I can't see there being any advantage to that, isn't DXD btwn 256 and 512?
dxd is PCM. 352/24 bit or 32 bit and 384/24 bit or 32 bit.
512 is 8xdsd, 256 is 4xdsd.....commonly known as Quad dsd.
my Formula dac upsampled everything (but only PCM) to dxd (either 352 (44, 88, 176) or 384 (48, 96, 192) depending whether it started as a 44 or 48 multiple format). you could not input dsd at all (which has now changed with this update or the newest versions of the Formula). so to hear dsd you needed to then have server software that would upsample any dsd to PCM first. in my case I had the SGM and HQP upsample all resolutions of my dsd to dxd.