The Intel systems run Mac OS X 10.4 Tiger identically on the surface as ordinary Macs, with the exception of a modified Processor System Preference (from Apple's CHUD tools) that allows the user to toggle Hyper-Threading on or off. Apple System Profiler includes a new line under Hardware listing CPU Features; for the 3.6GHz Pentium 4 this comprises a rather lengthy list of technical acronyms: FPU, VME, DE, PSE, TSC, MSR, PAE, MCE, CX8, APIC, SEP, MTRR, PGE, MCA, CMOV, PAT, PSE36, CLFSH, DS, SCPI, MMX, FXSR, SSE, SEE2, SS, HTT, TM, SSE3, MON, DSCPL, EST, TM2, CX16, and TPR.

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