no. crossfire 7770 is crap. NEVER start your build with low end crossfire cards. Start with the best single card you can afford, and maybe crossfire if they are at least a mid tier gpu like 7850 or 7870 in the future. not to mention the 7770 is limited in most games including crysis 2 by 1gb vram, which many modern games will fill up, and when that happens it swaps back and forward to system memory giving lower fps and stuttering. you already have a 5870, if crysis 2/3 are going to be your main games than upgrading to a gtx660 or 7870 will give you a good performance boost particularly in dx11 games and is about the same price as 2x 7770's.