Uhmm that isn't a motherboard part / name / etc. it means BULK as in a group not invididual purchase. So you a customer buys INDIVIDUAL parts, the STORE buys the parts in BULK or in mass.
As for performance, this supports NORMALLY only IVY chipset. The current is Haswell and the one prior is Sandy bridge which can be done with a BIOS upgrade on that board you picked.