versh
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Thanks to everyone.
Alan - I tried different combinations, but the result is the same.
sirko9 - I previously attached a cooler to the card (it had passive cooling), and I set the settings to the minimum.
Predvestnik - The processor doesn't seem to overheat, and the video card was cleaned of dust and re-greased with fresh KPТ-8 thermal paste. It feels warm to the touch, but not hot.
In general, I suspect the video card is the problem because I previously had Sapphire 9600 and X1600 Pro cards, and I didn't have these problems with them.
Although, with this 7600 GS, I didn't have any issues in other games, even in resource-intensive ones like S.T.A.L.K.E.R., F.E.A.