OCing old cpu
OCing old cpu
You're looking to enhance the lifespan of your old i5 4460 on an Alienware x51 R2 motherboard. Since BIOS updates aren't possible, you'll need software that supports 4th generation CPUs. Options include CPU tuning tools or BIOS modding solutions compatible with your system.
There are indeed chips such as the 4670K and 4790K, but you'd still need a Z87/Z97 motherboard to push them overclocking limits. Since software can't bypass hardware restrictions, you'd be better off using it temporarily or switching to a newer platform for longer.