|Are you sure it was the fan on the video card that was making the ratting noise? That could be coming from any fan - the cpu fan, a case fan, a power supply fan, etc. |
Some fans have two sleeve bearings rather than ball bearings, or have one ball bearing, one sleeve bearing (e.g. many fans supplied with Intel cpus have one ball bearing, not so much those supplied with AMD cpus, and in el-cheapo power supplies). When the sleeve bearing gets worn beyond a certain point, it's common for you to hear a rattling noise, the most likely time being after the computer has cooled to room temp and has not been used for a while, e.g. overnight, when you first start up the cold computer.
On the other hand, smaller fans, which have smaller bearings, tend to develop this problem before larger fans do, so even when the video fan has two ball bearings, it may have this problem.
Look up the detailed specs for your video card - you can usually find in that whether the fan has two ball bearings or not. Sometimes you can do the same for other fans.
Note that for any fan used in a computer, if it says ball bearing in the specs for it, or on it's label, not ball bearings with a s, it probably has a ball bearing on the blade side, a sleeve bearing on the other side.
Ceramic bearings are better than ball bearings, and some fans have a sealed lubrication system for their sleeve bearings, e.g. "oil filled" or similar, which is almost as good as two ball bearings if the fluid has not leaked out, but I've never seen either of those except with after market fans.
Minimum system power supply 400 W
HP Pavilion a6750t Desktop PC Product Specifications and Configurable Options
Product number: NE502AV
Power output wattage: 300 Watt
Is that the PS capacity ?
Product Number : NE502AV
Description : HP PAVILION A6760T DESKTOP PC
5188-2625 Power supply - 300-watt (Merlot C) regulated
You need a power supply with more capacity to support using the Radeon 4650 on your system.
If your power supply had a 350 watt capacity, you might have been able to get away with that, but a hundred watt gap between the PS capacity and the recommended minimum for the HD4650 is too much.
Often when your PS does not have enough capacity to support the video chipset being on your system, the card will work anyway when you install it, but the PS is loaded to 100% of it's capacity, or nearly so, and that damages the power supply over time, eventually to the point the system will not work properly when the graphics card is installed, and eventually the PS will fail completely, which can damage other things while failing including the mboard. Plus the fact that HP tends to use el-cheapo power supplies that are much less likely to be able to handle being heavily loaded .
Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD ! )
If that info is not in the ad for the video card, you can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.
If you're a gamer...
In most if not all cases, the max capacity rating of the PS is an intermittent rating. It's recommended that you do not load your PS to any more that 80% of that rating if you are going to be using something that puts a constant load on it, such as playing a recent game for hours on end. In that case, you multiply the min capacity stated for the system with the particular video chipset on the card by 1.25 to find the min. capacity of the PS you should get.
In this case, 400 x 1.25 = 500 watt minimum.
If you need to get a PS with more capacity, you can usually replace it with any decent standard sized standard ATX PS.
Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.
Going by the appearance of your tower case, you probably have a standard sized, standard ATX power supply.
Don't buy an el-cheapo PS.
See response 3 in this: