NVIDIA GeForce RTX 4080 vs NVIDIA GeForce RTX 3080 Ti
Transient-aware PSU requirements, ATX compliance, cable safety audit, and power efficiency comparison.
| Specification | NVIDIA GeForce RTX 4080 | NVIDIA GeForce RTX 3080 Ti |
|---|---|---|
| Performance Tier | Ultra | Ultra |
| Total Board Power (TBP) | 320W | 350W |
| Transient Peak (modeled) | 461W | 576W |
| 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 | $1199 | $1199 |
| Generation | Ada Lovelace | Ampere |
PSU Requirement Breakdown
NVIDIA GeForce RTX 4080
⚠ NVIDIA GeForce RTX 4080 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.
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 4080 requires less PSU headroom per dollar spent. It needs 650W recommended at $1199, versus 800W at $1199 for the NVIDIA GeForce RTX 3080 Ti.
Note: NVIDIA GeForce RTX 4080 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?
NVIDIA GeForce RTX 4080 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 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 4080 or NVIDIA GeForce RTX 3080 Ti need ATX 3.1?
NVIDIA GeForce RTX 4080 requires an ATX 3.1 PSU with a native 12V-2x6 connector. Do not use adapter cables. NVIDIA GeForce RTX 3080 Ti uses 8pin-x2 and does not require ATX 3.1.