14900HX is a base TDP of 55 Watts, up to 157 Wats under Turbo boost.
RTX 4080 is at max 110 Wattts TDP, some peaking at 160 Watts TDP
There is a design consideration when the laptop is being desinged called Total system TDP, since they can only disipate so much heat out of the miniscule heatsinks. Typically between 200 to 280 watts’s. Some vendors sneak higher baselines and slightly larger boots for “Marketing” purposes, but they all fall back quickly to lower TDP after short bursts.
So without knowing the specific laptop you have I can’t tell you.
The problem lies in here; they all come with standard baselines and don’t account for silicone quality. You may be able to get more “umhppphh” out of your system by actually undervolting your GPU to keep total wattage consumed down, letting your CPU have more headroom to stay at its baseline longer.
Look up undervolting for your specifc laptop.
You can even turn off E-cores while gaming to bring that number down lower.
Basicly the CPU has a cap, the GPU has a cap, and the system as a whole, this includes fanc, LCD, and all the bells and whislts are part of that “Total” TDP.
You can try playing around with a program called “Throttle Stop” to see the exact reasons its capping you. The whole idea is to run the minimum required voltage to these systems so they hit what you want them to. Lower voltage means lower wattage, giving you more TDP room. The idea is to use the TDP budget more efficiently.
Get a nice laptop cooler, it really helps.
Undervolt, turn of some e-cores you arent using for much in gaming, and make sure the balanced plan is what you are using (This is important in 13th and 14th Gen Processors). The laptop moves power from one system to the other as needed. Haveing it set to full performance judt causes all the systems to hit their cieling and retreat fast to their base.
As for FPS, the game really doesn’t push pixels that hard at maximum settings fully unleashed mode i can get my 3090 to hit 889 Watts,with wow. My GPU an hit 1,000 watts if I wanted. Pointless, as its jsut pushing you up to a refresh rate your monitor can’t use, and adding to your TDP budget rendering frames that will never be seen. Match your FPS to what your monitor can actually display + maybe 5 more FPS. This makes sure the game isn’t wasting power rendering scences your screen is physically incapable of rendering.
Look into Unervolting and disabling a the E-coreS see where it lands you. Lots of Info out there.