IPO isn't available to you period. It's a system integrator level setting which isn't available for public use. If you had a system that supported it then it's an either/or because they are mutually exclusive.
You cannot.
That is maximum turbo for the 285K at stock.
That means it's no longer running 200S Boost (at least in a supported manner) because the maximum supported is DDR5-8000.
I think I am reading the same information on the internet as you. There is not that much out there about "Intel Performance Optimizations" and "Intel 200S Boost".
The thing is, I'm running a Gigabyte Z890 AORUS MASTER motherboard and Gigabyte is doing its thing unrelated to what some of these individuals writing on the internet are doing.
I few weeks ago when I updated my Gigabyte BIOS, it looks like the "Intel Performance Optimizations" are now available in the "Advanced" settings. It looks like Gigabyte has incorporated the "Intel Performance Optimizations" in place of the previous "Gigabyte Optimizations". When you select one of the 3 Intel Optimizations, the 3 Gigabyte Optimizations are greyed-out and no longer selectable.
This week when I updated my BIOS again, a new "Advanced" setting called "Intel 200S Boost" is available. When you turn on "Intel 200S Boost", almost all of the hundreds of advanced settings become un-selectable - but, you can still select one the 3 "Advanced" "Intel Default Settings". I selected "Intel Default Settings - Extreme".
The result of this is almost all of the Gigabyte BIOS "Advanced" "Tweaker" settings are set to "auto" and most are un-selectable.
The thing that is a little odd is that my VENGEANCE® 48GB (2x24GB) DDR5 CUDIMM 9200 is initially limited to "only" 4000MHz (DDR5 8000) when it is physically 4600MHz (DDR5 9200 - CU-DIMM). But, somewhere in all of those "auto" settings in the BIOS something apparently auto-sets the memory to running its full 4600MHz speed - which I was glad to see.
Note: "Gear Mode" is set to "Auto" and maybe that overrides the 8000 limit on my 9200 memory.