How to Fix Hell Let Loose: Vietnam “Out of Video Memory” Error on High-End Rigs 2026

If there is one thing I hate about launching a new PC game, it is seeing an “Out of Video Memory trying to allocate a rendering resource” error on a machine that should be more than powerful enough to handle it.

That is exactly the situation some players are running into with Hell Let Loose: Vietnam. The game is built around huge 50v50 battles, dense jungle environments, helicopters, river patrol boats, explosions, smoke, and an enormous number of things happening simultaneously. Visually, it can be spectacular. When everything is running properly, this is the kind of military shooter that makes you want to stop and admire the battlefield for a second.

Unfortunately, the same visual ambition can expose problems with Unreal Engine 5, graphics drivers, Windows memory management, shader caches, and unstable hardware configurations.

And yes, the particularly annoying part is that having a powerful GPU does not automatically protect you from this crash. Players with RTX 4080, RTX 4090, and newer RTX 50-series cards can still encounter it.

I spent quite a bit of time looking at the usual causes and testing the fixes I would personally try first on a gaming PC. So, rather than throwing twenty random tweaks at you, this is my practical Hell Let Loose: Vietnam Out of Video Memory fix guide for 2026, focused on the changes that actually make sense.

Why Does Hell Let Loose: Vietnam Say “Out of Video Memory” on a High-End PC?

The error message makes it sound like your GPU has simply run out of VRAM.

Sometimes that is genuinely the problem. But if you’re sitting there with 16GB, 20GB, 24GB or more of VRAM, watching the game crash while Task Manager or your GPU monitoring software shows plenty of memory available, things become a little more complicated.

Unreal Engine 5 doesn’t rely exclusively on your physical VRAM. The engine is constantly moving assets, shaders, textures, geometry and other resources through different layers of memory.

In my experience, these crashes are usually worth investigating from several angles:

The important thing is not to assume the GPU itself is defective just because the error mentions video memory.

Fix #1 — Increase Your Windows Pagefile

This is probably the first thing I would try if the game is crashing despite having a high-end graphics card.

Windows uses the pagefile as additional virtual memory, and demanding Unreal Engine games can sometimes behave badly when there isn’t enough room for large temporary allocations.

I prefer putting the pagefile on the fastest SSD available rather than letting an already heavily used drive struggle with it.

Here are the values I would start with:

To change it:

1. Press Windows Key and search for Advanced System Settings.
2. Open System Properties.
3. Select Advanced.
4. Under Performance, click Settings.
5. Open the Advanced tab.
6. Find Virtual Memory and click Change.
7. Disable Automatically manage paging file size for all drives.
8. Select your fastest SSD.
9. Choose Custom Size.
10. Enter the appropriate values.
11. Click Set, then OK.
12. Restart Windows.

One thing I would emphasize: don’t set the pagefile to an absurdly huge number just because you have plenty of disk space. The goal is to give demanding applications sensible virtual-memory headroom, not replace physical RAM.

Fix #2 — Delete the Game’s Local Cache

This is another fix I like because it is relatively harmless.

If you participated in an earlier build, beta, test period, or simply updated the game several times, old configuration and shader data can potentially become a problem.

Press:

Windows Key + R

Then enter:

%localappdata%

Look for the Hell Let Loose: Vietnam-related folder, such as HLL_Vietnam or HellLetLooseVietnam, depending on the version of the game.

Inside it, look for the Saved directory.

Before deleting anything, remember that this can reset your local configuration, including graphics and audio settings.

If you’re okay with that, remove the folder and allow the game to rebuild its local data when it starts again.

Afterward, I would also verify the installation through Steam:

Steam Library → Hell Let Loose: Vietnam → Properties → Installed Files → Verify integrity of game files

Let Steam finish completely before launching the game again.

Personally, this is one of the first cleanup procedures I use after a major Unreal Engine game update. It takes only a few minutes and eliminates a surprising number of weird configuration problems.

Fix #3 — Test Your CPU and RAM at Stock Settings

This is the fix I would pay particular attention to if you’re running something like an Intel Core i9-13900K, i9-14900K, i9-14900KS, or a high-end Ryzen 9 system.

A game crashing with an apparent GPU memory error doesn’t necessarily mean the GPU is responsible.

Modern games are constantly decompressing assets, preparing rendering data, streaming textures and communicating between the CPU, RAM and GPU. If the system is marginally unstable, the crash can appear in a completely different place from the actual problem.

Start With XMP or EXPO

If your RAM is running an aggressive XMP or EXPO profile, temporarily disable it in BIOS.

Yes, your RAM may have been advertised to run at that speed. That doesn’t necessarily mean every combination of motherboard, CPU memory controller, BIOS version and game workload will be perfectly stable.

Run the game at standard JEDEC settings and see whether the crash disappears.

If Hell Let Loose: Vietnam suddenly becomes stable, you’ve learned something extremely useful.

Check Your BIOS

For Intel systems in particular, I strongly recommend using a current motherboard BIOS with the appropriate CPU stability and microcode updates.

Also check whether your motherboard is using an aggressive automatic power profile.

If you’ve never touched BIOS settings and your motherboard is configured to push the CPU beyond Intel’s recommended operating parameters, switching to a more conservative official baseline can be worthwhile.

I personally prefer a stable CPU over an extra handful of frames per second. There is no point running an enormous processor at aggressive power limits if a multiplayer match crashes every twenty minutes.

Fix #4 — Remove Old Steam Launch Options

This one is especially relevant to veterans coming from the original Hell Let Loose.

