Hynix Laptop Memory Memory Chips And Compatibility?

Memory chips and compatibility? - hynix laptop memory

I bought two new chip RAM for my laptop ... that much work. But since I only two slots, I had to remove the two pieces that were already there. (No wonder - I knew that before purchase.) Now I have these old processors.

Can I use them and put them on my old laptop? The machine is a Compaq Presario M2105US. I went to the HP / Compaq site to their "What memory should I buy and use? Service, but the laptop is not on the list ... I think he is too old (I l I bought in 2005) .

In any case, the memory chips that I have two chips of 512 MB (the M2105US it will take a maximum of 1 GB, so that the work is ...). I have no idea what the number of chips, but what he said:
Hynix: 512 2Rx16 PC2-5300S-555-12
Hence follows: HYMP564S64CP6-Y5 AB 0726

And on the back, there are four groups of numbers (and letters):
K000052610
WK731T
P5573100428
PK052005H10

Two questions on this topic:
1) memory chips, which in myOld Compaq?
2) If you can not find # 1, then perhaps you can tell me what would happen if I decided to stay in these chips, and not just to see? If not compatible, I had the computer? Or is only just beginning, and then I'll be back in the original document set?

Any advice would be really useful!
Thank you!