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I don't know the exact CPU cooler height limit of S4, but If you mean as restrictive as less than 30mm tall for instance, then I can't think of 30+ options (unless there are bunch of uncataloged Dynatron or Cooljag skived fin heatsinks that I'm not aware of), and if the case can accommodate, say, up to 40mm, still, I could list only 20+, but already in this range Thermolab ITX30 (30mm) and Noctua L9i/L9a (37mm) beat CNPS2X fair and square in direct comparisons ( here and here, for instance), and I'm pretty sure Jonsbo HP-400 (36mm) and Silverstone AR05 (37mm) do as well (according to esplin2966 and dondan's tests.)Really looking forward to this!
I don't know the exact CPU cooler height limit of S4, but If you mean as restrictive as less than 30mm tall for instance, then I can't think of 30+ options (unless there are bunch of uncataloged Dynatron or Cooljag skived fin heatsinks that I'm not aware of), and if the case can accommodate, say, up to 40mm, still, I could list only 20+, but already in this range Thermolab ITX30 (30mm) and Noctua L9i/L9a (37mm) beat CNPS2X fair and square in direct comparisons ( here and here, for instance), and I'm pretty sure Jonsbo HP-400 (36mm) and Silverstone AR05 (37mm) do as well (according to esplin2966 and dondan's tests.)
Really looking forward to this!