As a Hungarian I can say we are really mixed. Moesan is right R1a needs to be more specific to speak about Slavic or Turkic. On FTDNA's Hungarian Y-DNA project you can see R1a people who have Hungarian surnames. From the founding of Hungary there were some major cataclisms during our history. The first one was the "tatárjárás", the tatar invasion of our country. Scholars predict it could be that the population was halved. IV. Béla rebuilt the country and introduced many foreign settlers (Italian, German etc.). Then were the Turkish wars, many people died, complete regions were abandoned. At that time we had many refugees from the Balkans as well. After the wars we need more settlers. There were inland settlers, mostly from north Hungary, among them some Slovaks as well, and many Romanians and Vlachs moved to Trannsylvania that time (XVII-XVIII century). Besides them Habsburgs invited a great number of Germans who were exempt of tax-paying for 5-10 years. During Austria-Hungary Budapest became a multicultural city, many Central Europeans moved there. There were a mass migration to Hungary from Russia as well, many Ashkenazi Jewish, and Rusyns come to Hungary. After Trianon Hungary became nearly "pure Hungarian", but also many ethnic Hungarians remained in the old territories of the Kingdom of Hungary. I think modern Hungarians are an admixture of Turkic, Slavic and German people.