4790k in laptop?

I am planning on building another sager laptop with the 4790k desktop cpu in it?

the intel website says the max temps for it are in the 70s while the mobile cpus are 100, yet people are posting and saying they have the desktop cpu in a laptop running max around 90 and no issues? wouldn't the cpu melt or shut the computer down? just wondering how the higher temperatures aren't letting it throttle vs the 70 something degrees it should max at?

also since it's a K unlocked version, how well would it overclock past the stock clocks if the laptop was modded with extra cooling and a laptop cooler and so on? is it even a possibility if a desktop cpu is already hitting in the 90s?

last question- what about how well the cpu runs on battery? i know my current sager with the 4810mq stays around 3.5-3.8ghz plugged in. as soon as i unplug it, it drops down to a steady 1.65ghz on battery. how would the desktop cpu run without being plugged in? would it even work right?

thanks

 

Look at the description for Tcase on Intel ARK: http://ark.intel.com/products/80807/Intel-Core-i7-4790K-Processor-8M-Cache-up-to-4_40-GHz

Remember, mobile CPUs do not have an IHS like desktop CPUs do. So that 74.04C listed for the 4790K is not the maximum allowed core temperature before throttling occurs ( TJmax), which for the 4790K should be 100C just like it is for Haswell mobile i7's.

 

What power plan settings do you have for while you're on battery?


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the full performance one. identical to plugged in

 

Overclocking would depend on cooling, but given the smaller chassis and more restricted airflow, I wouldn't bet on a lot. However, this is without knowing which specific model you're referring to.

Battery performance would depend on how much power the battery can provide. While its capacity is likely somewhere in the ballpark of 90 MWh, the amount that it can discharge at one time is likely to be the limiting factor in performance. If, at full power, your laptop consumes 200 Watts of power, and the battery can deliver that, then you'd have full performance for about 25 minutes. But if the battery can only deliver 100 Watts of power, you're going to have throttling. I don't know what the typical limit is in laptop batteries, but this may well be what you're experiencing with your current laptop.

It's the same thing with electric cars. The limiting factor in how fast a Tesla Model S can travel currently is not the power of the engine, but the amount of drain on the battery. This is limited to 300 KW except for in short bursts to avoid damaging the battery, and as a result limits the speed to about 210 kph (130 mph), as indicated by the orange dotted line in this video:



And while I'm not sure what the typical laptop battery's limit is, I'm pretty sure it's not anywhere near 300 KW!