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I am experiencing the same issue with Windows 8.1 64-bit. I just updated my OS today and installed the latest drivers from Nvidia for the 650m SLI (327.23), the second card is visible but not functional. "Windows has stopped this device because it has reported problems. (Code 43)" is what the Device Manager displays for the ultrabay GPU. I did read somewhere as well that the vbios for the second GPU is not being updated with the first.

Hope this is ok to ask. I flashed the bios and all went well. Thank you so much svl7 very cool what you have done for all of us. I now want to flash my 650m ultra bay. Question I would like to ask is do you do it he same way as flashing the bios also using the same dos commands to flash the ultra bay? of course the difference being the .rom file name Thank You Again in advance

I usually always have vsync enabled. Even with a frame rate limiter like with MSI afterburner, tearing is still quite apparent with the SLI setup. If my fps drops to like 40, the stuttering happens more I suppose. I've been to the nvidia forums multiple times and found little to no support from them, and the drivers seem to be getting worse for the 650m SLI. Maybe it has to do with the refresh rate of the screen, the native refresh rate is like 59.something Hz. Or must just be the double edged sword that comes with mobile SLI's

Hello,

Has anyone had any luck with the Y500 and eliminating stuttering completely? I feel like it is mainly a driver support issue from Nvidia. The 327.23 are the closest to obtaining the best performance on this laptop yet. However, even with vsync on, there is a bunch of flickering and horizontal tearing in games, but no stuttering... It seems like there is always a trade off. Is there a tweak (possibly in BIOS) that can resolve the stuttering issues? It seems like the GPU usage drops on both cards when stuttering becomes more apparent. I have the dual core version of this laptop, the i5-3230m as well. Would this be an example of a CPU bottleneck, if so, how can I confirm this?

Edit: I also recently overclocked my laptop's GPU's and have noticed a significant improvement but not elimination.

I'd say there is a good chance of turning it into a brick without prior knowledge of course. As said previously, it would be a good idea to not to go for large increments right away, but gradually increase the voltage and have a program to simultaneously monitor temperatures when stressing the GPU.

I don't believe it is possible to change the fan speeds manually, even with a modded bios. I've looked into it myself.

I played the beta on the 360 and wasn't too impressed. I'm sure the game is incredible since I am a huge fan of BF3, but I encountered a lot of graphical glitches and server problems. I'm downloading the beta for PC now so I can get a better idea

I would second the Lenovo Y500 650m SLI as well, however performance wise, there is frustration regarding the driver support from nvidia. Not the laptop itself.