Will LRDIMMs work on my X10SRi-F motherboard?

Yes, as long as you don’t mix them with RDIMMs. The X10SRi-F uses the C612 chipset, which officially supports both RDIMM and LRDIMM up to 512GB at 2133/1866/1600 MT/s. Mixing RDIMMs and LRDIMMs in the same system will not work. ECC will function normally with LRDIMMs.