Hi, i have an old Dell PowerEdge SC420. A02 Bios Version. Service Tag { {SVC TAG REMOVED BY MODERATOR}}.

It has an old pentium 4 520 32 bit cpu, but i've ordered a pentium 4 521 with 64 bit support so i can install a 64 bit linux on it.

I discovered if i put more than 4GB of ram (ddr2) on in, it reports only 3GB, the dangerous bug is when i turn off the computer, the psu and cpu fans start running ultra very fast, like an overpower,  i was really scared so i turned off the power when this happens. I tested this with the 520 and 521 cpu, with 2 different psus, and different ram sticks, all of 1 or 2 gb, using linux, windows, and turning off the computer still in bios. All the times the same pattern has repeated. If do not turn off the power i think that surely the psu or something will blow off. This is really dangerous so it can cause an accident. I don't want support because i understand is an old computer. But if you have a sc420 do not put more than 4gb of ram on it.  This does not happen with exactly 4gb of ram installed.

Sorry for my english. And i don't want trouble just prevent accidents