оперативки мало..

[quot автор][Remote concurrent file handles
A file server running Windows Server 2003 with 1 GB of RAM can efficiently support approximately 100,000 remote concurrent file handles, regardless of the size of the files. If your users are likely to have more than 100,000 files open at a time, plan to split this load across two or more servers.

File set size
On a file server with 1 GB of RAM, Windows Server 2003 can hold approximately 500 MB of file content and NTFS metadata in memory. (The amount of memory used for NTFS metadata depends on the depth of the directory hierarchy and query distribution, among other factors.) Windows Server 2003 uses the rest of the RAM for providing nonpaged pool and other operating system functions. For each additional gigabyte of RAM that you add, Windows Server 2003 can use the entire RAM capacity for storing file content in memory. For example, a file server with 3 GB of RAM can support approximately 2.5 GB of file content in memory. When the file set size exceeds the amount of memory, files are paged to disk. This paging can result in disk bottlenecks, though using a fast disk subsystem can alleviate this problem.

When determining how much RAM you plan to install in file servers, consider the following guidelines:

• When users typically access the same files, the file set is known as "hot," because the files are frequently stored in memory. For hot file sets, invest in more RAM to accommodate the entire hot file set. Typically, hot file sets are less than 1 percent of the file set, although this figure can vary.

• When users access random files, the file set is known as "cold." For cold file sets, invest in faster disks, because users typically open files that are not already in memory, and the response time is limited by disk latency. For example, if you can cut disk latency in half by using a faster disk subsystem (including number of disks, mechanical speed, and disk cache), compare the cost of doing so to the amount of RAM it would take to achieve similar performance. Using a faster disk subsystem might be less expensive.

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George-IIIКстати, а данные замечания по оперативке распространяются на 2-х канальный режим? Я наверное не написал, что будет 2 модуля по 1024Gb
двухканальность повышает скорость работу самой оперативки а не количество кэшированных в ней данных..

насколько я знаю серверные материнки в основном отличаются количеством слотов и возможностью горячей замены...
(мнение пока ничем не проверенное , так что поправьте если не так)