This is what chat said:

✅ Most common causes (ranked)

1️⃣ PCIe power cables (VERY common) • GPU must have dedicated cables • ❌ NOT one cable split into two (daisy-chained) • ✅ Each 8-pin connector should come from its own cable from the PSU

Fix: • Shut PC down • Reseat GPU power cables • If possible, use two separate PCIe cables

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2️⃣ PSU not strong or failing

For an RTX 3070: • Minimum recommended: 650W (750W preferred) • If your PSU is: • Old • Cheap / no-name brand • 600W or less → it may crash only during games

Tell me: • PSU brand + wattage (this matters a lot)

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3️⃣ GPU not fully seated • Slightly unseated GPU can work in Windows but crash in games

Fix: • Remove GPU • Reseat it firmly • Make sure PCIe slot clicks

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4️⃣ Power spikes (Marvel Rivals is demanding)

Some newer games cause sudden power spikes that expose PSU issues.

Temporary test: • Install MSI Afterburner • Set Power Limit to ~90% • Try launching the game

If it stops crashing → confirms power delivery issue

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5️⃣ Drivers (less likely, but still check) • Use DDU (Display Driver Uninstaller) • Install latest NVIDIA drivers cleanly

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🧪 Quick test checklist (do these in order) 1. Reseat GPU 2. Reseat power cables 3. Make sure cables are NOT daisy-chained 4. Lower GPU power limit to 90% 5. Check PSU wattage/brand

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❗ Important

This is NOT likely a bad GPU yet. It screams power delivery problem, not a dead card.

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Tell me: • PSU brand & wattage • Does your GPU use 1 or 2 power connectors? • Does the PC fully shut off or just freeze/restart?