Ok so I'm wondering whether there is anyway to find out whether my Motherboard will drag down my CPU's performance.
I'm not talking a little bit of drag, I'm just concerned that it might cripple my whole build.
here's my parts list
http://pcpartpicker.com/p/38tNG
CPU: i5-4570
MOBO: asus B85M-E
really need a hand on this one
It won't throttle it. You should ensure that the B85 chipset has features that are suitable for your needs. I think you could probably do a lot more with $800. It's a good build, but you should be able to squeeze a GTX 770 in there. Also, your build is missing a PSU.
http://pcpartpicker.com/p/395a5
Here is a build without a PSU. It's very upgradeable. You could upgrade to an 8350 and that's competitive with an i5, and the FX6300 will give similar performance in most games.