Configurations
Naming of the 700 series of models of the device appears to relate to the size of installed SSD, camera, and battery size. The Eee PC Surf models include the 4400 mAh battery pack and no webcam, while the non-Surf models have the 5200 mAh battery pack and a webcam installed. The model numbers (700, 701) may still be the same as has been seen on pre-production samples. Asus may offer upgrades for the SSD storage via the empty Mini PCIe slot, which has been shown to be labeled FLASH_CON in take apart photos of the 4G. When a Mini PCIe card is inserted into the spare empty slot, the internal SSD gets disabled, making the device unable to boot from the original SSD. There are also signal lines for a USB port on the Mini PCIe pins which have been used to connect various USB devices internally. Some 701 models with serial numbers starting at 7B do not have a second mini PCIe slot soldered onto the motherboard, though the circuit traces and solder pads remain.
In the 70x series, the pre-installed Xandros operating system has a Linux kernel with a kernel option set limiting the detected RAM size to a maximum of 1 GB, even if a larger RAM module is installed. The actual capacity is shown in full in the BIOS setup and under other OSes. However it is possible to recompile the kernel with support for more RAM. The 900 and later laptops had the kernel pre-configured to support up to 4 GB of memory address space.
Read more about this topic: Asus Eee PC, Specifications