Quote Originally Posted by trt740 View Post
They are nearly as hot as 4870's, I know I have two in 4850s crossfire and most certainly they are hotter than a single 4870. My two Duorbs hit 70c with my 4850's oced to 700/1150. I'm gonna swap one Duorb out for a Gx815 http://www.newegg.com/Product/Produc...7009&Tpk=gx815 due to fan noise on the other two Duorbs I tried, but 70c in crossfire is not bad at all, and the one Duorb I'm keeping is silent. To be fair I do have a thermaltake armor case (with 250mm side fan remove), but it has a True in it with 2x120mm 70cf and 63cf fans mounted on the cooler, plus a 120mm 73CF intake and exit fans ,and two more 92mm 43CF fans, plus a 120mm PSU fan. Try these If you need more air flow, they can handle 4870s in crossfire no sweat. http://www.pctoys.com/840556087687.html they are slimmer than the original ACx2 coolers and can be used with regular crossfire bridges, plus are silent as hell. Here is another option the Gigabyte v power they are super good on 4870 cards and can be had cheap if you can find them http://www.performance-pcs.com/catal...2a8c9b3fbe415f (this however is not cheap) Glad I didn't buy the Trad, first Thermalright I have seen thats not great.
I tried a DuOrb on my 4870 and ALL the temps went through the roof, so that quickly went back to the shop. Seemed like a cheaply built cooler as well, not trying to knock your setup just my opinion. I am tempted by the Twin Turbo and V Power, but if I do use aftermarket on these cards it will probably be a set of Zalman VF900s I already own from my old X1900 CF setup. Honestly I think this T-Rad2 would probably be perfect for a 4850 but after being told to piss off my Thermalright's tech support just for asking some basic questions I think I will tell them to piss off by not buying the products...I sent the T-Rad2 back to Heatsink Factory yesterday anyways.