Compuser10165 :
I have a bequiet Silentbase 800 and I am very please with it. However I sth remove the side panel to help cool my R9 390 when needed, and that is with and extra fan on top. This case cooling also seems to be limited to the fans being low static pressure. Altough it is silent, nonetheles. I consider the 900 as a bigger 800 with higher build quality (aluminium) but also a much higher price. I don't know if I would choose it in that price range.
I had a similar problem with my MSI R9 390 in my NZXT H440. The temps were reaching 90C. However, unlike your situation, I simply installed two top exhaust fans and then my temps lowered all the way down to 70C and fan RPM went down by 60%. I love this Be Quiet case despite its lack of effective cooling, as seen in the review, but I am having a lot of trouble deciding between two cases:
-Be QUiet Dark Base Pro 900
-Lian Li PC-O8WGN (
Link)
I love features that both have, but I am kind of attracted to how the Lian Li looks. Only thing that concerns me is the airflow in the Lian Li. There are three intake and exhaust, but the intake are all in the back by the HDD cages and PSU, and so are two exhaust. On the motherboard side of the case (since it is a cubical case it has two zones) it just has a single exhaust fan.
What I find strange, though, is that the CPU and GPU both got great temps on the overclockers' review: http://www.overclockers.com/lian-li-pc-o8-case-review/ but they actually had a radiator at the top and the fans were top
intake. So I don't know what to do at this point - Be Quiet or Lian Li. The Newegg promo on the Lian Li would let me get it for under $300 and it ends in two days! So I ought to decide by then.