A mid-2007 MacBook is still very usable but suffers from three performance limitations: limited RAM capacity, limited video performance, and a 1.5Gbit/second SATA hard drive speed.
The maximum RAM addressed by the mid-2007 MacBook is 3.3GB with 4GB installed (two 2GB sticks). Mid 2007 MacBooks came with just 1GB installed. That limits the number of application programs you can run simultaneously: Web browsing with just a couple of windows opened, and another app or two, or performance will slow as the OS begins paging the contents of RAM out to the hard disk. As available free RAM diminishes, you see frequent 'Beachballs' the colorful spinning icon and the system slows dramatically.
The video performance is quite modest ("slow") because of the GMA 950 video chipset with a total of 64MB VRAM, not upgradable. It means that viewing streaming YouTube video or using Skype is certainly possible, but it will cause the internal fan to run at high speed most of the time. If you don't have at least a 10MBit/sec internet connection, video will often 'stutter' or halt and buffer before continuing. Even then, it's far from optimum on a wireless connection. I used my mid-2007 2.16Ghz MacBook to FaceTime or Skype with my son during his four years of college, and it worked very reliably, but the fan ran at max speed the whole time.
The 1.5Gbit/second SATA hard drive interface means that even though a SSD (solid state drive) will fit, you won't get the full benefit of the performance it offers, though still MUCH faster than installing a traditional hard drive with rotating platters.
OS X 10.6.8 "Snow Leopard" runs nicely in 3.3GB RAM, and is still available from Apple on CD media for $20.
Be sure to ask the original owner to include the two Apple discs that shipped with the system.
I recommend visiting OtherWorldComputing to see what is available and then decide whether you want to accept the 'gift' and how much you might want to invest in upgrades.
http://eshop.macsales.com/MyOWC/
Message was edited by: kostby