DSD512 upsampling computer advice

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Another thread about DSD512 upsampling -

DSD512 - Is this even possible? [yes, just needs more cpu]

I run Roon Server on a 8 core/16 thread Xeon machine. The clock is 2.6Ghz. It has 16GB of RAM. I have never successfully upsampled to DSD512, although I have a couple DACs capable of that res. I am thinking that clock speed, rather than number of cores, is the limiting factor. Is this true? I upsample to DSD256 without any problems. Is DSD512 more than just theoretically possible? Is so, some recommendations on capable machines, please. Thanks.