In theory it shouldn't. Example... In my desktop, I have an EVGA GTX580 SC video card. The core clock is 800, the Shader clock is 1600 and the memory is 2000MHZ. When the video card is in 2D mode...it runs 200 core, 400 shader and 1200 MHZ for memory. Once it cranks up in 3D...it is at the default settings...and the only thing that changes as the temperatures rise is the fan speed to cool it down. Normal fan speed is around 40% with ambient temps of 40-50C. Once temps rise to about 65C...the fan speed cranks up to 60% and by the time the temps approach 85C...fans are 70%. The idea is to keep the power up and let the fans cool it down to avoid thermal problems. Added aside: In reality...Nvidia releases bios that control the fan speeds. Most of us find their settings inadequate, so we run programs provided by MSI (Afterburner) or EVGA (Precision). These programs give is much more control over fans and let us ramp them up even faster at lower temps. Like uncleweb, the author's name is "Unwinder" Nvidia has acknowledged his work and MSI and EVGA have rewarded him with contracts, where is paid to keep the program up to date and more. Hell...MSI even added an extra applet to theirs, where you can raise the minimum voltage of the video card to force higher overclocks...and MSI, EVGA and Asus all keep full warranties on the cards even if you use the programs. I look at Throttlestop as a CPU version of Afterburner or Precision. It gives you control. What matters here is HOW you use it. If you choose to abuse...you can do damage, as with any program. Used properly...it can be a very useful tool. Too bad computer companies don't give uncleweb a contract... In our computers...coolsense actually kicks in at a certain temperature threshold. Unfortunately, I don't have any data to say what the top fans speed is on our system exhaust...it gets somewhat loud when running full tilt. Not obnoxious or anything...but when plugged in...the CPU isn't running on power limited by a battery...so NO it shouldn't throttle down, unless told to do so. That is why I believe Intel makes recommendations and certain companies live by those recommendations. HP is very conservative. Dell is somewhat conservative. What shocks me is that Asus was the motherboard company that wrote the rule on overclocking and pushing systems to their limits...YET...they throttle their laptops just as much as HP does...odd indeed!