jacknhut :
Go for the Phenom II X4 965. The FX 4100 is not a true Quad core because in reality it only has 2 physical cores but as counted as 4 modules. The 4 modules share resources and unlike the true 4 physical cores of the Phenom II X4 965. Single thread performance of the FX 4100 is very weak, weaker even than the Phenom II X4 and its multithread performance is equal to the Phenom II X4 (despite the fact that it is a 2 cores 4 modules processors).
um.. i think you have the modules and cores backwards.
fx4100 is not a true quad core. it is a true 2 module 4 core cpu. itis actually an fx 8150 with 50% stuff cut off.
the definition of core is diverse. amd advertises the fx 4100 as a quad core cpu, not a dual module, quad core cpu. again, the 4 cores share resources.
the ph ii x4 is a true quad core in the traditional sense.
@xSpectrum: what is your budget for cpu? since both your chosen cpus will perform similarly in video editing, you could get a hex-core thuban. since amd is rumored to eol the ph ii, you might have no other choice but go with the fx 4100. if you can, get a core i5 2500k/2600 with a gtx 570/radeon6970 if you do video editing regularly ( the gtx is for using with adobe's software). for cpu-intensive tasks, intel will outperform the fx. but if you add gfx cards into the mix, e.g. high res. gaming, the fx and core i5 will perform similarly whenever the gfx load is successfully transfered to the gfx card. the core i5 will have slight lead over the fx.
between fx 4100 and the ph ii x4 965, get the cheaper one. also get a good cooler and psu to keep the power hungry cpu running cool. you might need to oc the fx to 4+ ghz to see some performance improvement.
@Outlander_04: imo none of the zambezi cpus are of good value right now. not to mention they're very power hungry for a 32 nm cpu. i checked a few newegg and microcenter prices where fx 4100 is priced higher than a core i3 2100 ( dual core with ht). it is, however, cheaper than a core i5 or may be the 965. in the end, the value of zambezi depends on what you're comparing it against.