It depends on the chipset you're talking about. Generally newer cards can go up to about 80 degrees celcius and remain safe. I'd say anything 70 degrees or below and you're fine. Oh and you're perfectly fine with your temperature dropping when you're out of the game. That's a good thing really since the graphics card isn't rendering anything to the display whilst you're tabbed out.
upâ¢stream. 1. toward or in the higher part of a stream; against the current. 2. directed or situated upstream. 3. against or opposite to the direction of transcription, translation, or synthesis of a DNA, RNA, or protein molecule.
At the same time, the Venturi effect causes the static pressure, and therefore the density, to decrease downstream beyond the restriction. Choked flow is a limiting condition where the mass flow will not increase with a further decrease in the downstream pressure environment while upstream pressure is fixed. Note that the limited parameter is velocity, and thus mass flow can be increased with increased upstream pressure (increased fluid density). For homogeneous fluids, the physical point at which the choking occurs for adiabatic conditions, is when the exit plane velocity is at sonic conditions i.e. at a Mach number of 1.