The temps of the 4800 series are perfectly fine
Those cards are built to handle 100c ++
The reason that they are so hot is because ATi has chosen for silence, standard the fan runs at 20%
But there is a very simple solution for this:
1. Start up Catalyst Control Center and activate ATi overdrive.
2. Go to Profile > Profiles Manager and make a new profile, call it HD4870 or something like that.
3. Go to C:\Documents and Settings\<Username>\Local Settings\Application Data\ATI\ACE\<Profilename>.XML (XP) or C:\Users\<Username>\AppData\Local\ATI\ACE\<Profilename>.XML (Vista)
You need to have "Show hidden files and folders" enabled in mapoptions
4. Open the XML file (notepad or such) and change the following;
</Feature>
<Feature name="FanSpeedProtocol_0">
<Property name="FanSpeedProtocolProperty" value="Percent" />
</Feature>
<Feature name="FanSpeedAlgorithm_0">
<Property name="FanSpeedAlgorithm" value="
Manual" />
</Feature>
<Feature name="FanSpeedRPMTarget_0">
<Property name="Want" value="0" />
</Feature>
<Feature name="FanSpeedPercentTarget_0">
<Property name="Want" value="
35" />
</Feature>
5. Open up Catalyst Control Center again and go to Profiles > Activate Profile > HD4870 (or whatever you called it)
I got it set at 35 as you can see and my HD4870 idles at 47c and it isnt even that loud
Try setting it at 100 for fun, your very own aeroplane next to you 
edit:
Actually i suggest u to buy a 9800gx2 or a gtx280 , Ati sux hard , those video cards are cheap and ridicoulous , i had 3 in my lifeand i had to change them each month , because they had graphical problems , one burnt and the other was crashing in games so
ati
So because ATi cards are cheap (wich is awesome) they suck?
The HD4870 beats the crap out of the GTX260 and comes close to the GTX280, and those cards were €200+ more expensive then the HD4870. The only way nVidia could compete was by lowering the prices because they couldnt keep up with the ATi cards
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