I think processor throttling in general is not a Lenovo problem - but a Intel problem. But insisting stuffing in a dedicated graphics card, in a ultrabook design, in a 14" case - should cause any kind of problems, and expected lifte time below 3 years.
Apparently the new Ivy Bridge processors - with 3D transistor technology - runs hotter than last years Sandy Bridge, even they should in theory run cooler. Whether this is cause the faster HD4000 or the new 3D technology, only Intel knows.
I think the Intel Ivy Bridge processors is a flop - the flop of the year - unfortunately, since we which no harm to Intel, just cool ( cooler ) running x86 processors, ( markets has been screaming for a decade to Intel, but they dosnt listen till they recently whoked up and say a tablet market running without them ) and thereby cooler running notebooks, and thereby longer life time, better reliability, longer battery life, less contribution to the global heating and energy consumption.
Also Lenovo seems to be flopping this year - continuing to both stuff unnecessary dedicated graphics cards in, but also continue with glossy screens. Having a G570, i5-2410M, is a pleasure (exept for the very reflecting screen ), which I finally after much seeking found without a dedicated graphics card last year.
Now, we need a cuple more notebooks, but last years Sandy Bride are with refelective screens, this years are not, but running too hot, and difficult to tyrack one down without dedicated graphics card ????? ThinkPad is a bit expensive, and shouldnt be neccesary to buy a ThinkPad to get a matte screen.
However, even in the business line of Lenovo they like to stuff in a dedicated graphics card - in a 14" ?!:-( For what will a business user need a dedicated graphics card on top of a HD 4000 ?! :(