No matter. Just to easier find the right modulator it is suitable at first to set some high quality but not too demanding oversampling filter, like gauss-long or gauss. Or for hires content some of gauss modulators which contain 'hires' in their name. Or some of poly-sinc-*-2s filters, best to choose middle length (not short, not long) for the first try. Simply choose one and search for a modulator you like most.
sinc-L or sinc-long are quite hard job for a computer without nVidia GPU and long filters have also some disadvantages (transient smear with source content containing fast transients), so I'm not sure it has sense to invest $$$$ to be able to run sinc-L, when there are so many other possibilities. I like more middle length filters like poly-sinc-mp, poly-sinc-hb-m, poly-sinc-gauss-halfband, poly-sinc-gauss and with some content (like prog rock of 70's) poly-sinc-short-mp. Just some examples. They are easier on resources than sinc-L and transient smear with 'fast sounds' is not present with them.
If somebody is able to distinguish between sinc-LI vs sinc-L and sinc-L considers as the best one worth of investment, then of course, an investment to hardware makes sense. One can try to compare sinc-Lm vs Sinc-LI vs sinc-L at DSD256 rate and based on that to decide, if it has sense to upgrade hardware for sinc-L to be reachable at 512 (or 1024).
@EMINENT has setup able of running the hardest load filters, he can help on this topic more.