You can take RMD from any account so long as you take the total amount required by all accounts. Be warned if you don't inform them what you are doing some IRA trustees might automatically payout the RMD. This almost happened to a friend. One bank sent him a letter saying they would send him a check on a certain date. He quickly called them and told them he had already taken his RMD elsewhere and they had better not send him a check without a written request.