diff --git a/sys/dev/hwpmc/hwpmc_intel.c b/sys/dev/hwpmc/hwpmc_intel.c
--- a/sys/dev/hwpmc/hwpmc_intel.c
+++ b/sys/dev/hwpmc/hwpmc_intel.c
@@ -99,7 +99,7 @@
 	    family, model, stepping);
 
 	switch (cpu_id & 0xF00) {
-	case 0x600:		/* Pentium Pro, Celeron, Pentium II & III */
+	case 0x600:
 		switch (model) {
 		case 0xE:
 			cputype = PMC_CPU_INTEL_CORE;
diff --git a/sys/i386/include/pmc_mdep.h b/sys/i386/include/pmc_mdep.h
--- a/sys/i386/include/pmc_mdep.h
+++ b/sys/i386/include/pmc_mdep.h
@@ -45,10 +45,6 @@
  * TSC		The timestamp counter
  * K7		AMD Athlon XP/MP and other 32 bit processors.
  * K8		AMD Athlon64 and Opteron PMCs in 32 bit mode.
- * PIV		Intel P4/HTT and P4/EMT64
- * PPRO		Intel Pentium Pro, Pentium-II, Pentium-III, Celeron and
- *		Pentium-M processors
- * PENTIUM	Intel Pentium MMX.
  * IAP		Intel Core/Core2/Atom programmable PMCs.
  * IAF		Intel fixed-function PMCs.
  * UCP		Intel Uncore programmable PMCs.
diff --git a/sys/sys/pmc.h b/sys/sys/pmc.h
--- a/sys/sys/pmc.h
+++ b/sys/sys/pmc.h
@@ -86,13 +86,6 @@
 #define	__PMC_CPUS()						\
 	__PMC_CPU(AMD_K7,	0x00,	"AMD K7")		\
 	__PMC_CPU(AMD_K8,	0x01,	"AMD K8")		\
-	__PMC_CPU(INTEL_P5,	0x80,	"Intel Pentium")	\
-	__PMC_CPU(INTEL_P6,	0x81,	"Intel Pentium Pro")	\
-	__PMC_CPU(INTEL_CL,	0x82,	"Intel Celeron")	\
-	__PMC_CPU(INTEL_PII,	0x83,	"Intel Pentium II")	\
-	__PMC_CPU(INTEL_PIII,	0x84,	"Intel Pentium III")	\
-	__PMC_CPU(INTEL_PM,	0x85,	"Intel Pentium M")	\
-	__PMC_CPU(INTEL_PIV,	0x86,	"Intel Pentium IV")	\
 	__PMC_CPU(INTEL_CORE,	0x87,	"Intel Core Solo/Duo")	\
 	__PMC_CPU(INTEL_CORE2,	0x88,	"Intel Core2")		\
 	__PMC_CPU(INTEL_CORE2EXTREME,	0x89,	"Intel Core2 Extreme")	\
@@ -155,9 +148,6 @@
 	__PMC_CLASS(TSC,	0x00,	"CPU Timestamp counter")	\
 	__PMC_CLASS(K7,		0x01,	"AMD K7 performance counters")	\
 	__PMC_CLASS(K8,		0x02,	"AMD K8 performance counters")	\
-	__PMC_CLASS(P5,		0x03,	"Intel Pentium counters")	\
-	__PMC_CLASS(P6,		0x04,	"Intel Pentium Pro counters")	\
-	__PMC_CLASS(P4,		0x05,	"Intel Pentium-IV counters")	\
 	__PMC_CLASS(IAF,	0x06,	"Intel Core2/Atom, fixed function") \
 	__PMC_CLASS(IAP,	0x07,	"Intel Core...Atom, programmable") \
 	__PMC_CLASS(UCF,	0x08,	"Intel Uncore fixed function")	\