Patience, Grasshopper. Couldn't resist.
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This should be your first stop.
HOWTO: Overclock C2Q (Quads) and C2D (Duals) - Guide v1.6.1
http://www.tomshardware.com/forum/240001-29-howto-overclock-quads-duals-guide
Shadow's Gigabyte motherboard OC guide:
http://www.tomshardware.co.uk/forum/page-245679_11_0.html
It's for an EP35-DS3L but all the Gigabyte Core2 BIOS's are similar.
Go through the guides. Then first thing you should do is go into the BIOS and change the System Memory Multiplier from AUTO to 2.00B or 2.00D - whichever you need to set the Memory Frequency to twice the FSB. Then when you increase the FSB, the memory clock will rise in step with it.
Warning - confusion factor between what the BIOS calls things and what CPUZ calls things. What the BIOS calls "memory frequency" is actually the memory clock. What CPUZ calls "memory frequency" is half the memory clock - DDR2 RAM, remember? It transfers two chuncks of data each bus cycle. What you want in CPUZ is a 1:1 FSB:RAM ratio.
Overclocking memory doesn't accomplish much besides limiting your CPU overclock where the real speed comes from.
BTW, I have found Intel Core2 Gigabyte motherboards pretty easy to overclock.
System summary:
GA-EP45-UD3P | Q9550 OC'd to 3.6 GHz (425 MHz X 8.5) C3 stepping
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GA-EP45-UD3L | Q6600 OC'd to 3.6 GHz (400 MHz X 9)
GA-EP35-DS3P | E5200 OC'd to 3.78 GHz (315 MHz X 12)
GA-G41m-ES2L| E5200, stock, on loan to sis-in-law
Or maybe I am just really familiar with them.