The brands don't matter as long as the card is the same model, it can even have aftermarket parts on it, as long as the models of the cards are the same, don't know much about msi so I can't really tell you if they are good or bad, but since the MSI has an aftermarket cooler already installed I suggest the top since the top card runs hotter, also I would recommend another EVGA since the warranty and customer service is just to great

wdflyer

Why the MSI?, the clocks are  750 / 1500  vs the EVGAs 850 / 1700.

You can SLI the two together, but why not just get another EVGA of the same model.

SLI'ing these two cards will bring down the EVGA clocks to the MSI's speeds....

From what I can remember Nvidia solved that downclocking problem with the 400 series(Er sorry with the newer drivers that came out with the 400 series), so you can have two flavor's of cards and not have to worry about the good flavor going sour.

I meant you can have a 570 SC paired with a regular clocked 570 and the SC will not downclock.

Umm, I don't see why any of that would even matter.  A GTX 570 is the same exact card as a GTX 570 SC, just a factory OC and a different box, lol.  I can easily OC the Twin Frozr to the the same specs as my current GTX 570 SC, I would actually imagine higher because the temps would be a lot lower.
 
I am considering getting the MSI TF because of the cool aftermarket cooler.  Especially considering I could put it in my first PCI-E slot and lower the temps quite a bit.  The EVGA GTX 570 SC I have now isn't that great.  I don't mean there is anything wrong with it, I'm just saying I had to push to get to 850/1700/2000.  It will barely run 3DMark 11 at those settings on 1063mV.  I have seem some people get their vanilla EVGA GTX 570's to 900 core before hitting 1000mV.  So actually my card is probably about average if not a little below average.
 
 
EDIT: Just to clarify, the EVGA GTX 570 SC isn't stock at 850/1700/2000, I OCed.  It comes set at 797/1594/1950.  I would probably reset the EVGA to default and just OC my Twin Frozr to 797/1594/1950 so they were the same.

037leo@gmail.com

i have both a sc and a vanilla (they were gifts so can't be picky) running at two different speed and they work fine

http://forums.evga.com/tm.aspx?m=757198&high=two+different+570

 
Yea I'm sure it works fine.  Didn't you just OC the vanilla to the SC card?  If not can I ask why?  They really are identical cards, one just costs $30 more, lol.

Sounds good.  I really do love EVGA, but I am just wondering which one do you think is better for SLI.  I know two different brands will really make no difference.  I was thinking that maybe the two EVGA 570's might be kinda tight on my board with little room to breathe.  While the open air design and dual fans on the MSI TF might give the top card better air flow.
 
Thanks guys
 
Andy

I think the MSI looks kind of "cheap" I much prefer the EVGA cooler.  That, and the MSI logo on the flow bracket is extremely restrictive with so much metal there.