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Originally Posted by Sectus
Well, what is more demanding. Having a few servers with thousands of players each or having thousands servers with a few players each? Every little thing you do in GW is hosted by anet's servers. As far as I know, the bandwidth the client goes through is comparable to other MMORPGs. All in all, I get the impression GW's server model would be just as expensive as any other common mmorpg.
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This is, in fact, a common misconception. A single machine that has more parallel processors and more memory will always be more expensive than a cluster of machines that contains the same number of processor cores and the sum of memory...
For example, the price of one server with 16 cores and half a terabyte (512GB) of RAM is ALOT more expensive than 8 servers, each with 2 CPU cores, each with 64GB of RAM.
Although with the dual core technology, the price of the core has gone down, the price of memory, when going beyond 16GB is still prohibitive.
In terms of distributed system design, an instanced based design (like Anet has) is far more distributable than the unified design of other MMOs. In other words, they are better able to take advantage of many cheap cluster farms with so-so interconnects. In contrast, an MMO where everyone actually shares the same "universe" will require larger serves and faster interconnects, hence more expensive.