According to Benchmark: http://www.cpubenchmark.net/cpu_list.php
The G620 is a much better processor then the Pentium Dual Core E5700.
The clock speed doesn't always stand for how fast it is.

According this http://www.cpu-world.com/Compare/133/Intel_Pentium_Dual-Core_E5700_vs_Intel_Pentium_Dual-Core_G620.html
Each card have it's own good part. But the G620 is much faster in gaming, compressing, rendering videos almost allowing both Multitasking and gaming.

Overall the G620 is a better processor for you to buy since it's performance is greater then the Pentium Dual Core.

http://www.cpu-world.com/Compare/133/Intel_Pentium_Dual-Core_E5700_vs_Intel_Pentium_Dual-Core_G620.html
http://www.cpubenchmark.net/cpu_list.php

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