NVIDIA GeForce RTX 3090 vs NVIDIA GeForce RTX 3080 Ti
Transient-aware PSU requirements, ATX compliance, cable safety audit, and power efficiency comparison.
| Specification | NVIDIA GeForce RTX 3090 | NVIDIA GeForce RTX 3080 Ti |
|---|---|---|
| Performance Tier | Ultra | Ultra |
| Total Board Power (TBP) | 350W | 350W |
| Transient Peak (modeled) | 631W | 576W |
| Minimum Recommended PSU | 1000W | 800W |
| PCIe Connector Required | 8pin-x3 | 8pin-x2 |
| Number of Connectors | 3 | 2 |
| ATX 3.1 Required | ✗ No | ✗ No |
| Daisy-Chain Safe | ✗ No | ✗ No |
| MSRP | $1499 | $1199 |
| Generation | Ampere | Ampere |
PSU Requirement Breakdown
NVIDIA GeForce RTX 3090
⚠ NVIDIA GeForce RTX 3090 requires 3 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 Ti
⚠ NVIDIA GeForce RTX 3080 Ti 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 3090 requires less PSU headroom per dollar spent. It needs 1000W recommended at $1499, versus 800W at $1199 for the NVIDIA GeForce RTX 3080 Ti.
Frequently Asked Questions
Which PSU do I need for NVIDIA GeForce RTX 3090?
NVIDIA GeForce RTX 3090 has a 350W TBP but can spike to 631W during transient loads. We recommend a minimum 1000W ATX 3.1 PSU for safe operation with headroom.
Which PSU do I need for NVIDIA GeForce RTX 3080 Ti?
NVIDIA GeForce RTX 3080 Ti has a 350W TBP and transient peak up to 576W. We recommend a minimum 800W ATX 3.1 PSU for stable operation.
Does NVIDIA GeForce RTX 3090 or NVIDIA GeForce RTX 3080 Ti need ATX 3.1?
NVIDIA GeForce RTX 3090 uses a standard 8pin-x3 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 Ti uses 8pin-x2 and does not require ATX 3.1.