Installation

Inside the package we found not one but two manuals. Only one is of good use though as the other is in fact made for the original Stealth water block which was G80 compatible only. Anyways, there is a G92 manual so no worries; it explains how to properly fit the heat sink on your 8800 GT, only downside is that it is only in 2 languages and there is no clear picture which shows you how the bolts have to go through (remember those fancy Swiftech drawings). All together, these are just details and the block is so simple to install that I don't think that anyone can go wrong here. Just keep in mind that you need the right material to fix the INBUS screws in place.



Test Results

We ran the Leadtek 8800 GT at two difference speed, NVIDIA reference speeds as well as at overclocked settings. For starters here is the outcome when the card is clocked at reference speeds:



The Leadtek PX8800GT ZM is equipped with the Zalman VF850 heatsink and scores even in auto-mode quite a bit better then the reference heatsink found on most 8800GT's. The G92 core produces quite some heat however and the VF850 is not entirely silent even if you use it in auto-mode. I noticed the fan speed go as high as 70% but luckily for the owners of this heatsink the fan itself is not as noisy as many others. With the fan speed tricked to 100% the thermal performance does not improve that greatly.

Switching to the XIREX Stealth block I saw a ~12 degrees temp drop and don't forget that this is a full cover block so not only the GPU is running relatively cold but also the other components touching the block. When we boost the fan/pump speed to 12v the temperature drops another 4°C and should give you headroom for overclock… so let’s find out:



After increasing the video card GPU clocks we ran the same tests once more and it is again the Xirex block which shows us its superior performance compared to the VF850.