Palit is a good brand from what I've heard! And yeah I'm not as familiar with it but googling the same thing regarding power limiting/undervolting the 4090 will bring up similar results about optimizing efficiency for it. You can likely get it not exceed 350W under load and likely even get a performance boost, not even regression. The 4090 is incredibly efficient given its performance, it also draws way less power when idling than the 3090 or 3090Ti. Had no idea the price gap was that small haha otherwise I would've recommended the 4090 straight away especially given the price in energy increase you've more than likely experienced