--- top/top.c
+++ top/top.c	2012-06-04 10:36:26.252009786 +0000
@@ -1777,7 +1777,10 @@ always:
    Fieldstab[P_CPU].fmts = " %#4.1f ";
    if (Rc.mode_irixps && smp_num_cpus() > 1 && !Thread_mode) {
       Cpu_pmax = 100.0 * smp_num_cpus();
-      if (smp_num_cpus() > 10) {
+      if (smp_num_cpus() > 100) {
+         if (Cpu_pmax > 999999.0) Cpu_pmax = 999999.0;
+         Fieldstab[P_CPU].fmts = "%6.0f ";
+      } else if (smp_num_cpus() > 10) {
          if (Cpu_pmax > 99999.0) Cpu_pmax = 99999.0;
          Fieldstab[P_CPU].fmts = "%5.0f ";
       } else {