Hey Thanks for that bit of info. I rest my case - Q8400 should keep you well on for some of today's titles...at lower details or lower res'
I wouldn't advise on overclocking the memory but you may see better results by going up to 1333MHz and see if you can pull off 7-7-7-21 @ 1333MHz. You could locate the voltage regulators on your mobo and place some fans to cool the board since it was built to run as is.
2nd advice - pop a GTX 750Ti in there and see what sort of FPS' you get. It should be an interesting piece of cake to have
* are you able to go into BIOS and select some options? Seems like the 1.99GHz Frequency shows up due to a power saving feature (C1 enabled) or its because the ram is at 1066MHz