NVIDIA GeForce RTX 4080 SUPER vs AMD Radeon RX 7900 XTX
Transient-aware PSU requirements, ATX compliance, cable safety audit, and power efficiency comparison.
| Specification | NVIDIA GeForce RTX 4080 SUPER | AMD Radeon RX 7900 XTX |
|---|---|---|
| Performance Tier | Ultra | Ultra |
| Total Board Power (TBP) | 320W | 355W |
| Transient Peak (modeled) | 461W | 571W |
| Minimum Recommended PSU | 650W | 800W |
| PCIe Connector Required | 12v-2x6 | 8pin-x2 |
| Number of Connectors | 1 | 2 |
| ATX 3.1 Required | ✓ Yes | ✗ No |
| Daisy-Chain Safe | ✗ No | ✗ No |
| MSRP | $999 | $799 |
| Generation | Ada Lovelace | RDNA 3 |
PSU Requirement Breakdown
NVIDIA GeForce RTX 4080 SUPER
⚠ NVIDIA GeForce RTX 4080 SUPER requires an ATX 3.1 PSU with a native 12V-2x6 cable. DO NOT use adapter cables from older 8-pin connectors. If your PSU lacks a native 12V-2x6 port, you must upgrade your PSU.
AMD Radeon RX 7900 XTX
⚠ AMD Radeon RX 7900 XTX 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 4080 SUPER requires less PSU headroom per dollar spent. It needs 650W recommended at $999, versus 800W at $799 for the AMD Radeon RX 7900 XTX.
Note: NVIDIA GeForce RTX 4080 SUPER requires an ATX 3.1 PSU with a native 12V-2x6 cable — factor in a possible PSU upgrade cost if you currently own an ATX 2.x unit.
Frequently Asked Questions
Which PSU do I need for NVIDIA GeForce RTX 4080 SUPER?
NVIDIA GeForce RTX 4080 SUPER has a 320W TBP but can spike to 461W during transient loads. We recommend a minimum 650W ATX 3.1 PSU with a native 12V-2x6 connector for safe operation with headroom.
Which PSU do I need for AMD Radeon RX 7900 XTX?
AMD Radeon RX 7900 XTX has a 355W TBP and transient peak up to 571W. We recommend a minimum 800W ATX 3.1 PSU for stable operation.
Does NVIDIA GeForce RTX 4080 SUPER or AMD Radeon RX 7900 XTX need ATX 3.1?
NVIDIA GeForce RTX 4080 SUPER requires an ATX 3.1 PSU with a native 12V-2x6 connector. Do not use adapter cables. AMD Radeon RX 7900 XTX uses 8pin-x2 and does not require ATX 3.1.