Xeon Server very slow after load reach 4.0

HI

I have server Dual xeon 2.8 Ghz HT
with 2048 GB RAM
cpanel/whm

Every time when the load reach 4 for any circumstances the server became very slow (I mean it)

any ideas ??

My httpd.conf

Timeout 300
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 15
MinSpareServers 5
MaxSpareServers 10
MaxClients 512
MaxRequestsPerChild 0

My.cnf
HTML Code: 
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-locking
skip-innodb
query_cache_limit=1M
query_cache_size=64M
query_cache_type=1
max_connections=512
interactive_timeout=100
wait_timeout=100
connect_timeout=10
thread_cache_size=128
key_buffer=64M
join_buffer=1M
max_allowed_packet=700M
table_cache=1024
record_buffer=1M
sort_buffer_size=2M
read_buffer_size=2M
max_connect_errors=10
# CPU's*2 for thread_concurrency
thread_concurrency=2
myisam_sort_buffer_size=96M
log-bin
server-id=1

[mysql.server]
user=mysql
[safe_mysqld]
err-log=/var/log/mysqld.log
pid-file=/var/lib/mysql/mysql.pid
open_files_limit=8192

[mysqldump]
quick
max_allowed_packet=16M

[mysql]
no-auto-rehash
#safe-updates

[isamchk]
key_buffer=96M
sort_buffer=96M
read_buffer=96M
write_buffer=96M

[myisamchk]
key_buffer=96M
sort_buffer=96M
read_buffer=96M
write_buffer=96M

[mysqlhotcopy]
interactive-timeout

 

 

 

 

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