Edit grub before it boots and reduce the number 
Then it will boot, and re-enter the correct amount
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RE: Accidentally set domain memory to 30Gb, system only has 32Gb of RAMposted in Compute
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RE: Is NVIDIA Now Allows GeForce GPU Pass-Through For Windows VMs On Linux?posted in News
The vGPU unlock is far more complicated. Also, it's very likely that it won't be a viable solution on the long run: I'm pretty sure Nvidia will put the authorized features in the card firmware for the next generation.