I have a Feb 2003 1Ghz 17" iMac. Apple states that this model requires PC2100 SO-DIMM for the User Slot. I purchased that from OWC, but they sent me a PC2700 chip. I installed it and the iMac booted and has been working fine (after just 1 day). Is it OK to use this chip? Will any issues arise later? Or does the PC2700 just drop down in speed and everything is fine? TIA.