JRT> I was considering buying a small 1-2 GByte flash disk form my system so 
JRT> I was looking over what was available and didn't find what I wanted.

JRT> This should considerably speed up a typical desktop Linux system if used 
JRT> for swap.
JRT> 
JRT> Perhaps SD cards are a better idea.

I thought these devices had a limited number of writes, and thus were a
bad choice for things like swap?

Do you have main memory maxed out?

For swap you don't need non-volatile memory.  There are PCI cards that accept
memory and pretend to be a very fast disk.

JRT> So far I could only find them with DMA 0 which seems to be limited by 
JRT> the card speed.  DMA 0 is 16 MB/sec.  The fastest CF (133x) is 20 MB/s. 
JRT> SDs come slightly faster at 22.5 MB/sec which is still slower than DMA 1.

A 7200 rpm SATA drive does 40 MB/s sustained at the slow end of the platters,
and 65-70MB/s sustained at the fast end.  Are you trying to avoid moving parts?

Product idea:
How about a PCIe card with 8 SATA ports and a documented protocol for NCQ?
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