I've only just started running it again (last time was spring last year), what's happened to it?

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Team AnandTech - SETI@H, DPAD, F@H, MW@H, A@H, LHC, POGS, R@H, Einstein@H, DHEP, WCG

Main rig - Ryzen 5 3600, MSI B450 G.Pro C. AC, RTX 3060Ti 8GB, 32GB DDR4 3200, Win 10 64bit
2nd rig - i7 4930k @4.1 GHz, HD 7870 XT 3GB(DS), 16GB DDR3 1866, Win7

I've only just started running it again (last time was spring last year), what's happened to it?

High CPU usage for GPU tasks.

Oh ok, I didn't notice, I've allocated a core to it anyway.

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Team AnandTech - SETI@H, DPAD, F@H, MW@H, A@H, LHC, POGS, R@H, Einstein@H, DHEP, WCG

Main rig - Ryzen 5 3600, MSI B450 G.Pro C. AC, RTX 3060Ti 8GB, 32GB DDR4 3200, Win 10 64bit
2nd rig - i7 4930k @4.1 GHz, HD 7870 XT 3GB(DS), 16GB DDR3 1866, Win7

Oh ok, I didn't notice, I've allocated a core to it anyway.

Some of the earlier versions of the new app did very little on the GPU. Most of it was done on the CPU. Pretty sad for a GPU app.

Ah yea, that would suck.

But since I've been running E@H, whenever I've checked GPU load it hovers around about 55-60%, although curiously VDDC current is going up & down (giving a graph looking like a castle wall top) from 90-100A down to ~33A.
Not great GPU utilisation, but better than the early apps you describe.

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Team AnandTech - SETI@H, DPAD, F@H, MW@H, A@H, LHC, POGS, R@H, Einstein@H, DHEP, WCG

Main rig - Ryzen 5 3600, MSI B450 G.Pro C. AC, RTX 3060Ti 8GB, 32GB DDR4 3200, Win 10 64bit
2nd rig - i7 4930k @4.1 GHz, HD 7870 XT 3GB(DS), 16GB DDR3 1866, Win7