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Paul - It's the former, trying to get W2K to allow more than 2Gb to a single programme (Photoshop) alone. I have very big files - 550Mb typically in 16bit, and using 1.5Gb, you are working with about 1150 in PS or so, you can only get one move before you start writing to scratch disk and then everything slows down terminally. If I can get 2.5Gb out of 3 say, then at least I can make a few moves before things turn to glue. but the RAM limit will prevent this. Do I really need W2K advanced server rather than W2K server? ($$$) Of course, I am going to go for high speed SCSI scratch and OS disks in my next system, which will hopefully make a lot of difference too. I have ATA Raid now, but it's way too slow still. original message: Subject: RE: Win 2K RAM modification Don't bother. According to that KB article, the /3gb switch only shrinks the kernel space from 2GB to 1GB, so that programmers can make sure their device drivers work in that mode, but it doesn't actually increase the user space from 2GB to 3GB unless you're running Advanced Server. So it won't help. But what are you (or whoever the original poster was) trying to accomplish? Give a single application more virtual address space to run in, or give the entire system more physical RAM to run in? If the former, then Win2K Advanced Server would be necessary, and it would be able to do this even if you didn't have that much physical memory, since it's virtual memory that's being repartitioned, not physical memory. If that latter, I'm pretty sure that Win2K Pro can make use of the full 4GB of RAM, which will be shared among all programs in the system, including the kernel, even though a single program can't use more than 2GB. - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.