Hi Alexander! Considering your previous Gamewell-FCI SNAC6 setup, both the HPF-PS6 and HPF-PS6B are excellent choices for a replacement. They are compatible and reliable options for your system. The HPF-PS6B model offers some enhanced features like improved power efficiency and additional diagnostic capabilities. However, if you don’t need those extra features, the HPF-PS6 would be a cost-effective and dependable replacement for your Gamewell-FCI SNAC6. It ultimately depends on your specific requirements and budget. Hope this helps! Let me know if you have any more questions.