All over clocking will produce more heat as it chip is going outside of clock speed for what it is supposed to work at in normal.
Originally Posted by email@example.com
Heat could also be reason you see tearing as in more motion you will also have the card to work more. In PC game where you use 3D rendering and have tearing you will very often have a problem related to how much memory your video card have for framebuffer and how fast it can render it to screen.
I had once GeForce 2 MX100/200 and watched streamed material in DVD quality and have never seen any tearing at that time on my computer screen. Network is on 10 Mb/s so your network at 100 Mb/s should work just fine with DVD material. Just for your information, even a dedicated DVD player might have problem with some scenes if it is too much going on at once, so it is not necessary that your video card/network are the bottle neck for this to happen. In most cases you will have stuttering if your network can't keep up to feed your player with enough video/audio or it will drop frames.
Problem related to motion could also be with how the source material was made in the first place and what kind of resolution and interlacing that was used for it.
What is Interlacing?
Abit AT8-32X/Athlon64 X2 4200+@2200Mhz/2GB DDR RAM/Samsung 2x 250 GB/Club3D X1950XT+PowerColor Theatre 550 pro (PCIe x1)
CRT 19 inch/ 1600 x 1200 pxl/32 bit colour
Logitech Z-5400 surround system - DDL/DD ProLogic2 (96kHz/24kbit)/DTS decoder
OS: Windows XP Pro x64 edition.
PVR: GBPVR v.1.1.15;MPC+FFDshow+Haali splitter and renderer (use SM 2.0 on videocard);Avidemux+AutoMen+MPlayer/MEncoder/Stattik batch file