AMD Radeon RX 7800 XT vs AMD Radeon RX 7900 GRE
Transient-aware PSU requirements, ATX compliance, cable safety audit, and power efficiency comparison.
| Specification | AMD Radeon RX 7800 XT | AMD Radeon RX 7900 GRE |
|---|---|---|
| Performance Tier | High-End | High-End |
| Total Board Power (TBP) | 263W | 260W |
| Transient Peak (modeled) | 411W | 401W |
| Minimum Recommended PSU | 600W | 550W |
| 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 | $549 |
| Generation | RDNA 3 | RDNA 3 |
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.
AMD Radeon RX 7900 GRE
⚠ AMD Radeon RX 7900 GRE 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 GRE requires less PSU headroom per dollar spent. It needs 550W recommended at $549, 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 AMD Radeon RX 7900 GRE?
AMD Radeon RX 7900 GRE has a 260W TBP and transient peak up to 401W. We recommend a minimum 550W ATX 3.1 PSU for stable operation.
Does AMD Radeon RX 7800 XT or AMD Radeon RX 7900 GRE 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. AMD Radeon RX 7900 GRE uses 8pin-x2 and does not require ATX 3.1.