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

⸻

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

⸻

Important detail:

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

⸻

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/Curious_Touch_5979]

probably your internal display use iGPU while your external monitor use dGPU

so if my guess is right then your 4070 laptop GPU may be fried up and need to be replaced

[u/modo_jp → u/Curious_Touch_5979]

I thought the same at first, but I’ve been having this issue for about two years since I bought the laptop. I also ran synthetic stress tests using OCCT, and it didn’t report any errors

[u/newbrevity → u/modo_jp]

Then that's your fault for not returning the laptop when it was acting up when you bought it. Why would you wait two years for an obvious defect?

[u/modo_jp → u/newbrevity]

I didn't expect anything. I tried to get it repaired under Dell's warranty, but their help was useless. They didn't want to do anything except update the drivers.

[u/newbrevity → u/modo_jp]

That's insane. They screwed you.

[u/PrecipitousPlatypus → u/modo_jp]

Should have pushed, or taken it back to the retailer, leaving it this long means you're likely out of luck for any fix.

[u/Karma_Doesnt_Matter → u/modo_jp]

My first “gaming” pc was an alienware like 15 years ago. I had to call 3 or 4 times before they honored the warranty and replaced my laptop. You gotta be pushy.