Have you looked up all the threads about the gtx 460 in general having issues regardless of brand? Well I am going to tell you that this cards isn't one that is made to last. Without cooling for the power vrm and vram the card will likely fail after a few thousand hours of use but expected life is well below 10,000 hours max or two years of daily use. Basically it is the performance of a single gtx 280 with the power consumption of a gtx 260~ in a smaller space with very poor cooling. Just about every model of this card requires some modding but a lot of care and attention if it is meant to last.
What case do you have and how many fans are installed?
My case is Thermaltake Xarser VI
3 140m and 2 120m fans
Do you think buying aftermarket cooler will lessen the heat of my gpu like deep cool v4000 !
some comfirmed that the deep cool v4000 it will fit the palit gtx 460....http://www.deepcoolglobal.com/Product/V4000/