[Sylvester]

1) The 9xl will be more powerful than your 2000xl, it will run safe, but not on a 7020, you really should think of getting a 9920 if your gonna run 20 cells.

2) I dont think it will run to great on 20 cells, if you would consider running on 20, youd have to re-gear it, but it would still run pretty hot, on 20 cells a 9 or even 10xl is good.