Hi, i'm a student from Chile(southamerica), first of all, i'm very grateful with you, because you let me know my results of large mip problems. I'm very interested in buy iLOG CPLEX like you, but i don't know what kind of computer do i need for solve my problems?. Generally, they are around of 4000 up to10000 vars and 6000 up to 15000 constraints. So, could you help me? What kind of computer do i need to handle this kind of mip problems (Processor speed, ram memory,etc)? Also, i'm interested in know what computer do you have? thanks for your time and your advice. Regards. -- Atte. Patricio Pastenes A.