533Mhz DDR2 SODIMM in MacBook

[imac9556]

Hi,
I have a 2.0Ghz MacBook Core 2 Duo Notebook. It originally came with 1GB (2x512) DDR2 667Mhz Memory. However, I had some old memory from my old notebook that used DDR2 533Mhz SODIMM Memory. I used those 2 1GB SODIMMS to upgrade to 2GB of memory. However, after 5 Months, I did not realize until now that the memory is 533Mhz, not 667Mhz. Does it make that much of a difference I am using 533Mhz memory? Will I notice a difference if I were to get 667Mhz memory instead? It is working perfectly with 2GB of DDR2 533Mhz SODIMM memory, but am I holding my system back alot?
Thanks, Paul

 

[amt8]

RAM Bottleneck

When you have one module of RAM's speed at one set value of MHz and you only have another module of RAM, but that other module has a lower speed, your system will only be able to run at that lower module's speed. It's like a weakest link in a chain principle. Your computer will bottleneck and only run at the lower speed.

In your case, your system will run as if both are 533 MHz modules.

 

[CanadaRAM]

Well, all of your memory operations are running 20% slower so yeah, it has an impact.

OTOH, if you're happy with the performance, it's probably running a smidgen cooler as well.

 

[imac9556]

Yeah, both are identical samsung chipset memory modules...I guess I might sell them and get a faster rated memory chips...Anyone looking for 1GB Samsung Chipset 533Mhhz DDR2 Memory?
Thanks everyone for your help!