General RAM upgrade guidelines?
What are limits for upgrading memory? I current have 512MB of PC2700 DDR SDRAM memory (333 MHz) on one of two slots in my Compaq Presario SR1055CL . Can I go to 2 x 1 GB?
How critical is matching the 333 MHz?
You would need to check the specs with HP/Compaq. They will tell you a maximum ram amount for that system. Keep in mind that typically laptops have 2 slots, so you would need to divide the maximum ram amount by 2 to match the ports.
For example:
Your laptop has a Max Ram of 2gb
This means the Max Ram per Slot is 1GB.
If you try to put one 2gb stick in one slot, it will not work as that would be 4gb Max Ram total.