NVIDIA GeForce RTX 4070 vs AMD Radeon RX 7900 XTX
Transient-aware PSU requirements, ATX compliance, cable safety audit, and power efficiency comparison.
| Specification | NVIDIA GeForce RTX 4070 | AMD Radeon RX 7900 XTX |
|---|---|---|
| Performance Tier | High-End | Ultra |
| Total Board Power (TBP) | 200W | 355W |
| Transient Peak (modeled) | 341W | 571W |
| Minimum Recommended PSU | 500W | 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 | $499 | $799 |
| Generation | Ada Lovelace | RDNA 3 |
PSU Requirement Breakdown
NVIDIA GeForce RTX 4070
⚠ NVIDIA GeForce RTX 4070 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
AMD Radeon RX 7900 XTX requires less PSU headroom per dollar spent. It needs 800W recommended at $799, versus 500W at $499 for the NVIDIA GeForce RTX 4070.
Note: NVIDIA GeForce RTX 4070 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 4070?
NVIDIA GeForce RTX 4070 has a 200W TBP but can spike to 341W during transient loads. We recommend a minimum 500W 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 4070 or AMD Radeon RX 7900 XTX need ATX 3.1?
NVIDIA GeForce RTX 4070 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.