Q: What is the difference between PCIe x1 and x4 10G cards?
A: PCIe x1 cards bottleneck at 800MB/s or 6.4Gbps under sustained load due to insufficient bandwidth. PCIe x4 cards like PR27R12 provide 4GB/s bidirectional bandwidth ensuring true 10Gbps full-duplex without packet loss.
Q: Can I use this card in a PCIe x1 slot?
A: No, the card requires a physical x4, x8, or x16 slot. If your motherboard only has x1 slots, consider a USB 10G adapter instead.
Q: Will this work with 2.5G or 5G routers?
A: Yes, the PR27R12 auto-negotiates to 10G, 5G, 2.5G, 1G, 100M, or 10M based on your router or switch capabilities.
Q: What cable do I need for 10G speeds?
A: Use Cat 6A or Cat 7 cable for full 10G at 100 meters. Cat 6 cable works at 10G up to 55 meters. Cat 5e cable maxes out at 2.5G or 5G speeds.
Q: Does this card get hot?
A: No, at 1.79W typical power consumption the card runs cool at 40-50C under load. No heatsink or fan required.
Q: Can I use this with TrueNAS, UnRAID, or Proxmox?
A: Yes, the Realtek RTL8127 driver is included in most modern Linux distributions. TrueNAS Core and SCALE, UnRAID 6.9 and above, and Proxmox VE 7.x and 8.x support this card out of the box.
Q: How do I enable jumbo frames?
A: Windows: Device Manager, Network Adapter Properties, Advanced tab, Jumbo Frame, select 9014 Bytes Linux: sudo ip link set interface mtu 9000 TrueNAS: Network, Interfaces, Edit, set MTU to 9000
Q: What is PTP IEEE 1588 used for?
A: Precision Time Protocol synchronizes clocks across network devices to nanosecond accuracy. Used in industrial automation for robotic arm coordination, financial trading for low-latency timestamping, broadcast video for frame-accurate sync, and 5G telecom base stations.
Q: What is the warranty?
A: 1-year limited warranty with 72-hour stress testing before shipment.
