Every time I play a game, I experience random stuttering of video and the FPS counter very briefly goes down to 0. This stuttering can be seen in this YouTube video, with the most obvious stuttering occurring at 0:04.
I have verified that PhysX on my Nvidia GTX280 is switched to the card, not the CPU, and I've also verified that the card is running at 'Maximum performance' and not 'Adaptive'.
This occurs regardless of the graphics settings in the games, and I suffer no other issues related to the graphics or FPS.
I realise that the GTX280 is (by today's standards) 'ancient', but it still runs every game I throw at it on maximum graphics settings, but only with this small stuttering. I wouldn't have an issue with it, but however the stuttering occurs most when a shot gets fired near me, or an explosion happens. Now, this would normally be related to the CPU, but my last graphics card that I had (an AMD Radeon HD7700 [the GTX280 is much better, besides the AMD card being newer]) never had this stuttering with the same system setup.
There's a Wikipedia page about this 'micro-stuttering', but I'm not operating on an SLi configuration. Apparently this issue could be caused by PhysX using the CPU instead of the GPU, but I've verified that PhysX is using the GPU and not the CPU. This isn't an AMD GPU. I don't have Watchdogs, so I can't test this.
Is there a fix for this, and if so, how can this be fixed (please don't say 'upgrade your GPU', because that's not going to happen for a while)?