Seek latency is 50x faster and transfer rates are 2 to 5x faster for SSD vs HD. Paging on the SSD is faster. Situations where you would have trashing (i.e. see

Seek latency is 50x faster and transfer rates are 2 to 5x faster for SSD vs HD. Paging on the SSD is faster. Situations where you would have trashing (i.e. seeking during paging) are noticeably faster. If your working set doesn't fit in 4G, it's still going to be too slow.