A friend asked me to help him upgrade an HP dv6646us laptop to extend its life a bit since he is clueless about these things. The motherboard is a HP Pavilion DV6000 series AMD motherboard 449903-001. I an not sure what bios it has and he wouldn't be able to tell me. I will be putting in two 2GB sticks of memory to max it out at 4GB total. Currently it only has the stock 2GB in there. He gave me some money and told me to buy whatever I feel is best for it, and then I will install it later. The stock memory, and the memory that comes up as the recommended choice when you search that specific system on the Kingston, Crucial, Corsair, etc web sites, is CL5 memory (5-5-5-15).
However, I found quality, good name brand CL4 memory (4-4-4-12) for the same price as the CL5 and have these questions:
Can CL4 speed memory even be used in this system at all?
If it can, is it because the system can adjust to allow the memory to correctly run at the CL4 speed, or is it because the memory just adjusts to run at the CL5 speed that the system expects it to?
If the dv6646us system can in fact run CL4 speed memory, will the system detect and make the necessary changes needed to run the memory at the CL4 speed automatically, or will bios or other settings have to be manually changed?
Anything else I should be aware of?
I searched pretty extensively and couldn't find a definitive answer on whether CL4 memory can be used with this motherboard and system so any definite information that can be provided is much appreciated. Thanks!