The Arctic website actually does show that the MC001 has an integrated TV tuner, no fan and uses a super thin HTPC case
. Is there anybody who thinks that it would be a reasonable assumption that this can be done with an FC10 case ? ?
I'd guess this depends on just how hot your particular TV tuner card runs, and whether it's situated in the case in such a way that the heat can rise away the card unimpeded. You mention wanting to have 2-3 cards in total; this would not be possible with the FC10 -- you can only fit 2 add-on cards, arranged horizontally. Look at the pics of the back panel.
I have no personal experience with TV tuner cards or how hot they run, but I do have lots of experience assembling HTPC systems. I can tell you w/o any doubt that the need for them to be silent (ie -- fanless) is dubious unless it needs to be left on next to you while you sleep. Several facts:
1. when it's actually working (ie, TV on, sound on), even a moderately noisy HTPC often gets drowned out by what you're watching/listening.
2. it's easy to make an extremely quiet HTPC that is well cooled with multiple low speed fans that will never be heard in actual use.
3. I currently have a i5 Ivy Bridge dualcore HTPC in my living room that runs all the time (sleep mode turned off) and no one can ever hear it. It measures <15 dBA at 1m at all times. I just used a Noctua NH-L9i Low Profile CPU Cooler and let its fan be controlled by the motherboard BIOS "quiet" mode setting. I'm sure I could add another fan (80~120mm running up to 10000rpm for case exhaust) without suffering any significant noise increase.
So, going back to your situation, if there's some question about whether some components are going to be too hot for passive cooling, my approach would be to go for a case that allows good air cooling and manage the fan speeds so they never intrude.