Well Semprons always was an advantage over the celeron's but lol not this much as it is with this.
You're being unfair with the E5200 by saying that, that thing overclocks like mad!Sempron 140 Unlocks to Athlon II X2 - Hardware News - Tech-Reviews
Newegg.com - AMD Sempron 140 Sargas 2.7GHz 1MB L2 Cache Socket AM3 45W Single-Core Processor - Processors - Desktops
This cpu is actually an Athlon II X2 with one core disabled.So, if you get the right motherboard, with a little bit of luck. you can actually turn this single core into a dual core. The Athlon II X2 also overclocks very well. This is a very great deal if you are making an extrememly budget gaming system. The Athlon II X2 3.0GHz beats the e5200.