but if you change 1bit of data, its a whole page read-write-assign ready for erase for an ssd, for a hdd it just changes that bit, once it finds its logical block. Hence for changing data at only a bit level ssd's aren't great, where data is being changed in bulk they are just as 'efficient' as hdd's. hence why I think that for pagefile they are not a great choice. I have 2x30GB OCZ solids, which I was using 1 for pagefile, the other for scratch. these are pre-trim and it choked and caused a blue screen. In a nearly full ssd with trim and little provisioning, the same could happen where the drive responds slowly whilst waiting for trim to kick in, or some garbage cleaning to work.