Hello!
I am running the latest version of BOINC and loaded up tasks for LHC@HOME.
Windows 10 Pro.
I am returning user, having done SETI and Rosetta at home previously.
I have the settings locally set to use no more than 25% of CPU and HDD space.
For some reason, all I am seeing from Task Manager is that the CPU utilization is 5%, but the HDD activity is maxed at 100%.
The HDD is 100% activity with 2 tasks running, if I reduce it to 1 task, the HDD activity drops to about 50%.
What is all the activity for? Shouldn't it be running CPU at 25% at the max, not the HDD?
The nVidia GPU is not used at all, though in preferences it is set to be used at 25%.
Any suggestions on how to not use the HDD, and use the CPU, and GPU would be appreciated!
Thank You!

LHC has a number of different task types so which ones you have running may be relevant. A thought that occurs to me is that if you are short on RAM it may be swapping out to the hard disk and not keeping the CPU fed with data fast enough.

Edit: Afraid I don't know the tools Windows has to see what is going on with RAM very well but Task manager might give some clues.

In later versions of Windows (10 & 11) the task manager has a "performance" tab, one of the sub-tabs is for memory which displays memory usage both as absolute and percentage.
Also the "process" tab can be sorted to show the highest memory or disk processes (this isn't particularly accurate, but does give a good indication).

Finally - the OP says he allows "25% cpu usage" - is this in term of time or percent of number of CPUs? If the former it could be that there is a lot of swapping tasks between disk and memory rather than actually running and doing "real" work.