Hi everybody, Trying to upgrade C521 to its maximum. It had sempron 1.8, very old bios and 512Mb of ram pc2-4200. It could only run XP and old Ubuntu. I dropped Athlon64x2 2.3GHz, updated bios to 1.1.11 and changed ram to 4Gb pc2-6400. Despite specification says it accepts up to 1Gb dimms in each of 4 slots I dropped 2x2GB dimms in 2 dual mode slots and it works! It runs now w7 and fedora17 as a speed devil And it runs so silently that I even first got scared: fan stopped working! Well, it looks now great but I noticed that the processor runs @ 2.2GHz (should be 2.3) having its capacity of 3GHz. Its current voltage is 1.2v but it should be 1.4v (?..seems to me). Also Vram is 1.8v but it could be up to 2.1-2.2v (?...). However the dell bios (looks like award) has obviously none overclocking options. Is it possible to unlock the bios or use one from different model to get somehow overclocking capabilities?