MSI K8N Neo4 Platinum SLI sound needs -5V; newest Antec 550W has no -5V rail

I came within a whisker of ordering a non-returnable  3700 Venice, MSI K8N Neo4 Platinum SLI mobo and an upgraded Power Supply, Antec's newest 550W PS the TP2-550 EPS12V ($117).  This has dual 2x24pin 12V 19A rails and is touted as the new V2.0 EPS12V/ATX12v compatible power supply for high performance SLI systems.  By accident I came across a page at MSI for this mobo
http://www.msi.com.tw/program/products/mai...ail.php?UID=641
At the end is this warning:  MSI Reminds You...
• For this model, you must use a Power Supply which has a -5V pin supply. Also, the users manual which I downloaded on Pg 2-10 says the same thing
The above Antec PS specs do not  show a -5V rail, nor does an Enermax 600W I looked at.  The V2.0 specs for ATX12v which added 2x24pin 12V rails dropped -5V rail from the spec and it appears MSI is not conforming to the spec (See Antec response at end) None of the web sites selling these PS & mobos contain any warning.  I vaguely recall from a forum a while back it may have something to do with the Soundblaster system in the mobo.
http://www.antec.com/us/productDetails.php?ProdID=22551 (click specifications)
Isn't this a major showstopper which is going to cause a lot of grief for those of us upgrading to SLI systems using this mobo and upgrading our PS to the newest & best power design?  We won't know the PS won't work until we build the system.
Regards, Ron
Antec reply to me:
>>>>Thanks for the link. Since MSI's website does state the motherboard needs the -5v, the True550EPS12V will not work with this motherboard. The Standard (http://enhanceusa.com/documents/atx12v_v2.01.pdf) has removed the use for the -5v rail and it is no longer needed. MSI has not manufactured that motherboard to the Standard. Finding an ATX12V v2.0 power supply with the -5v might be hard to find. You should contact MSI for a compatibility list of power supplys that were tested to work with the K8N SLI Platinum.

Quote from: ccve3 on 21-May-05, 07:27:40
Wow!!  syar2003 thanks for that post.  I've spend an hour going through it &  fasteddies links.  Now I are a power expert.  The dual rail argument is enough for me to go back to the MSI K8N Neo4 Platinum SLI with one of the single rail PS -5V units listed by fasteddie. The only question left now refers to computerpro3  recommendation on ultra power supplies for SLI 
>>I quite simply wouldn't dream of putting anything else in my machine. Keep in mind, this section is for 2x 6800 models, not the 6600's which most any good psu will handle (like Antec Neopower, ocz 520, etc). . Pc Power and Cooling 510 Deluxe SLI edition (refer to list)
2. Zippy/Emacs 550-700w models
3. OCZ 600w (personally I would get the pcp&c for the price, but it's been proven here, so I'll be fair...). 
These are really high end, expensive and only 3-4 choices. Since I'm getting one 6800GT and eventually another & possibly eventually a 4800 X2, I was hoping the OCZ 520W would do it but computerpro3 says Powermaster 520 isn't good enough for SLI.  I found that there is an OCZ 600W ATX12 dual rail which surprisingly has a -5V rail needed for K8N Neo4 SLI Soundblaster.  Will this meet computerpro3's preference for a high end PS for SLI systems even though I'm losing the 1 rail advantage.  Maybe the 600 Watts just overwhelms the 1 rail/2 rail question.
Thanks again for the teriffic help
Regards, Ron
Wondering what you settled on.  I got the Antec TP550 and it's flawless on the board.  I even have the older 20pin model which works perfectly (including sound).  If you really wanted what I would consider to be a top dog (pcpower and cooling), and find the -5v rail missing, all you have to do is place a phone order and request they add a -5v rail.  It's a minimal cost and a total solution for having everything.  Just my $0.02

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