I have 4 gigs on mine. 4 gigs means i won't have to upgrade for a long time. I will use this system for 5 years and be able to play any game. Save a ton of money on upgrades and go buy lots of candy and books and films.
One of those Mac G5 with 16 gigs of ram should last a long time, especially if you are a school and you can pay 15,000 on a computer once in a blue moon. I quoted this in another thread, but 8 gigs for a 64 bit system is equal to almost zero. Part in red says 17.2 billion gigabytes, 16.8 million terabytes, or 16 exabytes of RAM.
[blockquote]
Most CPUs are designed so that the contents of a single integer register can store the address (location) of any datum in the computer's virtual memory. Therefore, the total number of addresses in the virtual memory – the total amount of data the computer can keep in its working area – is determined by the width of these registers. Beginning in the 1960s with the IBM System/360, then (amongst many others) the DEC VAX minicomputer in the 1970s, and then with the Intel 80386 in the mid-1980s, a de facto consensus developed that 32 bits was a convenient register size. A 32-bit register meant that 232 addresses, or 4 GBs of RAM, could be referenced. At the time these architectures were devised, 4 GB of memory was so far beyond the typical quantities (0.016 GB) available in installations that this was considered to be enough "headroom" for addressing. 4 GB addresses were considered an appropriate size to work with for another important reason: 4 billion integers are enough to assign unique references to most physically countable things in applications like databases.
However, by the early 1990s, the continual reductions in the cost of memory led to installations with quantities of RAM approaching 4 GB, and the use of virtual memory spaces exceeding the 4-gigabyte ceiling became desirable for handling certain types of problems. In response, a number of companies began releasing new families of chips with 64-bit architectures, initially for supercomputers and high-end workstation and server machines. 64-bit computing has gradually drifted down to the personal computer desktop, with some models in Apple's Macintosh lines switching to PowerPC 970 processors (termed "G5" by Apple) in 2002 and to 64-bit x86-64 processors in 2003 (with the launch of the AMD Athlon 64), and with x86-64 processors becoming common in high-end PCs. The emergence of the 64-bit architecture effectively increases the memory ceiling to 264 addresses, equivalent to approximately 17.2 billion gigabytes, 16.8 million terabytes, or 16 exabytes of RAM. To put this in perspective, in the days when 4 MB of main memory was commonplace, the maximum memory ceiling of 232 addresses was about 1,000 times larger than typical memory configurations. Today, when 2 GB of main memory is common, the ceiling of 264 addresses is about ten billion times larger, i.e. ten million times more headroom than the 232 case.[/blockquote]