Need help deciding on New GPU

edited January 2014 in Hardware support

I'm fixing to buy 2 new cards.

Which would be a better choice
2x Refurbished SAPPHIRE Vapor-X Radeon HD 7970's or
SAPPHIRE DUAL-X Radeon R9 280X's

Both cards are the same price and from what I've read the 280x cards are a re-brand of the 7970's, is there any other difference besides the name? Is one model better then the other?

I'm tired of messing with the under-performing XFX 280x card I have and will be putting that in another computer that has a failing Nvidia card, and from what I've been reading Sapphire cards are what I should be buying to get the 700+ KH/s hash rate per GPU in this line of cards.

I just want to make sure which will be better before I drop $800+ on new cards.

Also when running 2 cards since it's not in crossfire to do the mining I'm guessing, do I need to make or buy a dummy plug for the second card?

Thanks in advance,


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