In the title and description you will notice it says PC3, which means they are DDR3. FYI If it were to say PC2 that would mean they were DDR2. Hopefully I could help you learn something new. I didn't know that for a while. Thank you for your interest!
This is what my laptop uses, will the item you are selling work for my hp tc1320us? Memory Type: DDR2 PC2-5300, DDR2 (non-ECC) Maximum Memory: 4GB Slots: 2