MSI RTX 3090 is a powerfull top end card that requires 3 power connectors. The card is large and i recommend that you measure your pc case before purchase or like me you will end up having to buy a new one to fit. The card will work with an 850 watt power supply but i would recommend a 1000 watt. I was getting some cold boots while running some high end games but undervolting the card solved these issues and reduced powre consimption by 70 to 90 watts while also reducing thermal temps and actually improving performance. If you want to control the rgb lights then i would recommend free software called openrgb which works great and is an alternative to the one recommended by msi but not favoured by people as its seen as a resource hog, MSI Afterburner is great to run and use though. There are plenty of resources online on youtube or adjusting fan curve etc. The card comes pretty much already overclocked though i believe its still possible to gain some extra fps if needed not that it really is. A great card which will be even greater if you can get it at msrp.