Help with CrossfireX optimization?

skiunitkid

Distinguished
Aug 16, 2011
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I built a PC a couple years back, and I have some speculations and questions about it. First off, here are my specs:
ASRock 970 Extreme4 (NOTE: Advertised as Crossfire compatible)
AMD Phenom II X6 1090T Black Edition
XFX HD-687A-ZNFC 1gb
XFX HD-687X-CNFC 2gb (Main Card)
So I installed the second listed card a couple months ago, and I have noticed no significant performance boosts, and possibly even a detraction. I was wondering if there were any ways I could optimize my setup with the cards so I can get better performance, or if I have to run it on one card.