I guess you swiched from an 1 core processor to a 2 core processor(duo). So you used to have 2.6 ghz and now you actually have about 4.4 ghz in total(first core(2.2) + second core(2.2) ).
And the i7 is a really good processor I think. If I had the cash I'd certainly buy one... So my suggestion is to buy it if you can afford it...
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No, it is not true.
Dual core processors may not have the same performance as a single core processor if the application that you are running does not support multi-core processors.
A single core processor may be faster, but if you need to run several threads of information, the processor has to process one, pause it, continue with the second one, pause it, continue with the third one, etc. a dual core one can take 2 different threads at the same time so if you will se an improvement there.
Since Windows* 2000 Service Pack 4, multi-core processors are supported by the operating system so you will see a performance upgrade within Windows*s as it divide the load between the cores and you will be able to do several things at the same time without affecting the other one.
the Intel(R) Core(TM) i7 Processors are a completely different thing, you cant go wrong with them. The 930 will support triple channel memory that will give you great performance and it is a quad core unit with Hyper Threading that will give you up to 8 threads, this means 8 applications running at the same time!.
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