[J_E_F_F]

OK, with both

over_voltage=2
core_freq=500
gpu_freq=500

it crashes in a couple seconds, and while ssh accepted a reboot command, it was hung so I needed to pull the plug for a reset.
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with:
over_voltage=2
gpu_freq=500

It played for a minute or so, and as soon as I skipped forward, it crashed. This also accepted a reboot command but was hung and required the plug to be pulled before it would reboot.
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with :
over_voltage=2
core_freq=500

I didn't experience a crash