dell optiples gx520 ($50 bounty)

[uglyloser]

hello, i am trying to see if i can add features to this bios to disable shadow ram and cache. i have 4 and need to free up memory and this seem like the best way.is there a mod that can give me these options?
thanks in advance.
chris

pay pal will pay asap. :-)

link for bios

http://www.dell.com/support/drivers/us/en/19/DriverDetails/Product/optiplex-gx520?driverId=R142230&osCode=WW1&fileId=2731114925&languageCode=en&categoryId=BI