x58 Xeon x5675 With Faster Than 1333Mhz Ram?

Nov 9, 2018
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I recently acquired a "Gigabyte X58A-UD3R X58 rev1.0" motherboard and was planning picking up a cheap x5675 Cpu. This Cpu I chose because it overclock the best. It can handle ecc/ non ecc memory 800/600/1333 according to intel ark page.
Should I get 1333 mhz ram and overclock it? If Overclocking the ram is the best option would low voltage 1.35V or 1.25V ram be better off?

what ram should I get?
1.5 regular unbuffered ram 1333 mhz
1.5 regular unbuffered ram 1600+ mhz
1.5V Ecc ram 1333mhz
1.5V Ecc ram 1600+ mhz
1.35V Ecc ram 1333 mhz