If you are fully patched for all the security issues it will probably be more than 20%, my 5930K feels like a ZX80.How much difference from 5820k to 3800x in single core perf? Would i be looking at 20% or so? Not sure whether to go for a lower end 8 core chip.. Don't fancy spending near 500 on just a CPU at the moment and wouldn't mind a couple of extra cores and faster single core perf.