This is just a clarification of my post to other readers who may come across it or find it on the search-engines, when I said "... this CPU has done well 'stock' [no voltage adjustments] at 4.6 gigs ... ", I was of course referring to the literature out there and those users who have successfully overclocked the FX4100, normally rated at 3.6 gigs, to 4.6 gigs. Others but with CPU/memory voltage changes and CPU 3rd party cooler adjustments have gone even higher!
From the available literature on the matter, 4.6 gigs appears to be the max threshold for the FX4100 in terms of running the FX4100 without any voltage adjustments or the need for a 3rd party cooler. That said, some have encountered various issues with the FX4100 at 4.6 gigs so the 'safe' oc setting seems to hover at 4.4 gigs which is not bad on an otherwise 3.6 gig stock chip! If you bring it to 4.4 gigs, you've attained an 800 MHz increase albeit without getting involved in a 3rd party cooler or, more importantly, very tricky CPU and/or memory voltage tinkering which can be fraught with problems. I won't go any further than 4.4 gigs on the FX4100. The machine is stable with no heat nor CPU stress issues with a stock [but thoroughly cleaned of any dust or accumulated gunk periodically!] cooler and using only the BIOS multiplier and the normal procedure OC disablement like AMD Turbo, etc. etc.
I did the OC from BIOS. While I do NOT knock something like the AMD OC software program, and noting for the record that some folks 'have' to use the software approach because their mobo is locked and so they may not have a choice in the matter, I favor the BIOS tinkering approach =IF= , of course, you have an unlocked mobo. If not, then the software approach [like the AMD AOD program] becomes a necessity but if you go that route =or= you go through BIOS, be careful and READ the many excellent tutorials out there on both approaches to overclocking. In short, when in doubt, ASK! And READ! It can save you much grief! BTW, and this to any new folks who are just getting into the world of overclocking --- NEVER take the position that simply because you managed to OC your CPU to a higher rated level that the OC 'per se' allegedly puts you ahead of other 'stock' rated CPU's in terms of performance and speed. This is bosh of the first order! There are lower rated 'stock' CPU's out there [both Intel and AMD, single or multi-core] and NOT overclocked at all that can 'sweep the floor' with the FX4100. The CPU speed increase is merely a 'single' factor when talking about overall CPU and system performance! MUCH depends on the chip you're dealing with itself and various other factors! Just passing it on and with continued thanks to techs and "tinkerers" out there who render the helping hand and the benefit of their expertise and/or "been there, done that" experience . There are still other times where you have to separate the wheat from the chaff when, shall we say, "heightened debates" [!] takes place within a given forum but, hey, it's no secret that for every 'X' who says "this is the ONLY way to go", "Y" will sometimes vehemently disagree [and say so!] while 'Z' comes along and claims that both parties are wrong! ;-)