Bios Mods -The Best BIOS Update and Modification Source

Newbie here. 

I recently received an old e520 with a Pentium D 925, 512mb of ram, and 80 gig HDD.  After powering it up and realizing how much of mistake my purchase was, I immediately went to Ebay and bought Xeon X3230 quad core at 2.66Ghz, 4 more gigs of ram, and plugged in a GTX 650. Plays games comfortably at 40 fps. 

But everyone want what they don't have. Ive been looking for days now on overclocking methods, and none seem to work. BSEL is out of the question as the MOBO only supports an FSB of 1066Mhz. Then I found this site. Ive found about 2 posts on here from about about 6 years ago. Said something along the lines of "You can't unlock a Dell's bios". 

I was wondering if there have been advancement in this field? Do you guys know of anyone who has unlocked a e520? 


Heres the link to my bios. 


http://downloads.dell.com/bios/DM061-020400.EXE


Thanks in advanced

Anyone?

I have a Dell Dimension E520 running QX6800SLACP @ 3.72 GHz. 8GB DDR2 @ 800, Sapphire R9-285 ITX 2GB DDR5. The BIOS hasn't been touched. As a matter of fact I can't enter it at all right now! That's due to a conflict in VESA mode between the Dell BIOS, and GPU BIOS. PNY GTX750Ti 2 GB DDR5 O/C worked perfectly. I posted a tutorial at Tomshardware " Overclocking Dell BTX Computers". Throttlestop software can unlock the voltage and multiplier on LGA775 Core 2 Extreme CPUs. I post as Retrorockit at OCN " LGA775 Club". I might be the only one who's done this so far.
http://valid.x86.fr/bg4n0r