diff --git a/firmware/export/system.h b/firmware/export/system.h
index e4de5889c5..8ab2ac7174 100644
--- a/firmware/export/system.h
+++ b/firmware/export/system.h
@@ -289,7 +289,11 @@ static inline void invalidate_icache(void)
 #define CPUFREQ_DEFAULT      (CPUFREQ_DEFAULT_MULT * CPU_FREQ)
 #define CPUFREQ_NORMAL_MULT  4
 #define CPUFREQ_NORMAL       (CPUFREQ_NORMAL_MULT * CPU_FREQ)
+#ifdef IRIVER_H300_SERIES
+#define CPUFREQ_MAX_MULT     8
+#else
 #define CPUFREQ_MAX_MULT     11
+#endif
 #define CPUFREQ_MAX          (CPUFREQ_MAX_MULT * CPU_FREQ)
 
 #elif CONFIG_CPU == PP5020
diff --git a/firmware/system.c b/firmware/system.c
index 5e8a7cd4d7..a6474549f5 100644
--- a/firmware/system.c
+++ b/firmware/system.c
@@ -599,7 +599,11 @@ void set_cpu_frequency(long frequency)
               /* Refresh timer for bypass frequency */
         PLLCR &= ~1;  /* Bypass mode */
         timers_adjust_prescale(CPUFREQ_DEFAULT_MULT, false);
+#ifdef IRIVER_H300_SERIES
+        PLLCR = 0x1183e005;
+#else
         PLLCR = 0x11856005;
+#endif
         CSCR0 = 0x00001180; /* Flash: 4 wait states */
         CSCR1 = 0x00000980; /* LCD: 2 wait states */
         while(!(PLLCR & 0x80000000)) {}; /* Wait until the PLL has locked.