i meanth, in a sense Switch was downclocked meet to Nintendo criteria, by overclocking the console, you get a much higher performance, so my question in regarding Switch sucessor is, will Nintendo downclock the console to meet it specific battery/perfomance criteria, or they keep the normal clock in order to arcive this?
"Downclock" means "go below the standard clock". You cannot downclock a custom chip, because the "standard clock" will be whatever Nintendo wants it to be.
Nintendo will go back and forth with Nvidia. Nvidia will deliver a first "draft" of the chip, in a simulator. Nintendo will have a first "draft" of the Switch 2, that takes that simulator chip and combines it with the specs of the intended screen, blue tooth chipset, joycon design, battery, fan, all of those things.
That first draft will cost too much, and it will be too hot, and it won't be powerful enough and Ko Shiota will probably have a pretty dark day. Then Nintendo will redesign some parts, and go back to their various vendors and as if they
really need to draw this much power, or if there is a fix, and another engineer will look at redesigning the inside to make room for more battery, and they'll do a second draft.
And when they do a second draft, they'll go back to Nvidia and say "We need more performance" or "we need more battery life" and Nvidia will say "well, you should change the clock speed" or they'll say "actually, the clock speed won't fix the problem, we need to change the number of cores" and Nintendo will say "great, but what's that going to do to the cost."
After a while they'll settle on a third draft, and fourth, and a fifth. Eventually those drafts will get off the simulator and will result in sample chips, and those sample chips will go on a breadboard, and be attached to a bunch of off the shelf components or samples of future components for other vendors. And Nintendo will tweak the clocks again and again, shifting the internal design to accommodate the change in heat and battery life.
And finally, Nintendo will have a final chips design and 95% locked clock speed, and Nvidia will not only slap that into the chip as the "default" clock speed, they'll do final adjustment of power curves to make that exact clock speed as optimal as possible.
Nintendo
might alter the clocks past that point, if there is a late stage issue that needs resolving. But it's highly likely that if they do alter the clock speed, it's to dial it up, not down. There is a chance that something goes wrong and they need more thermal room late in the process - it's unlikely they'll get the battery life wrong, but heat is always tricky. And they might adjust clocks down for that.
But the more likely scenario is that developers are in their last pass optimizing a launch game, and can't quite hit 30fps, and someone does a hail mary pass in asking the hardware team for some last minute juice. And probably, at that point, the hardware team says "no." But usually those folks will have built in as much wiggle room as possible, just because it makes the hardware more reliable. Someone will run the numbers and if they can give the software team extra power, but only drop 99% reliability down to 98%, maybe they say yes and the clocks get pushed.
But considering how long this development process has gone on, I truly doubt that's where it lands. Nvidia has a reputation for lots of time on the simulator before sending chips out for sampling. And this hardware team has done 4 versions of the Switch hardware already. I think that they're probably in pretty good shape by the time sampling is coming.