vBulletin Config to properly enable Memcached for VB4?

Is this code correct?

Code:

$config['Datastore']['class'] = 'vB_Datastore_Memcached';
$i = 0;
// First Server
$i++;
$config['Misc']['memcacheserver'][$i]        = '127.0.0.1';
$config['Misc']['memcacheport'][$i]        = 11211;
$config['Misc']['memcachepersistent'][$i]    = true;
$config['Misc']['memcacheweight'][$i]        = 1;
$config['Misc']['memcachetimeout'][$i]        = 1;
$config['Misc']['memcacheretry_interval'][$i] = 15;

Or there is more efficient way?

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