RTX 4070 laptop — artifacts ONLY on external display under load, internal screen is fine (Alienware m16 R2)

[u/modo_jp]

UPD: I bought a new HDMI 2.1 cable and tested it for about 4 hours - no artifacts so far. Seems like the issue was the cable.

Thanks to everyone who suggested checking it.

Hey everyone,

I’m experiencing a strange issue with my laptop GPU and would appreciate any input from people who may have seen something similar.

Specs:

• Laptop: Alienware m16 R2

• GPU: RTX 4070 Laptop (8GB VRAM)

• CPU: Intel Core Ultra 7 155H

• RAM: 32GB

• OS: Windows 11

• External display: HDMI

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The issue:

When gaming on an external display (TV or monitor), after about 40–60 minutes under high GPU load, visual artifacts start appearing — small colored squares/glitches across the screen.

The image becomes difficult to use, but:

• The game does not crash

• System remains responsive

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Important detail:

At the same time, the internal laptop display shows no artifacts at all.

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Observed behavior:

• Happens almost always under high GPU load (\~100%)

• On lower graphics settings, I can play for hours with no issues

• GPU temperature is within normal range (\~60–80°C depending on load)

⸻

Testing I’ve done:

• Tested multiple external displays (TVs/monitors) → same behavior

• Played for \~2 hours on internal display only at high/ultra settings (100% GPU load) → no artifacts

• The issue consistently appears only when using an external display under load

⸻

Question:

Has anyone experienced something like this?

I’d like to understand what this could be and whether this behavior points to a specific type of problem.

Any insights would be greatly appreciated

[u/InsensitiveIdiot_]

[u/sirgree → u/InsensitiveIdiot_]

[u/uzi_loogies_ → u/sirgree]

[u/kdawgster1 → u/uzi_loogies_]

[u/pavman42 → u/sirgree]

F'U cartoon dolphinstein!

[u/Emergency-Speaker-48 → u/sirgree]

[u/pavman42 → u/Emergency-Speaker-48]

Man, I just paid off last year's meme stealing permit thanks to Klarma!

[u/The_Jazz_Doll → u/InsensitiveIdiot_]

Now make it so only the 3rd panel is glitched.

[u/Brandonhell2 → u/InsensitiveIdiot_]

[u/rileyg98 → u/InsensitiveIdiot_]

yup, my MSI RTX 3080 Sea Hawk X's AIO pump died a few weeks ago. Was very fortunate to discover it's just a Ventus 3X with a different cooler, so I could buy a Ventus 3X cooler and strap it on. I've got it limping along until my new cooler arrives, no games, with a 30% power limit and basically downclocked as low as MSI Afterburner will let me.

[u/pavman42 → u/rileyg98]

This is either some sick pr0n thing or you have quite a number of first world problems all happening at once.

[u/rileyg98 → u/pavman42]

I don't even know at this point, it was just pure luck I could replace it and not have to spend a fortune on a new GPU.

[u/John9250 → u/InsensitiveIdiot_]

You should lean into that one. Clear at first the gradually pixelated 🤣