G-Speed es for 4K editing?

Sorry if this is a stupid question on this Forum, but I have multiple G-Speed 8TB arrays (not set up as RAIDS - yet), some of which are 10 yrs old, some are newer. I have previously been using them as eSATA storage for online, HD editing. Migrating to 4K now and wondering if these drive arrays can push data (through esata connections I’d imaging (or?), into my new 4K edit systems. I see the new G-Speed arrays and will move to them, but I have a large investment in these current units and they seem to have some mileage left in them… Any help, ideas, words of advise would be very helpful!