Hi Kevin, if you're referring to the AA number on the memory socket mine is: AA H13922-302
Hi Jake - mine doesn't have the H. I have a D54250WYK NUC.
RAM - CRUCIAL CT51264BF160BJ 4GB DDR3L LAPTOP RAM
HDD - SSDMCEAW120A401 Intel SSD 120GB 530 Series (OEM Brown Box) mini PCIe mSATA 6Gb/s 25nm MLC read/write speed 540 MB/s 480MB/s
I have tried removing the HDD and running off USB and the noise was still there. I'm pretty sure it is the NUC generating the noise. I also tried a separate PC with a Gigabyte NVIDIA GeForce GT240 into my amp and it is noiseless when idle, or in Windows moving the mouse or generally using XBMC.