Y1
Y2
Primary (TH) system clock crystal
Secondary (SMT) system clock crystal
Y3
Y4
Y5/H5
Y6
L1–5
Primary NIC clock crystal
Secondary NIC clock crystal
RTC clock crystal/tie-down
SATA-to-PATA crystal
USB chokes
278 Appendix E System Board and Riser Board Reference Designators
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