İyi günler sunucuda mysql cpu kullanımı 100% ü geçtigi oluyor acaba my.cnf ayarlarımda bi sorun olabilirmi ?

Sunucu Özellikleri
2 x Intel Xeon Quad-Core Harpertown 2.5GHz
2048 MB of DDR Memory
Single 320 HDD

Şuanki my.cnf
[mysqld]
safe-show-database
old-passwords = 1
max_connections = 650
max_user_connections=300
key_buffer_size = 512M
myisam_sort_buffer_size = 64M
join_buffer_size = 1M
read_buffer_size = 1M
sort_buffer_size = 2M
table_cache = 4000
thread_cache_size = 384
wait_timeout = 20
connect_timeout = 10
tmp_table_size = 64M
max_heap_table_size = 64M
max_allowed_packet = 64M
net_buffer_length = 16384
max_connect_errors = 10
thread_concurrency = 16
concurrent_insert = 2
#table_lock_wait_timeout only for mysql5
table_lock_wait_timeout = 30
read_rnd_buffer_size = 786432
bulk_insert_buffer_size = 8M
query_cache_limit = 7M
query_cache_size = 64M
query_cache_type = 1
query_prealloc_size = 262144
query_alloc_block_size = 65536
transaction_alloc_block_size = 8192
transaction_prealloc_size = 4096
max_write_lock_count = 16
skip-name-resolve
skip-locking
[mysqld_safe]
open_files_limit = 8192

[mysqldump]
quick
max_allowed_packet = 16M

[myisamchk]
key_buffer = 384M
sort_buffer = 384M
read_buffer = 256M
write_buffer = 256M