I'm rebuilding an old dual processor Z800 workstation which has a ton of RAM (192GB) and am thinking of running Boinc with it—among other things. Are there any projects which require a huge amount of ram to run? I've heard that ATLAS LHC tasks would likely be good, but am not sure if there's anything else.

GPUGRID PythonGPU tasks will use about 10 GB of system ram per task, as well as 3-4GB GPU VRAM, and uses several (up to 32) CPU cores also. for each running task. if you have enough VRAM you can run several per GPU.

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I'm rebuilding an old dual processor Z800 workstation which has a ton of RAM (192GB) and am thinking of running Boinc with it—among other things. Are there any projects which require a huge amount of ram to run? I've heard that ATLAS LHC tasks would likely be good, but am not sure if there's anything else.

The Yoyo ECM P2 tasks take a little over 7gb for each task. Th Einstein O3 cpu tasks take about 8gb for each task.

Amicable numbers uses around 8Gb per task (for GPUs)
NFS@Home large tasks use up to 1.25Gb per task as well.