The power consumption in FPGA is not only depends upon device type but also on user design. So the max power for Vccint, vccaux etc. all power rails can be estimate by using Xilinx provided power tools XILINX Power Estimator (XPE) or ilinx Power Analyzer (XPA)
XILINX Power Estimator tool helps to customer to estimate the power roughly before your design implementation. Download the XPE Spreadsheet from the following link https://www.xilinx.com/products/technology/power.html for the family (Virtex-4 in your case) you want to use. This page also contains links to Power Estimator guides and White Papers
If your design is ready and & implemented please use Xilinx Power Analyzer (XPA) tool from your ISE tools. Xilinx Power Analyzer (XPA) tool which delivered along with ISE Design pack help to customer accurate power analysis after design implementation.
Please mark this post as an "Accept as solution" in case if it helped to resolve your query. So that it will help to other forum users to directly refer to the answer.
Give kudos to this post in case if you think the information is useful and reply oriented.