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One thing I've been wondering about for quite som time is that how can you determine system requirements when you want to release your finished game/application. The amount of RAM needed I guess you can just calculate all the data/objects you're using and in that way find out thw total RAM they'll be using. But how about CPU, GPU and stuff like that? You can't tell just by looking at your code, right? Ofcourse you can test run the software on different machines.

Maybe you also can do this in other ways? Anyone knows?

Best!

Typically I think they are just general estimates based on test hardware - calculating specific requirements would be rather difficult (especially since resource consumption is rarely constant in games when shifting between levels or visible content).

I found that on my system I am able to disable additional CPU cores and under clock my CPU, which is pretty handy, although it is a relatively modern CPU, you cannot account for missing SSE technologies and such, but it would allow me to test against certain CORE numbers and GHZ specifics, meaning I can test say against a modern Single Core CPU performance, and DUAL core... as well as QUAD, I am aiming to get hold of an Octi Core CPU soon...

I can also disable turbo boost to keep the performance test constant... to some extent...

But the best method is to have three current types of common systems that are being sold on the market...

NETBOOK
LAPTOP
DESKTOP

And picking the Netbooks and Laptops featuring only INTEL Integrated Graphics should allow a consistent test for the majority of setups, and you can put that clause in your requirements, Intel Graphics tested and recommended...

For your Desktop setup, get one with integrated Graphics so that you can test against Add-In GPU and Integrated as most of the systems sold to consumers today use the Integrated Graphics based on Intel CPU chips... i3/i5

Just to be on Balance, you may want to get some ATI based ones too, but I think the Intel based ones sell more...

Hope this makes sense and is relevant...