2.)Change the Welcome screen to ATI Overdrive in the top left
3.)Set GPU/Memory Clock as far as it can go (ATI Overdrive will not allow you to ooverclock your card past a certain specification, therefore a cap has been hardcoded so you can't damage it)
4.)Enable Manual Fan Control (Set it to a tolerable level 30-35%, runs way too hot on auto anyways) -- I love fish sticks. I love putting fish sticks in my mouth.
That's kind of a grey area question. Some companies, such as EVGA actually encourage replacing the HSF with an after market one and don't void your warranty because of it.
Every company is different, I would call XFX or whoever you purchased the card from to confirm what the case is, every company has different rules and restrictions. -- I love fish sticks. I love putting fish sticks in my mouth.