Download

UE5 needs more memory than UE4?

Does UE5 require more memory than UE4? On one project, I tried to create a large landscape terrain but I got a message about running out of memory and UE5 quit to desktop. My computer has Intel I5 4670 CPU, 16GB of system memory, GeForce GTX 1070 TI GPU, and SSD drives.

The engine should use Windows pagefile (virtual memory) when you don’t have enough RAM. Try increasing it if you have free space on your drives. I think it’s because world partition cutting landscapes in small proxies need a lot of memory. I had to increase my pagefile to 100GB to import a really large tiled landscape without crashing.

Virtual Memory is set at 64GB and page file is set at 48GB. Should I change these settings?

Your RAM is not the issue, it’s your VRAM. Your Graphics card has a very limited amount of VRAM and this is 90% of all headaches, confusion and crashes related to the editor. Your 16GB of RAM should be adequate to run the engine, but your landscape textures are maxing out your GPU.

I’m not sure this is entirely the case, actually. The demo, by all rights, is extremely memory-heavy on both fronts, yet my 2060 Super basically got to the end of it in PIE before crashing (which I’m sure was more to do with loading it off massively slow external magnetic storage than anything). The 1070 Ti and 2060 Super have the same amount of video memory.

Shortly before the engine hard crashed on me, I checked my system memory usage–floating around 20 GB (out of a possible 64 GB in my machine). I’ll have to do more testing but it may not be as simple as “not enough video memory”.

Or it could be… there’s a reason we have all been trying to get a 3090 since it was released.

Either way the new test project lists the required specs. And it is rather memory intensive.

It seems like the new world tiling system thing is just always loading everything in memory when the editor is running.
So since you can’t set it up like in Kite, where you would only load one tile at a time to edit, you are definitely obligated to get more ram, vram and CPU - if the intention is to work on large scale projects…

Note that a 1080ti is barely reaching 30fps almost 4k native for the demo.
On 64ram and the latest i9.

I have a GTX 1060 6Gb and was able to import a 32k resolution heightmap so I don’t think VRAM is the problem here. It took 15 min and 64Gb RAM + almost 100 Gb of virtual memory but it didn’t crash

Open the Windows task manager and highlight “memory” in the performance tab, then look at the “committed” numbers while importing your landscape. If importing the landscape fills all of this memory, then increase your virtual memory.

You can use Diagnostics tools from Visual Studio.


Mine is around ~5.3 gb.

I wrote two big messages detailing my memory usage experiencing a repeatable example of this error… then it was obvious. I looked into my virtual memory settings and found I had it set at 5 GB at some point. (I have 32 GB RAM and a 3090 RTX).

The solution was to up the Virtual memory to a fixed 32GB, and the “no video memory” stopped happening.

There’s the answer. :slight_smile: