Originally Posted by OCPG
Did you turn up the GPU's own fan? What was the GPU temp? I'm a little skeptical as others have claimed to be fine with fans such as the included silverstone 15mm fans.
I have a R9 290 so temperatures are a real problem even though I have a Twin Frozr cooler on it. I currently have 1 F12 and 1 S12A installed under the GPU and there are about 4mm space between the GPU and the fans. Originally I had 2 S12As and was finally able to run without throttling when changing one for the more powerful F12. It makes more noise but it is more optimized for heatsinks and radiators (read: operation in tight spaces like the RVZ01) and gives more pressure so it manages to keep the GPU cooler.
At baseclock with the fans turned to 100% the temps even out at about 87C, with the GPU fan running at 80% during Unigine Valley. I'd much rather have the Noctuas running 100% than the Twin Frozr because they are much quieter and less hair driery. I'm running the case inside a TV bench and the temperatures drop by about 10C when taken out and put vertically. It's much more quiet then too. I have 1cm of coasters under the case in horizontal mode to allow more airflow for the GPU fans. It's much more quiet then too.
I personally am probably going to toss the Twin Frozr altogether for a bigger heatsink (Alpenföhn Peter 2) and use the intake fans practically as GPU fans, because it is probably not efficient having two fans running close to 100% on top of each other. I hope I had the guts to make a DIY watercooling for the case but can't trust myself not screwing up the installation in such a tight case.
You're probably okay when running a cooler card than the 290/290X and the stock fans will probably suffice, but when wanting optimal performance I'd stick with the F12.