It may be helpful.
 
Unfortunately, since my last entry returned freeze but I have found the cause.
It turns out that the cause is EVGA Precission.
Program while increasing the value of "gpu clock offset" At the same time results in lowering the GPU voltage on standard operating frequencies of these cards without boost (for my 2 cards GTX 780SC is 967MHz).
I give examples cards GTX 780SC:
gpu clock offset 0 - at 967MHz core voltage is 1037mv,
gpu clock offset 30 - at 967MHz core voltage is 1012mv - possible freeze
gpu clock offset 40 - at 967MHz core voltage is 1000 mv - freeze
Of course, when lifting the gpu clock offset increases maximum turbo boost mode for the card in which it operates correctly.
GTX 780 FTW card on a standard 980MHz clock has a voltage 1012mv and despite the fact that the clock is higher than the 780 SC in this tab are not completely freeze.
And all my 3 cards operate in a 3-way SLI (1xGTX 780FTW and 2xGTX 780SC).

That's why my card did freeze on older games that do not affect their up and do not cause the boost mode, because the core was then too low voltage!
With games like Crysis demanding III and benchmarks, when the cards were used up there is not crashed since then the core of getting the correct voltage.
I reported this bug to EVGA as soon as possible and expect the relevant amendments in the next version of the software.
We can not have that, along with raising the gpu clock offset voltage is reduced at lower frequencies card work because what then is the point at all the owerclocking..

To sum up my computer is all in the greatest order, and described EVGA software defect caused me a lot of worry and a lot of time spent to find the cause of crashes games, instead of enjoying the purchase of new high-performance graphics cards.