Markus, don't go for the Gigabyte one!
I just checked Amazon posts for it and some users complains for reboot in their pc after they installed that specific card!
I don't know if they had an early bios version of it, but it is better to stay away of troubles, and especially since that i was suggested this to you 
So i was taken a look at this MSI http://www.msi.com/product/graphi…o-specification and see only good posts.
The length of its PCB is 277mm, so check that will fit o.k. into your pc.
It has great core clock at 1,060 MHz (even more than Asus) as also memory at 6,100 MHz (again more than everyone else similar card!).
So maybe this baby is for you....
Take a look at this review here: http://www.overclockers.com/msi-r9-390-gam…eo-card-review/
Nikos.
Geplantes Grafikkarten-Update ATI
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I have this "instant-reboot-after-shutdown" problem already. Couldn't find a solution so far, never had a suspicion it could come from the gfx card.
Nonetheless, i can live with that because after shutdown i disconnect my hardware from the powerline anyway.
Who knows, maybe the Gigabyte cures it
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O.k. copy that.
But why not to try the MSI one? Don't be afraid, it is also a good brand! I had 3 cards by it in the past, good quality. At least the past years, now we have the damn economical crisis and everything goes down in the term of quality...
even the good stuff.
Nikos. -
As an example, 4 days ago i installed/seted up a nice small but strong pc with motherboard from Gigabyte (like always in my life, and NEVER from Asus!!!).
After 2 days of use, the board died...
First time in my 23 years of set/install pc's life to see a Gigabyte motherboard to die so quick!
The board was the GA-H81M-S2PV rev. 3.0.
Nikos.