Hard to predict if those cpus will work with your old Dell board; I would put the money toward a new laptop. You can get one with 4 gb of ram for $399; check slickdeals or fatwallet for daily deals. If the cpu doesn't work, you're stuck with it; they are hard to sell. You will also have to upgrade the cpu heatsink if it does work, which isn't easy to find. You can't buy those off the shelf at newegg. Also you can transfer your old drive to the new one if the adapter plug fits; laptops are proprietary; it makes no sense to upgrade them when new ones are so cheap.
Thanks for the reply. Unfortunately, I need to make this laptop last another year or more. I don't want to invest more than $100.00. I know those processors I mentioned are compatible with this computer using the same heatsink.
Let me rephrase my question: If i'm on Youtube or streaming video, will I notice the difference if I upgrade the processor to one that is 23% faster?