Require a little help here.

[SolidSnake]

This post explains the difference between reference design and OEM design cards, and how to tell the difference: http://hashcat.net/forum/thread-3949-pos...l#pid22844

The 7970 & 7950 are last-gen cards from 2012 so yes, I imagine you would have a hard time finding some new. But you can likely find good used ones on eBay.

Yes I have read your post about it already. Seems like getting used cards from Ebay is among the only solutions to get them. But the problem is that theres always a risk from getting used stuff from ebay and also will probably not even be able to find x4 of the same.

When you say "Always buy reference design cards. Period. " does it mean if I get non-reference design it might not work for password cracking or can overheat quickly and die?

Also what about getting 4x Nvidia GTX 750Ti. Do you think it can still make some decent cracking?

Is there any other non-reference cards that will work multi gpu that you can suggest to me?

Thanks thanks