Well to be honest i aint sure. This setup now is the 1st time i've been happy with it in the 18 months that i've had it. well last few months actually i've been happy with it. Im only using a 64bit 3000 venice core, so its at a low 1.8GHz, but apparently my evap head is at about -55 to -65, i found that you need to use ALOT of heat transfer compound on the evap head to make sure its effective. Sometimes i even get ice forming on the pipe leading to the evap head :S i've even had to cover the top of my GFX card with seal string to protect it effeciently against water droplets! but without owning a GT i cant honestly compare