatible with motherboards of server system infrastructure (ssi). is that what the new n4 boards will be?

edit: it says its made for the dual xeon board.. does this mean it's not optimized for a normal 1 cpu mobo, and is it even compatible with an amd board?

 

[Brav]

well, i bought a new PS and that didnt work. had the correct 24 pin connector, even the 6 pin molex for pci-e. should have done that from the start, but i didnt know any better. so then i got a new mobo, and turned on. but i get no video.. im afraid either the first board got fried allong with the vid card, or i had a bad board,and i dont have something hooked up right.