Then I started the installation in my case, some pics
Finally, some fun with Furmark in the closed case (Two front fans between 300-550 rpm, one top fan and one back fan also around 300-550 rpm, cpu fan is acutally practically idle around 250 rpm). All fans are voltage controlled Scythe Slipstreams 120 x 120 mm.
As visible card temperatures seem to stabilize around 70 °C, more than fine enough for me.
So now for the fun:
The system is a Intel DP67BG Mainboard (Intel P67) with PCIE 2.0, Sandy Bridge Core i5-2500, 8 GB RAM. The graphics card itself is a PCIE 3.0 variant obviously. OSes are Kubuntu 13.10 and Windows 7 in a dual boot system. Main Bootloader is Grub 2. The fun thing is, that with this card the Grub bootloader is not shown (DVI output). What I see is just a black screen with one of the last POST codes in the lower right (which is principally normal before entering the boot loader). Initially, I thought the system would hang, but after some wait time it automatically booted into Kubuntu, however it seemed I could not enter Windows, even when setting the default boot loader value to the Windows system. I am still not sure how I got it "working", but it turns out that it takes around 70 seconds till the bootloaders seem to decide that enough is enough and boots Windows (btw I also cannot see the windows boot manager). All of this is really weird, as the timeouts are 5, respectively 2 seconds for the two (invisible) boot-loaders. I actually think, that the system hangs within GRUB, but can obviously not prove this. What I know is that the grub bootloader is present 5 seconds after the last post code change, because you can make grub beep as I learned. I can also change entries blindly and boot into Kubuntu, but still have some weird delay also for this boot option.
So, that is basically it... question is: Incompatibility issues between (rather old) Mobo and card? What else? Any insight would be appreciated! I'd really like to SEE my bootloaders.
After booting, everything seems fine however.