According to your description, I suggest you refer to the following information:
1. Your machine supports DDR3 1600MHz standard memory, and there are 2 memory slots, each of which supports up to 4G memory and up to 8G memory. You can refer to this specification to upgrade the memory.
2. There is no brand requirement for HP machines to add memory, and adding hardware may be incompatible. If you confirm that the original notebook spare parts can't meet the existing work requirements and want to upgrade the spare parts, in order to ensure the hardware compatibility, it is recommended that you try to contact HP Gold Service Center for consultation on adding the original memory. If you need to inquire about the contact information of HP service center, you can use the following official links to inquire:
/zh/support-drivers/e support/as CPPS . html
Mind you, if you buy memory from a dealer, I suggest you consult the return of incompatible memory in advance.
3. To form dual-channel memory, it is recommended that you use two memory chips with the same capacity, size and frequency specifications. As long as you add this memory with good compatibility, the computer will automatically open dual channels after you add the memory.
4. It has nothing to do with whether the memory is compatible with the machine. When dual channels cannot be formed, as long as the compatibility is good, the machine can work normally. You can decide whether to add 4G memory or 2G memory. If dual channels are to be realized, it is recommended to use the same memory capacity as the standard memory.
5. Tip: If you use 4G memory and a 32-bit system, the actual available memory under the system is about 3G due to memory addressing restrictions. If you are using a 64-bit system, you can identify more memory.
I hope the above reply can help you.
If the above information can't solve your problem, you can log on to www.hp.com.cn/chat,, the online chat room of HP Network, and ask an online engineer to help you solve the problem further. More product information is available in www.hp.com.cn/800..