IC7/2.6A/1gb Geil PC4000/ ATX12V????

[chadomaly]

I have recently upgraded to the components listed in the subject, and this will be the first m/b I have owned that has an ATX12v connector (4 pin). Now that I am looking closer at everything, the PSU I ordered (Fortron FSP550-60PLN... due to Anandtech's recommendation of the brand), has an "EPS12v" connector, but no ATX12v connector. Here is what directron.com says about EPS12v:

What is EPS12V? EPS12V is a special, non-ATX standard adopted by the Server System Infrastructure (SSI) group to provide a more powerful and stable environment for critical server-based systems and applications. EPS12V equipment is not compatible with standard ATX or ATX12V PCs found in homes and offices. Power supplies built to the EPS12V standard include a 24-pin motherboard power connector and an 8-pin +12V connector. (Source: Antec)

I have two questions about this problem:

The pins are shaped differently, some with slanted corners some square. There ARE four pins on the EPS12v that will fit with the orientation of the ATX12v, but I would of course not stick it in there and risk frying the motherboard. This, though, would use 4/8 pins on the EPS12v. This is not so much a question as an observation.

My real question is this: is the ATX12v absolutely necessary on an IC7 with a 2.6a and a gig of ram? Is this ATX12v NECESSARY or just SUPPLEMENTAL power? Will the system run fine with a 550w psu without using the ATX12v?

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[WarCon]

I wouldn't run without it. If the engineers who made the board thought it was necessary it probably is.

I.E. The lans on the motherboard for the +12V rail from the main plug can't safely carry full juice. Its not a function of the powersupply as to why the plug is necessary, but how much current the lans on the motherboard can safely carry.