Quote Originally Posted by Neon Biker View Post
Yes, it's normal for sigle-sided to perform worse than double-sided RAM because of the bank interleave, but the perfromance drop should be minimal.
I would also expect a small drop in speed with single-sided stick, but are these numbers valid in Memtest86?

MBENCH shows similar read/write speed under SSE. Read for INT and MMX are about the same. Write speed is 15% higher.