I have i5 first gen processor. I need to replace the motherboard. How do I find n buy the motherboard without going to compute

Solution
You won't find this new. It wouldn't be worth replacing the motherboard to keep a seven year old CPU and RAM anyway, which could fail at any time.
A 7th gen core i3 is faster than your current CPU. You could buy a 7th gen Core i3 or i5 with suitable motherboard and RAM, or maybe pickup a second hand CPU, motherboard and RAM that are a few years old (3rd gen onwards would be a decent upgrade).
You won't find this new. It wouldn't be worth replacing the motherboard to keep a seven year old CPU and RAM anyway, which could fail at any time.
A 7th gen core i3 is faster than your current CPU. You could buy a 7th gen Core i3 or i5 with suitable motherboard and RAM, or maybe pickup a second hand CPU, motherboard and RAM that are a few years old (3rd gen onwards would be a decent upgrade).
 
Solution