Did you update the drivers for the new card? We may have a resource issue going on here.
For those whose mouse jitters, hops, jumps, stutters, etc. here are a few other "causes" not directly related to this specific issue: ... one should work for you
They all seem to have one think in common. I also have noted my optical mouse goes haywire when I've reached the edge of the pad
1. From a gamer: "A mouse pad that does not perfectly reflect light or whose surface is not slick will cause a mouse to stutter."
2. "Not NVIDIA Issues—SLI
• GeForce 6800/6600 GT: Slow performance with World of Warcraft in SLI mode.
This is not an NVIDIA bug, but instead the result of a recent patch for World of Warcraft to reduce mouse lag on slower computers by synchronizing the GPU(s). This change is unnecessary for NVIDIA users, and particularly for users with SLI configurations.
For optimal performance when playing World of Warcraft in SLI mode:
• Disable vertical sync within the World of Warcraft in-game video options.
• Enable "hardware mouse" acceleration and disable "smooth mouse" within
the World of Warcraft in-game video options.
"Smooth mouse" reduces mouse lag when the frame rate is low and "hardware mouse" is disabled."
3. I've run into this problem with a couple of standard Logitech optical mice. The problem does not appear to be with the mouse, but with the mouse pad. Try using the mouse on a flat, hard surface such as a table or desktop surface. If this fixes the problem, then it's the mouse surface that you are using.
4. I use a MSFT Intellimouse Optical, and I noticed this same problem whenever I used the mouse on my gel mousepad. Now, I have to use the mouse on the hard-wooden surface...so far no problems.
5. i have a msft intellimouse explorer and i found i was able to get rid of the jitteryness by screwing with the settings in the control panel for it
6. Is this a laptop? Maybe a conflict with the driver or support software for the built in pointing device? Since you using a USB mouse ..try disabling the PS2 mouse option in your BIOS if it is there. (...too many devices trying to control one pointer
7. The optical eye requires a lot of detail to work properly. Optical mice won't work properly on shiny. smooth or surfaces that are highly repititive like newsprint. I had a Intellimouse Explorer that would work on my leg and the woodgrain on my desk but sometimes on my smooth mousepad the cursor would head in the opposite direction.
8. I use a several brands of optical mice on a plain black neoprene mouse pad and I haven't noticed this problem. However, when using a plastic coated mousepad, I get that problem due to the reflection. Even the slightest reflection seems to throw the mouse off...
9. I use my Logitech Opti Scroll mouse on a white sheet of paper. This is when I want more movement for the mouse.
Probably a ton more out there...