Those are the last laptops you should go for under $500 price tag. Nowdays you can easily get a core i5 or AMD A8 quadcore processor in that price.
If you are a AMD fan go for Acer V3 which got A8-4500M processor running at 1.9 GHz with 4 MB Cache
AMD Radeon HD 7640G Graphics packing 512MB of graphics system memory
4 GB DDR3 RAM.
500 GB 5400 rpm Hard Drive
All this for $429.
Best deals according to me under $500http://bestlaptopsunder500hub.com/best-laptop-under-500-deal-of-the-week.html