What is the meaning of the letter "J" in Pentium 4 530j? Is it any better or worse than the normal P4 530? Possible meanings. "J" is for: Junk. as in this version is high priced junk compared to the original. "J" is for: Jubilant. as in the feeling you will get after buying this processor. "J" is for: Japanese as in You will need to speak/read it to understand how to use this *** backward processor. "J" is for: Jimmy as in Jimmy the retard's "Speak and Spell" is run by this chip. please let me know. I want to buy the parts by tomorrow and this is the last bit i need to know.