Meh Intel is nice, but in the AMD section the AMD suggestions looked more appealing.
FX-8370 is a good chip. Get a little overclock, maybe 4.7ghz and 1.45v or so..... Very similar to a stock FX-9590. At stock 9590 should pass Prime95s no problem given the cooling is there. Either chip at similar speeds on average will be just as difficult to cool. The only difference is you KNOW for a fact the 9590 will be stable at 4.7ghz and won't need testing at these speeds. Turbo 5ghz is nice little 300mhz jump, leave your power savings and cool and quiet C6 core states enabled and the chip will actually run pretty cool. No reason to actually leave this one on full blast as it's quite capable stock.
Suggestion for 120.2 all in one will not cool a FX-9590 at 5ghz any better than a FX-8350 at 5ghz. You want to build a custom water loop with no less that 120.4 rads and up to 8 rad fans for some decent flow. Always cool VRM package area and enjoy.
My little FX-9590 runs great at stock. I've yet to experience thermal throttling as cooling is good. But keep in mind you won't be easily to cool a 1.5v 8 core AMD cpu.
And for the Intels, well you run into the same issues at 5ghz. Heat. you'll see many many threads on de-lids because of that. Not so much with AMD as they are soldered and not to AMDs benefit either. At least not for overclocking purposes.
For 5ghz chips, I would seriously consider AMD FX-4 core. The FX-9590 EASILY runs 5ghz as a quad because there's a little less wattage to remove. Don't get me wrong, the voltage requirements will still make the chip run warm, again the more Rad the better.
Game last night 5.1ghz FX-9590 4 cores disabled, Cinebench tested and even a quick P95 test just to ballpark load temps. Under 60 was a good figure. 1.5250v. Ram 1067 - 1200mhz np.
EDIT:
About thermal throttling. While trying a FX-9590 on air cooling, I did experience thermal throttling. But I gotta say it wasn't a big hinder on performance, just under load testing.
To add to the throttling of a FX-9590, the first P-state it dropped to is 4.5ghz, then 4.3ghz and then 4.0ghz or something along that line. I don't recall it going much further down because by then I had stopped the stressing. Now if I'm not mistaken that's a throttle down as far as a stock 8350. Are those good numbers?