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20 pin or 24 pin?

post #1 of 6
Thread Starter 
The user manual of my ASRock Z77 Extreme 4 reads:
Quote:
Though this motherboard provides 24-pin ATX power connector,
it can still work if you adopt a traditional 20-pin ATX power supply.

So if it can work w/out the 4 extra pins, why connect them?

My PSU is a Coolermaster Silent Pro M700, and it comes with a 20-pin connecter + a 4-pin connector to make it a 24-pin connector, but it just barely reaches, and the extra 4-pin connector pulls on the motherboard connection when connected, and I am considering going without the 4 extra pins, what do I lose by doing this?

Also on a related note, with regards to the the ATX 8-pin 12V connector on my board, the manual says:
Quote:
Though this motherboard provides 8-pin ATX 12V power connector, it can still work
if you adopt a traditional 4-pin ATX 12V power supply.

Luckily the two 4-pin connectors that run from my PSU to the connector has plenty of room, so I have no problem connecting both of them, but again, why make it an option?
-BassKozz
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post #2 of 6
Newer motherboards need more juice for components as well as headroom for overclocking - if you don't plug in the extra four pins I wouldn't overclock.

Same thing goes with the 8 pin - if you're only going to plug 4 in then I wouldn't overclock.
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post #3 of 6
Basically, as power demands have increased, the number of wires/cables used has increased as well. TThe increase in motherboard onboard components also necessitates more power delivery.

The biggest reason though is that the greater the number of wires carrying a current, the lesser the load on each wire (or connector).

It's also helpful for reducing voltage fluctuations. I personally always plug in all available power connectors, even when they are not strictly necessary (such as the two EZ-PLUG power connectors on my RIVE, one of which is an extra dedicated line for the memory, and the other delivers more power to the PCI-E slots).

Basically, you should never have any issue with all the connectors plugged in, but it is absolutely possible that you will have trouble if you only provide the absolute minimum of wire.
   
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post #4 of 6
I'll comment again because I didn't mention it before, but why don't you get a 24pin extension? There are plenty out there for dirt cheap if you're on a budget and there are some more fancy ones for people who want their rig to look good.

http://www.performance-pcs.com/catalog/index.php?main_page=product_info&products_id=2512
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post #5 of 6
Quote:
Originally Posted by xyexz View Post

I'll comment again because I didn't mention it before, but why don't you get a 24pin extension? There are plenty out there for dirt cheap if you're on a budget and there are some more fancy ones for people who want their rig to look good.

http://www.performance-pcs.com/catalog/index.php?main_page=product_info&products_id=2512

Buying a cheap crappy extension cable could kill parts not long a ago someone here on OCN killed his video card with a cheap crappy extension cable

Bitfenix extension cables seems to be the best
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post #6 of 6
Thread Starter 
Thank you all for the great feedback, It turns out I wasn't installing the 4-pin plug first then the 20-pin connector, and this is what caused it to look like there wasn't enough slack, and it was loose because the 4-pin connector had tabs to lock it in underneath the 20-pin connector...

So I now have all 24-pins connected.
Moral of the story, look closely at the connectors before ass-u-me'ing
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