You can participate at Neoseeker.
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OverclockerClub is also doing a giveaway, they have 2 complete gaming systems and 1 HTPC up for grabs:
Once a week for the next four weeks, we will be posting ten questions at the beginning of each week, for a total of forty questions. All answers can be found on the OverclockersClub website. The answers may be buried in threads, they may be right in front of you plain as day, or they might be somewhere in a review. The contest will encompass the entire site, not just the forums. With some questions, we may give some hints throughout the week. These hints will help point you in the right direction, but not get you directly to the answer. Questions which we feel do not need hints will not be included (we reserve the right to deem a question non-hintable). So please, do not ask for hints. All hints have been predetermined by OCC staff.You can participate at OCC.