alt Hacker NewsSince everyone is complaining about the naming schemes of CPUs, I'll pitch in.
An Intel Core Ultra 7 155U and a Core Ultra 7 155H, are very different classes of CPUs!
If you're comparing laptops, you'll see both listed, and laptops with the U variant will be significantly cheaper, because you get half the max TDP, 4 fewer cores, 8 fewer threads, and a worse GPU.
This isn't to say the 155U is a bad chip, it's just a low-power optimized chip, while the 155H is a high-performance chip, and the difference between their performance characteristics is a lot larger than you'd expect when looking at the model numbers. Heck, if you didn't know better, you might text your tech-savvy friend "hey is a 155 good?", and looking that up would bring up the powerful H version.
And the 285H is lower performance than a 275HX.
Their laptop naming scheme at least is fairly straightforward once you figure it out.
U = Low-TDP, for thin & light devices
H = For higher-performance laptops, e.g. Dell XPS or midrange gaming laptops
HX = Basically the desktop parts stuffed into a laptop form factor, best perf but atrocious power usage even at idle. Only for gaming laptops that aren't meant to be used away from a desk.
And within each series, bigger number is better (or at least not worse - 275HX and 285HX are practically identical).