Hi I joined this forum specially for this opinion..I have a pentium 4 with a pci express 1.0 or 1.1..Ih ave geforce 6200TC.It has played most of the games very well under its 250 ram...but recent games like cod 4 asasin creed and others are a problem,but the main problem is lagging,is this becoz of grahics cards or p4 processor? so I basically want to upgrade my card with direct x 9 and xp intact...while i have p4 I also have pentoum intel core 2,but i dont use it much its used by others...but say i want to put anivdia card on both pcs will will be compatabile with both intel core 2 and my p4...and can install the software in both pcs? is it possible? the main reason is i have a lot of clasic games like omikron,deus ex,sands of time pop,which i want to still play so will intel core 2 be backward compatabile?