AMD Radeon RX 7800 XT vs NVIDIA GeForce RTX 3080
Transient-aware PSU requirements, ATX compliance, cable safety audit, and power efficiency comparison.
| Specification | AMD Radeon RX 7800 XT | NVIDIA GeForce RTX 3080 |
|---|---|---|
| Performance Tier | High-End | Ultra |
| Total Board Power (TBP) | 263W | 320W |
| Transient Peak (modeled) | 411W | 561W |
| Minimum Recommended PSU | 600W | 800W |
| PCIe Connector Required | 8pin-x2 | 8pin-x2 |
| Number of Connectors | 2 | 2 |
| ATX 3.1 Required | ✗ No | ✗ No |
| Daisy-Chain Safe | ✗ No | ✗ No |
| MSRP | $449 | $699 |
| Generation | RDNA 3 | Ampere |
PSU Requirement Breakdown
AMD Radeon RX 7800 XT
⚠ AMD Radeon RX 7800 XT requires 2 separate 8-pin PCIe power cables. DO NOT daisy-chain — each cable must run directly from the PSU to the GPU.
NVIDIA GeForce RTX 3080
⚠ NVIDIA GeForce RTX 3080 requires 2 separate 8-pin PCIe power cables. DO NOT daisy-chain — each cable must run directly from the PSU to the GPU.
Power Efficiency Verdict
NVIDIA GeForce RTX 3080 requires less PSU headroom per dollar spent. It needs 800W recommended at $699, versus 600W at $449 for the AMD Radeon RX 7800 XT.
Frequently Asked Questions
Which PSU do I need for AMD Radeon RX 7800 XT?
AMD Radeon RX 7800 XT has a 263W TBP but can spike to 411W during transient loads. We recommend a minimum 600W ATX 3.1 PSU for safe operation with headroom.
Which PSU do I need for NVIDIA GeForce RTX 3080?
NVIDIA GeForce RTX 3080 has a 320W TBP and transient peak up to 561W. We recommend a minimum 800W ATX 3.1 PSU for stable operation.
Does AMD Radeon RX 7800 XT or NVIDIA GeForce RTX 3080 need ATX 3.1?
AMD Radeon RX 7800 XT uses a standard 8pin-x2 connector and does not strictly require ATX 3.1, though an ATX 3.x PSU is still recommended for transient headroom. NVIDIA GeForce RTX 3080 uses 8pin-x2 and does not require ATX 3.1.