If you’ve accumulated launch commands over the years, don’t assume they are still useful for a new Unreal Engine 5 game.

Open:

Steam → Library → Hell Let Loose: Vietnam → Properties → General

Look at the Launch Options field.

If you have commands such as:

• -allavailablecores
• -malloc=system
• old optimization parameters
• experimental rendering commands

I would remove them.

Start with a completely clean launch.

What About DX11?

If the game continues crashing under its default DirectX 12 renderer, you can test:

-dx11

If that produces a significant improvement, it may point toward a DX12-specific driver, shader, or rendering problem on your particular configuration.

However, I wouldn’t automatically recommend running DX11 permanently. If the game is designed and optimized primarily around DX12, the better long-term solution is usually to identify why DX12 is failing rather than stacking compatibility commands on top of the game.

Fix #5 — Don’t Run Everything on Epic

I know, I know.

You bought an RTX 4090.

You want to see Epic everywhere.

I completely understand.

When a new military shooter gives you enormous jungle maps, volumetric effects, smoke, explosions, vegetation and cinematic lighting, the temptation is to turn every slider to maximum and enjoy the spectacle.

But if you’re troubleshooting an OOM crash, this is not the time.

I would start by reducing Texture Quality from Epic to High.

Textures are one of the easiest settings to adjust when you’re investigating VRAM-related problems, and the visual difference between High and Epic can be surprisingly small during an actual 50-player firefight.

Then look at:

• Foliage Quality
• Shadow Quality
• Effects Quality
• Volumetric Effects

You don’t necessarily need to put everything on Low.

For a high-end 1440p system, I’d rather use a mixture of High and Epic settings than destroy the visual quality just to gain a few frames.

If you’re playing at 4K, the difference becomes even more important because native rendering puts significantly more pressure on your GPU.

Fix #6 — Use DLSS or FSR

If Hell Let Loose: Vietnam supports the appropriate upscaling option on your hardware, give it a try.

For NVIDIA GPUs, I would start with:

DLSS Quality

For AMD hardware:

FSR Quality

If you’re still experiencing instability, Balanced can be worth testing.

Upscaling isn’t just about achieving higher FPS. Rendering fewer pixels internally can reduce the workload placed on the GPU, especially during extremely demanding scenes.

And in a game where a jungle firefight can suddenly become a wall of smoke, particles, foliage and explosions, that additional headroom is useful.

Fix #7 — Disable Overlays Before Testing

This is one of those troubleshooting steps that takes almost no effort, so I always recommend trying it.

Temporarily disable:

• Steam Overlay
• Discord Overlay
• MSI Afterburner / RivaTuner overlay
• Other GPU monitoring or hardware-control overlays

If you’re using an aggressive GPU undervolt, overclock, custom fan curve or modified voltage profile, return the card to stock settings temporarily.

The objective isn’t to permanently disable everything.

The objective is to establish a clean baseline.

Once Hell Let Loose: Vietnam is stable, start enabling your applications one by one.

That makes it much easier to identify the actual culprit.

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My Recommended Troubleshooting Order

If I personally had a brand-new RTX 4090 system and Hell Let Loose: Vietnam started throwing the dreaded video-memory crash, I wouldn’t immediately reinstall Windows or start changing ten BIOS settings at once.

I’d do it in this order:

1. Remove all Steam launch options.
2. Restart Windows.
3. Verify the game files.
4. Clear the game’s local Saved/cache data.
5. Disable overlays and monitoring utilities.
6. Set graphics from Epic to High for testing.
7. Enable DLSS/FSR Quality.
8. Check the Windows pagefile.
9. Test RAM without XMP/EXPO.
10. Check BIOS and CPU power settings if crashes continue.

The reason I prefer this approach is simple: change one major variable at a time.

If you change ten things simultaneously and the game stops crashing, you have no idea which fix actually worked.

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A Few Things I Wouldn’t Do

There is plenty of questionable PC optimization advice floating around whenever a popular game launches.

I would avoid blindly downloading registry cleaners, mysterious “FPS optimization” programs, unofficial memory managers or random DLL files.

I also wouldn’t start deleting Windows system files because a YouTube video claims they improve Unreal Engine performance.

And I definitely wouldn’t immediately conclude that your expensive GPU is dying.

If every other game works perfectly and Hell Let Loose: Vietnam is the only title producing an OOM crash, software and configuration should be investigated before hardware replacement.

Final Thoughts

Hell Let Loose: Vietnam is exactly the kind of game I want to see more of on PC. Massive battles, modern hardware, huge environments and the ability to create those ridiculous battlefield moments that you simply can’t get from a small arena shooter.

But ambitious games can also expose weaknesses in PC configurations that remain invisible elsewhere.

If you’re getting the “Out of Video Memory trying to allocate a rendering resource” error despite having a high-end GPU, don’t panic. Your graphics card isn’t automatically running out of VRAM, and buying another GPU probably isn’t the answer.

Start with the boring stuff: clean configuration files, verify the installation, remove old launch commands, increase sensible pagefile headroom, disable overlays and reduce a few extreme settings.

If that doesn’t work, move deeper into the system by testing XMP/EXPO, CPU power profiles and BIOS stability.

Personally, I’d much rather play Hell Let Loose: Vietnam at a rock-solid High/Epic configuration with smooth frame pacing than stare at an Epic preset for ten minutes before getting thrown back to the Windows desktop.

Stable performance wins every time.

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