Ключевые различия

• Performance gap is enormous: the Gigabyte scores 35,666 on PassMark G3D vs 8,788 for the RX580, and 19,602 vs 3,438 on GPU Compute. That's roughly 4x the raw performance.
• VRAM and memory tech are generations apart: 16GB of GDDR7 on the Gigabyte vs 4GB of GDDR5 on the Xynsviu. The RX580 will choke on modern titles at anything above low settings.
• Power draw tells the story: the Gigabyte needs a 360W TDP and an 850W PSU, while the RX580 sips 80W and runs fine on a 400W PSU. One is a space heater, the other is basically passive.
• Display outputs are weirdly reversed: the Xynsviu has 6 HDMI ports and supports 6 displays, while the Gigabyte has 3 DisplayPort and 1 HDMI for 4 displays max. The RX580 is oddly better for multi-monitor office setups.
• Real-world sentiment backs the Gigabyte: owners consistently praise its quiet, cool operation and 4K performance, though some gripe about driver instability early on and the card's massive size. The RX580 has only 6 reviews total, so you're rolling the dice on long-term reliability.