4890 turbo overclock

Hi, I wanted to overclock my HIS 4890 and I was wondering how high i could go safely.
It is already at 850mhz (factory settings) core clock. Heres a link to it (i know it's deactivated)

http://www.newegg.com/Product/Product.aspx?Item=N82E16814161299&cm_re=N82E16814161299-_-14-161-299-_-Product

it has this iCooler x4 Cooling Technology thats supposed to keep it cooler and if it does, how much cooler? i have an antec 300 case and it has the option for up to 4 case fans but it already has 2. should i add more if i am going to overclock. i would like to get it to 910mhz, or more, but will that make a big difference? I am new to overclocking.
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More about 4890 turbo overclock
  1. Anonymous486 said:
    Hi, I wanted to overclock my HIS 4890 and I was wondering how high i could go safely.

    if you use Catalyst overdrive settings i think you be safe .....simple if is too much of OC the card will crash
    (then is the question ...if you go let said up to 100 C is worth if you gain let said in the game 5-7 frames per second )
    if you use big tv maybe you can see difference ...but on small tv ..4890 is fast already
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