RTX 3090 - any benefit from adding a redundant RTX 2080?

What, if any, are the pros and cons of sticking a perfectly good but unused 2080 into a PC alongside its 3090? Have the card, power supply and cooling can cope, but will it make any significant difference?

I was thinking of transferring the monitor to it and dedicating the 3090 to Cycles. Good, bad or pointless?

TIA
Jeremy

Good.

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