>>127054234
Um... are those songs supposed to be your examples of speed, or power? Because I would consider the first speed metal, and the second power. Though you are completely right in >>127054426.
>>127054666
Not really. IMO there are several styles of speed metal, and some can be very punky while others aren't, besides "punky" =/= hardcore punk specifically. What separates thrash from speed are the chuggy palm muted riffs.