If you really need a new mb, get the gigabyte ep45-ud3r. With this ram and mb running the e8500 you could oc it to 3.8 easily. What OS are you running?
Unless you upgrade to i7 ddr3 is not worth it. Don't get more than 4gb unless your OS is 64bit. Also unless you do a lot of photoshop or similar you will see no speed gain going from 4 to 6gb.
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