zkSync Open-Sourced their code, GPU prover support currently requires 40GB of VRAM minimum
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Source found at zksync-era/prover.rs at f5a36684b8c2088d36308bad86643bc7ab3d6a78 · matter-labs/zksync-era (github.com) describes several ProverConfigs, the lowest tier GPU accelerated option they support has a Nvidia Tesla a100 with 40GB of vram - https://gcloud-compute.com/a2-highgpu-2g.html - I was really hoping that the requirements for a GPU accelerated prover would be less, but it looks like you'll be burning through at least $6000/mo to keep a prover up-and-running on zkSync