Hi. I wanted to upgrade my E760 with Xeon W3680 (6 core) or Xeon x5680 (which one?). 
Can someone help me please?  http://www.evga.com/support/motherboard/legacy/
 
Do you think it's wort spend $160 for old CPU and old PC? Or by new PC?(Then instead $450 (CPU+GPU R9 290X) i need to spend ~~$1500 but will have longer life)
 
Thanks.