Are there any differences in speed on the various compact flash to IDE adapters that exist? I have heard that some support DMA and others don't? Is it even possible to run an IDE CF card with DMA? I'm looking for an adapter for a Lexar 1GB 40X Compact Flash card. Will it matter for data transfer speed which kind of CF IDE adapter I get for this CF card? Or are all the CF to IDE adapters support the same transfer rate?