Spin Blur uses all most of my memory

This kind of thing tends to happen with conflicting dual GPUs. Dual GPUs is always a potential problem.

Try to disable the Intel UHD as per section 6 & 7 here:

https://helpx.adobe.com/photoshop/kb/troubleshoot-gpu-graphics-card.html 

An integrated GPU uses system memory.

In any case, 16 GB isn't a lot. It should work, but you need to watch resources a bit. Plugins, like e.g. Camera Raw, use their own memory outside Photoshop. Probably some of the sub-modules do too.

If you only have the one drive, check its root directory for Photoshop temp files.  If there are any there when Photoshop is closed, you can safely delete them.  Check for the temp files when your 1.57GB document is open. 

I am sure you'll realise these are Photoshop's Scratch Space files.  Open Resource Monitor, and look at drive, CPU and Memory usage while running the Radial Blur.  This is going to tell you what the bottleneck is, and my guess is that it's the drive.  This is especially true with a marginal spec system with just one drive(?) running a process on a large file.

What you can do:

Don't use more than the recommended 70% RAM allocation for Photoshop in Preferences Performance.  Photoshop can use Scratch space when it runs out of memory.  Windows has its Page file, but it will not do well if you starve it of RAM.

Use the appropriate Cache Levels setting.  This can make quite a difference.  I suspect that the last option will work best for you, but try them all.

Reduce your history states to something like 10.

Photoshop is shite at giving up memory, even if you use Edit > Purge > All.  Check this with Resource Monitor. Save your work and restart Photoshop to maximise available RAM.

Use Draft mode until you are happy with the Radial Blur > Spin settings, and then undo it and use a higher setting.

Are you using a laptop? What make and model?

If it has just one drive, what is it?  Can you fit a second drive?