I hear now and then about people who have trouble with Second Life crashing their Windows PC from time to time. There are a few reasons why this might occur, but here’s one reason that you might not think of. Heat (or maybe power).

Okay, if you can run Second Life for about 5-15 minutes, and then it crashes, or your machine locks-up, heat or power is a likely candidate for the root of the problem. Now, the Second Life client has a lot of problems, but… here’s what is going on.

On a reasonably new computer while you are normally using it, it will idle down considerably. This draws less power. When you just have your normal windows display up, the 3D portion of your video card is probably turned off, and not drawing power. Your computer probably is drawing around 100 watts or less power while just surfing or playing around.

For example, an AMD X2 (Dual Processor) Athlon CPU draws about 30 watts of power when idling. When it ramps up to full speed it alone will draw up to 120 watts of power. This does not count the memory, support chips, the hard drives, etc.

A 7000 series Nvidia GPU can draw up to 150 watts of power when fully driven, sometimes more. Every watt of power consumed is turned into heat. Your power supply is also not 100% efficient, between 60 and 80% efficient. My PC at home when running Second Life probably draws close to 400 watts of power. This is a lot of heat for a home PC.

Most generic computers you buy off the shelf are not designed for 100% duty cycle for any extended period of time. Worse, as the high rises, electrical resistance rises, producing more heat.

This heat problem is going to manifest itself as being able to run for a while - the system is cool - and then crash after a while - it has over heated. Usually the video card over heats first. So, how do you fix this? Your number one problem is probably dust. Dust impairs the ability of the fans and heat sinks to remove heat. Open up your computer (after turning it off) and blow it out with air and clean it up good. Heat is also the number one killer of computers and hard disks. This is going to go a long way to solving problems. Get rid of the dust. If you smoke around the computer, that makes it worse.

Next, you can try to improve airflow into the computer. Do this intelligently. You want to blow cool air in and take hot air out. Usually, blow in from the front and out from the rear. You may also want to upgrade the CPU cooling unit on your computer. This can be somewhat difficult to do, depending on your computer design. You can find a lot of cooling fans and upgrades from companies like Newegg or Computergate. Buy ball bearing fans, avoid sleeve bearing fans.

Next problem might be an under powered power supply. It may be over taxed and the voltage might be sagging, causing a crash. If it looks cheap, it probably is. On most PCs, you can replace it with a bigger, unit. Newegg also sells power supplies. Look for high efficiency units. Do not buy a fan-less unit, as you are going to run it HOT. A good power supply is a good investment.

Lastly, you might look into upgrades. I’ll talk about that next post.

-Veyron