VaultxGPU Hits 59x Speedup Over CPUs for Proof-of-Space Plotting

A K=31 Proof-of-Space plot that takes 2688 seconds on a single CPU thread now completes in 45.4 seconds on a GPU. That is a 59.2x speedup, and it beats even the most aggressive 384-thread CPU configuration.

Proof-of-Space Finally Gets a Real GPU Pipeline

VaultX already proved that careful CPU optimization could beat Chia's reference plotter by 4 to 50x using multi-threaded Blake3 hashing. But CPU parallelism has limits. VaultxGPU removes that bottleneck entirely by moving the entire Blake3 hashing pipeline onto the GPU.

The implementation is not a naive offload. Custom CUDA kernels handle the hashing on NVIDIA hardware, while SYCL kernels target AMD and Intel GPUs. Table 1, the intermediate data structure, stays entirely in GPU VRAM. The sort and match stages are fused into a single kernel to minimize PCIe data movement. That architectural choice is the difference between a demo and a production-ready plotter.

Measured Performance That Scales Across K-Values

Benchmarks cover K-values 27 through 31, the typical range for Proof-of-Space plotting. The SYCL GPU implementation hit the 59.2x speedup over the single-threaded CPU baseline. Even against the best multi-threaded CPU configuration (384 threads), the GPU path wins decisively.

These numbers are not synthetic microbenchmarks. They are end-to-end plot generation times, including all hashing, sorting, and matching. The GPU keeps the entire pipeline inside VRAM, avoiding the constant buffer swaps that plague CPU plotters when memory bandwidth runs short.

What This Means for Blockchain Consensus Economics

Bitcoin's Proof-of-Work consumes roughly 150 TWh per year. Proof-of-Space replaces that energy with storage, but slow plot generation has been a practical barrier to entry. VaultxGPU cuts the time for a high-quality plot from nearly 45 minutes (single-threaded) to under a minute. That changes the economics of participation in space-based consensus networks.

The VaultxGPU authors explicitly state that GPU acceleration is "the correct direction for scaling Proof-of-Space plotting beyond what CPU parallelism can achieve." For any blockchain protocol considering a move to Proof-of-Space, the data now backs that claim with concrete speedups, not just theory.

Source: VaultxGPU: GPU-Accelerated Blockchain Consensus
Domain: arxiv.org