> A typical DRAM has a transfer rate of approximately 2-20GB/s, whereas typical SSDs have a transfer rate of 50MB-200MB/s. So it's one to two orders of magnitude slower.
I don't think the bandwidth gap is that big-- single WD SN8100 drives (before any potential gain from RAID) already have sequential read speed of >10GB/s for under $200 and 1TB of storage.
A GPU setup with a terabyte of video memory costs a fortune by comparison-- there has to be some kind of reason that people are not trying really hard to make this work, no?