your best bet would be to get a 775 mobo so it can support newer intel cpu there not that pricey brought mine for 40 pounds in the uk
that way you can have this list of cpu#
Intel Pentium G2020
Intel Pentium Processor G2020 (3M Cache, 2.90 GHz). BX80637G2020. Retail box including fan, heatsink and thermal paste.
$65.00
Intel Pentium G2120
Intel Pentium G2120
Intel Pentium Processor G2120 (3M Cache, 3.10 GHz). BX80637G2120. Retail box including fan, heatsink and thermal paste.
$79.00
Intel Celeron G1610
Intel Celeron G1610
2.6GHz, Dual Core, Intel HD Graphics at 650MHz, 2MB Intel Smart Cache. Please be aware that this processor is only compatible with LGA 1155 motherboards. Retail box including fan, heatsink and thermal paste.
$45.00
Intel Core i3 3220
Intel Core i3 3220
Intel Core i3 3220 3.3GHz Dual Core with Hyperthreading (Ivy Bridge), LGA1155, 3MB Cache, BX80637I33220. Retail box including fan, heatsink and thermal paste.
$129.00
Intel Core i3 3220T
Intel Core i3 3220T
Intel Core i3 3220T 2.8GHz Dual Core with Hyperthreading (Ivy Bridge), LGA1155, 3MB Cache, TDP 35W, BX80637I33220T. Retail box including fan, heatsink and thermal paste.
$145.00
Intel Core i3 3225
Intel Core i3 3225
Intel Core i3 3225 3.3GHz Dual Core with Hyperthreading (Ivy Bridge), LGA1155, 3MB Cache, 55W TDP, BX80637I33225. Retail box including fan, heatsink and thermal paste.
$145.00
Intel Core i3 3240
Intel Core i3 3240
Intel Core i3 3240 3.4GHz Dual Core with Hyperthreading (Ivy Bridge), LGA1155, 3MB Cache, BX80637I33240. Retail box including fan, heatsink and thermal paste.
$155.00
Intel Core i5 3330
Intel Core i5 3330
Intel Core i5 3330 3.0GHz (3.2GHz Turbo) Quad Core CPU (Ivy Bridge), LGA1155, 6MB, BX80637I53330. Retail box including fan, heatsink and thermal paste.
$199.00
Intel Core i5 3470
Intel Core i5 3470
Intel Core i5 3470 3.2GHz (3.6GHz Turbo) Quad Core CPU (Ivy Bridge), LGA1155, 6MB, BX80637I53470. Retail box including fan, heatsink and thermal paste.
$209.00
Intel Core i5 3570
Intel Core i5 3570
Intel Core i5 3570 3.4GHz (3.8GHz Turbo) Quad Core CPU (Ivy Bridge), LGA1155, 6MB, BX80637I53570. Retail box including fan, heatsink and thermal paste.
$225.00
Intel Core i5 3570K
Intel Core i5 3570K
Intel Core i5 3570K 3.4GHz (3.8GHz Turbo) Quad Core CPU (Ivy Bridge), LGA1155, 6MB, BX80637I53570K. Retail box including fan, heatsink and thermal paste.
$249.00
Intel Core i7 3770
Intel Core i7 3770
Intel Core i7 3770 3.4GHz (3.9GHz Turbo) Quad Core CPU (Ivy Bridge), LGA1155, 8MB, BX80637I73770. Retail box including fan, heatsink and thermal paste.
$325.00
Intel Core i7 3770K
Intel Core i7 3770K
Intel Core i7 3770K 3.5GHz (3.9GHz Turbo) Quad Core CPU (Ivy Bridge), LGA1155, 8MB, BX80637I73770K. Retail box including fan, heatsink and thermal paste.
$359.00
Intel Core i7 3770S
Intel Core i7 3770S
Intel Core i7 3770S 3.1GHz (3.9GHz Turbo) Quad Core CPU (Ivy Bridge), LGA1155, 8MB, 65W, BX80637I73770S. Retail box including fan, heatsink and thermal paste.
$349.00
Intel Xeon E3 1230 V2
Intel Xeon E3 1230 V2
Intel Xeon E3 1230 V2 3.3GHz (3.7GHz Turbo), Quad Core, 69W TDP, ECC Memory Support, 8MB Intel Smart Cache. Please be aware that this processor is only compatible with LGA 1155 motherboards. Retail box including fan, heatsink and thermal paste.
so I would get a new mobo