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Originally Posted by Stephen Fox
Essentially I am looking for a machine that can efficiently process 12Mpx RAW images. Currently I use AMD 2600+ 1GB RAM and 64M graphic card and Nikon capture for RAW conversion. After looking at other RAW converters NC is in my opinion the best for Nikon users. 6Mpx files from D70 are converted easily but the machine struggles with 12Mpx. After receiving great information from another thread on the subject I realise the CPU is a major bottleneck as sits at 100% during the long conversion process. I'll consider anything including MAC to make conversion a joy rather than a pain.
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I would also check your memory and hard disk usage during image manipulation. It might be that the disk is thrashing due to continual virtual memory paging. Control Panel -> Administrative Tools -> Performance monitor will help with analysis. The CPU can be at 100% even though it is paging and/or the disk that is the issue since it performs the i/o operations and byte transfers.