New i7-9700K vs i9-9900K for x265

[paulanderegg]

Looking to build new PC to replace an old Ivy Bridge system. Looking at either the i7-9700K or i9-9900K...basically same chip, one with hyper threading, one without.

For x265 HEVC transcodes, would the hyper threaded in the 8 core i9-9900K add any meaningful transcoding speed advantage over the 8 core i7-9700K? By meaningful, I mean at least 10-15%+. If not now, would it be probable that updates to HB in the next few years might leverage the extra cores and threads more effectively?

The search tool brought up returns for diminishing returns for anything over 6 cores on x264, and lower quality the more threads you throw at a transcode. I figured many might be asking the same question about these new chips, so I am asking here for opinions.

Paul

[s55]

Depends on a number of factors, it certainly won't be significantly faster going from non-hyper to hyperthreading. At best maybe 15%. At worst, it could slow down a little (but you can usually turn it off in the bios if it had a negative impact but that's more an edge case)


Either way, It's not worth a substantial increase in price imo.

[rollin_eng]

First CPU choice will not effect quality.

As far as which CPU the newer one will probably be faster but as far as bang for buck you generally better off going for one or 2 generations old chips.