Hey, thanks!
I've searched their site before, but this time I just used the link I had handy, which was using their memory-finder to show memory compatible specific W680 motherboard. So, hopefully that's just because they have yet to certify it for that board and not because it's incompatible.
My recollection is that ECC memory usually carries a bigger price premium than it logically should, but not by nearly
that much!
In the case of the two examples I quoted above, the Newegg price for Kingston DDR5-4800 ECC is only 20% greater than non-ECC, while Crucial's is 60.3% greater. However, I'm sure that's more to do with the price of the non-ECC DIMMs I'm comparing against ($125 vs. $78), since they differ more than the ECC DIMMs ($150 vs. $125) in both absolute and relative terms.
FWIW, the only place I found that DDR5-5600 ECC UDIMM was provantage:
Get Fast Service & Low Prices on KSM56E46BD8KM-32HA Kingston Technology 32GB 5600MT/S DDR5 ECC CL46 DIMM 2RX8 Hynix A and Much More at PROVANTAGE.
www.provantage.com
Out of curiosity, which sites do you usually order from?