Cooling for x850 xt pe?

i have an x600 xt currently, and temps are b/w 35 and 38 celc. have 3 90 mm case fans, and two dual 80 mm fans on the ultra x connect 500 watt psu. I am considering getting this x850 xt pe, ridiculously low priced
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1476861&Sku=C261-3025 R
i have no idea whether overheating will become a problem. suggestions?

 

i put the temp sensor in a different place on my x600 xt, and its now 47-50C while not playing games. Can it be locking up my computer due to that? since i am getting the x850 xt...i dunno if i need more cooling..and if i do, it would probably have to be water cooling, because i already have 3 case fans and 2 power supply fans. However, i am completely new to water cooling, and any suggestions reagarding this would be welcome. thanks

 

There are PCI slot fans that intake air from outside the case and blow it onto the video card. If you're card doesn't intake air (like an ATI x800), then this might be a solution. They are availible where the fan has three speeds, so you can turn it down when not using it. I don't have my temp sensors in yet, so I'm not sure how much it helps, but I have been told by others that it makes a big difference.