>There is no single "standard" max frequency for PCB traces, as performance depends on trace design, materials, and the specific application's requirements. However, frequencies above 100 MHz are generally considered high-frequency (HF), requiring specialized materials and design considerations like impedance control, while signals above 5 GHz necessitate even more careful optimization of trace width, spacing, and ground planes to maintain signal integrity.
whereas coax can be a 14 AWG conductor encased in 4 layers of EMI/RFI shielding, and you're having doubt about if this cable is going to rattle the electrons or not let them through quickly enough even if it's just a short length from one device to another device within the same room or the same rack