Hi guys, I'm using the PC on the signature and 177.83/latest Physx drivers and latency for me it is "all green", all the way. I use this pc for both games and sound/video recording (SONAR 7/Vegas 8) and I have recorded up to 9 guitar tracks on top of each other yesterday with these drivers and no abnormalities were found so far. I use the ASIO drivers and my latency is as low as 10ms, which is great for recording audio tracks and using DxI (DirectX Instruments). I see that some above are talking about DPC and I would like to tell you what happened in my laptop, which has a similar Geforce board (8400M G): Whenever Daemon Tools Lite (4.13 I think) is installed, one of my cores (core duo processor) is 25% busy all the time. After many weeks of reasearch I found through Process Explorer (task manager does not show that at all) that "Hardware Interrupts" were causing the 25% load on the core. Upon disabling Dtools' virtual IDE controller on the device manager (it automatically changes its name all the time), the load would drop to 0% (normal), therefore, I am 100% sure that it is DTools which caused such headache. And whenever I tried to record audio/watch movies/listen to music on my laptop, these audio peaks/distortions would appear and I would need to raise the latency to almost unrecordable levels (which led the audio tracks to get out of sync during recording, which is the worst thing that can happen to music...lol). I never really complained about it to Dtools developers' because I am in fact too lazy to keep reproducing the problem and taking screenshots and so in order to prove it to DTools team that this issue occurs, and in any event, I keep Dtools installed and only disable the controller; once in a while, when I need to mount some image (very rare) I turn it on, use the PC with the annoying "Hardware Interrupts" and turn it off as soon as I finished installing from the virtual drive, so that's no big deal for me... I hope it can help you solve your issue, Mr. DJ..