|High end games tend to use the video adapter a lot more aggressively. It's normal for the card's video chipset to get hotter in that situation. |
There is usually a setting for adjusting the fan's speed in the software for it - have you found it and increased the speed yet ? E.g. in the ATI Catalyst settings somewhere.
The more air space there is on both the sides of the video card, especially the fan side, the better .
If you have another card in a slot right next to it, especially on the fan side, move that other card to another slot farther way if you can.
However, don't use the last PCI slot of the PCI slots that's nearest the center of the mboard for any card other than a PCI video card, otherwise you're more likely to have problems with the card .
You could install an after market fan on the card that moves more air and cools it better - they're common at local places that have lots of computer parts.
If the case has no case fan install one - the best place is at the back of the case as high up as you can mount it, blowing outwards. If it has one, a larger one will work better. The larger the fan blade diameter, the more air it moves, the quieter it tends to be at full speed.
You could custom rig up a case fan on the bottom of the case so it's mounted close to the video card and blows towards the card's fan side.
If your case has the mounting place, you could mount a case fan on the side of the case so that it's pulling air out of the case away from close to the video card.
On some cases, where you mount a case fan has holes that are too small, or there are not enough of them, and that restricts the air flow of the fan - drilling the holes larger or drilling more holes improves that greatly, but of course that produces tiny bits of metal, so you're better off doing that when the mboard has been removed.
All fans for computers are blowing away from the side where you can see the entire fan blade, and towards the side where you see the non moving center part obscuring the moving blade.
"then my computer display will go black or the computer will shut down."
It's not likely an overheated video chipset alone would cause the motherboard to shut off, but if there is not enough airflow inside the case and the interior of the case is getting way too hot when the card gets too hot, the cpu may overheat too, which WILL cause the mboard to shut off
If your Phenom cpu came in a AMD boxed set with the cpu fan and heat sink included, in my experience usually that AMD supplied cpu fan heat sink combo cools the cpu very well under all conditions, especially if the heat sink has heat pipes on it.
Make sure the cpu fan and cpu heat sink, and the video card fan and heat sink, are not clogged with too much accumulated mung (lint. dust, etc.) . If the room the computer is in has carpet on the floor, if you have the case on or near the floor that mung (lint) will accumulate a lot faster, on the cpu fan and heat sink and on the video card fan and heat sink .
DO NOT use a vacuum cleaner to clean up the mung, unless you can rig it up to blow the mung away without touching anything on the mboard - they produce a tremendous amount of static electricity and touching anything attached to them to a mboard can easily discharge that. Use small artist's brushes, and/or canned air or gas meant for cleaning the interior of a computer. .