here are a few excerpts
Con :it does run hot with the stock heat sink. I have a friend that is using the Zalman VF1000 cooler on this card and he is satisfied with the temps. I forgot what he told me the temps were but he is running two of these CrossFire with the Zalmans on them and he's been playing Crysis with no problem. It's just a shame that the stock heat sinks don't keep the card cool enough. I can see where the cards would fail due to high temps.
Cons: Runs insanely hot, I'm not even kidding. I knew this in advanced from reading reviews, benchmarks and because ATI cards just run really really hot but wow...
Cons: Card runs very hot, but it’s due to having a single slot cooler solution. Fan gets loud when doing the XML fan mod. solved the problem with a Koolance water block.
Cons: the heat this thing generated overwhelms any attempt to cool it. I've got seven fans in a roomy case and still, mid-game, the heat will kill the system and force a restart. (even WITH the ati 4850/4860 fan speed hack!)
Cons: There's a fine line between a "good value" and "shoddy riffraff", and this crosses into the less admirable category. Don't be fooled--the card doesn't just "run hot." Even with the (buggy) fan controller software, at full speed, it both sounds like a jet engine and runs at 70 degrees during some games. That is completely unacceptable, especially because it's so hot that it affects my CPU cooling. I would be scared to think of what kind of cooling would be necessary if you wanted to CrossFire these.
Con: Very, very hot even in a Silverstone towercase with the wind tunnel and several fans, the heat output is ridiculous. After 3 months, I started seeing gray dots an dlines on the video during post and when I tell XP to go into VGA/safe mode it does not recognize the card. I reinstalled XP, installed newer drivers and swapped out the heatsink..this is being RMA'd. First time RMA'ing to Asus after buying lots of their products...lets see what their support is like....
con
oor cooling at default speed, head-splitting noise at higher fan speeds.
con: The card will overheat when displaying a simple EGA screen, such as your PC bios. the fan appears to be running fast enough, yet the card overheats. Weird. In gameplay, the card will occasionally display a pop-up window "VPU Recover has reset your graphics accelerator as it was no longer responding to graphics driver commands". Upgrading to latest driver did not resolve this.
con :Hot and can be somewhat noisy when the fan is over 60%
Trust me i had the 4870 version and had to modify it . Remember this is on a down clocked 45 nm chip not a 200 gtx 55nm chip it will run hotter than any 4800 series card with maybe the 4890 toxic as a exception.