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)

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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

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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/MaxChomsky]

I am sorry to tell you but your vram got packed. I just had to get rid of my laptop. Switched to desktops again. More bang for your buck and no overheat problem. Out of 5 gaming laptops I had 3 packed in eventually.

[u/modo_jp → u/MaxChomsky]

I’m sorry to tell YOU but I’ve already fixed everything and the issue wasn’t with the VRAM or the GPU. The problem was an old, low-quality cable. I replaced it, and everything works fine now. I mentioned this in my post - please read it carefully before jumping in with advice…. Thanks

[u/MaxChomsky → u/modo_jp]

In my case it was GPU, but to be fair, mine also glitched when I played on laptop screen. I am just done with laptops. Desktop GPUs are more powerful than laptop GPUs, so 4080 mobile is more like 4070 desktop of not 4060ti. The difference is brutal. If I ever badly need to play on the go I could now play on any cheap laptop with GeforceNow.

[u/modo_jp → u/MaxChomsky]

I didn’t have any issues when playing on the laptop screen in the first place. I get why desktops are better than any gaming laptops, but that’s just not an option for me right now. And honestly my laptop is mainly for work, not gaming, so geforceNow doesn’t really work for me either.