Quoted:
Looking to upgrade on the cheap, general purpose machine, trying to save some cash and use an existing case. I've been out of the game for a while and need some help with a couple questions. Upgrading from a Sempron dual core 2200
Intel I3-4130 Haswell or AMD FX-6300?
Currently leaning on the I3 with this board (need to stay in micro atx range):
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157512&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
Also, current hard drive is a 7,200 RPM SATA 3 gb/s, will this work on a board that just has SATA 6 gb/s?
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The i3-4130 is a fine choice, however I believe the i3-4150 is selling for the same price, if not a few dollars less, so no reason not to go that route.
Also, if "general purpose" doesn't include too much in the way of high-end gaming or multimedia processing, you could save ~$30 bucks and go with the Pentium G3258. I have one in my new build as a stopgap CPU until I can pull the funds together for an i5-4690K, and it works great as it's overclockable (mine is currently at 4.4GHz). Hard to beat for ~$65.
As for the hard drive, if it's more than 4 years old, I'd really suggest upgrading to a new drive. You can still use it, but the reliability on mechanical drives really starts to drop off after the 4-5 year mark. If you want to keep it, I'd look at getting a modestly-sized SSD (those things are amazing!) for your OS drive, and use your old hard drive as a data drive. Just make sure to keep constant backups for the day when the old drive dies.
If you go the i3-4130/4150 route with the mobo you linked, you're looking at ~$175. If you go w/ the Pentium G3258 and the mobo, you're looking at ~$140, and you can throw the extra cash towards a 128GB SSD.
Of course, there are other considerations with old equipment, like the condition of the power supply and the RAM. The RAM you have now may be incompatible with the new motherboard, and you would see significant performance gains by moving to 8GB DDR3. That's another $70.
Upgrading can lead to quite a snowball effect on the wallet!