In my last article "Add Wow! Performance to your HP EX470 with a Processor Upgrade" I showed you step-by-step how to replace the stock 1.8GHz AMD Sempron 3400+ processor in your HP EX470 with a barn burning 2.6GHz AMD LE-1640 Orleans processor. In the article, I stated that the CPU and system is generally running the same or 2-3 degrees cooler than stock, making the speed increase appear safe.
But how does the new processor hold up under fondue like heat generated by stress test conditions? Will it implode upon itself and supernova? Let's run some test to find out.
To test the CPU under near maximum load conditions to create the most heat possible, I'll be using a free utility called CPU Burn-in. How does it work? According the the website:
"CPU Burn-in constantly cycles FPU intensive functions for a user specified period of time. The resultant calculations are constantly checked for data integrity. If the program detects erroneous data the user is immediately informed."
I ran the application, set it to run for one hour, left the default value of "Enable error checking" and clicked the "Start" button. Here is how the application looks when running:
There is really no visual indication that it is running, so I checked the task monitor and found that my EX470 was at 100% CPU utilization, which is exactly what we are looking for.
Unfortunately, I don't have any "before" values to compare against, but I ran CPU Burn-in for 1 hour and here are the results (as shown in the Windows Home Server Console):
After 5-10 minutes, the CPU held steady at 55-56 degrees Celsius while the system temperature held at only 40 degrees Celsius (which is actually cooler than with the stock processor in idle conditions). Both fans hovered right around 1600 rpm. My office is rather loud anyway, but I didn't notice any increase in sound from the modest 200 rpm increase.
The Bottom Line
According to this web site, the maximum case temperature of the LE-1600 and LE-1620 (the 2.2 GHz and 2.4 GHz cousins on the LE-1640 that we are using) is 69 degrees Celsius. Based on this, our 56 degrees Celsius reading are well within system norms.