Thanks for reassuring.... just want to hear what payturr has to say
No problem - I understand your concern and apprehension.
On a Dell Optiplex 755 I changed the E2210 to a Q9550 (Quad core) and also increased the RAM to 4 GBs.
Subsequently I installed Windows 8 Pro 64-bit (upgraded Vista) and upgraded the RAM to 8 GBs (the motherboard limit). No other changes. The performance is incredible!
To further satisfy yourself, check your motherboard specs. and the specs of your particular computer. As long as you stay within the same LGA 775 socket you will do fine.