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When Leadtek announced the PX8400 GS TDH Silent on August 20th they compared the video card to the Airbus A380 claiming a perfect combination between silence and luxury. Simply put this translates into friendly marketing speak to describe the integrated HD video support and passive GPU cooler both of which are welcome additions to any HTPC or general purpose computer.
The heatsink does appear to be mass produced and very utilitarian in nature unlike some of the aftermarket GPU heatsink solutions you'll find on the market. However you canot beat the overall cooling ability especially if your chassis has good airflow.
Performance wise the 8400GS is at a disadvantage when it comes to gaming due to the 64-bit memory interface, but the card does hold its own. In terms of overclocking WinFox II made the process very easy and after a few quick stability tests we settled on a respectable 501/962 MHz even without hardware and/or voltage modifications.
To that point Leadtek does offer an overclocked version of the PX8400 called the "WinFast PX8400 GS TDH Extreme" This card features the same design, active cooling, and roughly 30% higher performance, might be worth checking out if you have a few extra bux.
Now for the ever popular list of Good things and Bad things.
Built In HDTV and Video Decoding
Smooth H.264 Video Playback
DirectX 10 Support
Passive cooling can create heat islands in your case
No HDMI connection