I'm going to be buying one of these https://www.amazon.com/SunFounder-DS3231-Precision-Raspberry-Arduino/dp/B00HF4NUSS/ref=pd_rhf_gw_p_img_5?_encoding=UTF8&psc=1&refRID=2W3BY4QZJ3XJNV3N1YXX for my Pi in a PS2 Slim project. its small enough and higher precision which is what I care about.