Apparently,
Newegg has made the executive decision to deliberately cripple its parametric search.
A few experiments:
1.) search desktop memory for DDR3 1866 and/or CL rating
2.) search motherboard by form factor, e.g. uATX, mITX
3.) search power supplies by 80PLUS certification
In summary, all of these options (and surely a bunch more) have been completely removed from parametric search. Absolutely worthless.