HomeGPU ComparisonsAMD Radeon RX 7800 XT vs Intel Arc B580
Power Supply Comparison

AMD Radeon RX 7800 XT vs Intel Arc B580

Transient-aware PSU requirements, ATX compliance, cable safety audit, and power efficiency comparison.

SpecificationAMD Radeon RX 7800 XTIntel Arc B580
Performance TierHigh-EndMid-Range
Total Board Power (TBP)263W190W
Transient Peak (modeled)411W308W
Minimum Recommended PSU600W450W
PCIe Connector Required8pin-x28pin-x1
Number of Connectors21
ATX 3.1 Required✗ No✗ No
Daisy-Chain Safe✗ No✓ Yes
MSRP$449$249
GenerationRDNA 3Battlemage

PSU Requirement Breakdown

AMD

AMD Radeon RX 7800 XT

Sustained Draw326W
Transient Peak411W
Min PSU Required600W
Cable Safety⚠ Warning

⚠ 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.

Intel

Intel Arc B580

Sustained Draw241W
Transient Peak308W
Min PSU Required450W
Cable Safety✓ Safe

Power Efficiency Verdict

AMD Radeon RX 7800 XT requires less PSU headroom per dollar spent. It needs 600W recommended at $449, versus 450W at $249 for the Intel Arc B580.

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 Intel Arc B580?

Intel Arc B580 has a 190W TBP and transient peak up to 308W. We recommend a minimum 450W ATX 3.1 PSU for stable operation.

Does AMD Radeon RX 7800 XT or Intel Arc B580 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. Intel Arc B580 uses 8pin-x1 and does not require ATX 3.1.

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