[users@httpd] http processes killing server

[Benjamin Adams <badams@xxxxxxxxxxxxxx>]

I have a Mac Server running tiger with Dual G5 and 8G Ram
running apache 1.3.33, php4, MySQL 4.1 (10G Database)

Processes:  129 total, 4 running, 5 stuck, 120 sleeping... 309  
threads 18:58:02
Load Avg:  3.84, 4.29, 3.88     CPU usage:  3.3% user, 75.2% sys,  
21.5% idle
SharedLibs: num =   27, resident = 9.18M code,  696K data, 4.04M  
LinkEdit
MemRegions: num = 24727, resident =  342M + 11.5M private, 65.9M shared
PhysMem:   380M wired,  386M active, 3.89G inactive, 4.64G used,  
3.36G free
VM: 8.76G + 18.9M   5911231(0) pageins, 5472(0) pageouts

  PID COMMAND      %CPU   TIME   #TH #PRTS #MREGS RPRVT  RSHRD   
RSIZE  VSIZE
27164 httpd       25.1%  3:04.91   1    12   180  4.48M  35.7M  13.1M 
+  128M
27168 httpd       22.5%  3:35.49   1    12   182  3.36M- 35.7M  14.1M 
+  128M+
14112 httpd       21.8%  0:22.96   1    12   179  3.36M  35.7M  7.94M 
+  127M
27426 httpd       18.2%  4:06.94   1    12   180  4.32M  35.7M  13.9M 
+  128M
27167 httpd       16.9%  3:13.61   1    12   181  4.31M+ 35.7M  12.9M 
+  128M+
11990 httpd       15.8%  0:34.96   1    12   175  3.54M  35.7M  11.1M 
+  128M
15345 top         15.4%  0:40.40   1    39    23  1.64M   532K   
2.08M  27.0M
15452 httpd       13.3%  0:05.55   1    12   179  3.19M+ 35.7M   
6.37M-  127M
    0 kernel_tas   2.0% 15:48:40  44     2  8725  74.9M     0K    
300M  1.72G
15834 xftpd        0.1%  0:00.11   1    18    21   264K   652K    
888K  27.0M
15715 httpd        0.1%  0:04.78   1    12   174  2.84M  35.7M   
7.85M   127M
18420 SecurityAg   0.1%  5:43.07   1    72   105  1.70M  10.4M   
8.07M   151M
27163 httpd        0.1%  5:12.64   1    12   175  4.64M  35.7M  14.3M 
+  128M

http processes hit 50+ the server dies, how can I stop this for  
happening?
it runs fine when the processes are 20-40
httpd.conf
ExtendedStatus On
Timeout 30
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 10
MaxClients 500
MinSpareServers 3
MaxSpareServers 5
StartServers 4
MaxRequestsPerChild 8000

any help would be great!!

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