Swapping between versions of DX is done in your advanced video settings.

As for an SSD, you can buy a SATAIII model and have it work on a SATAII port at SATAII speeds until you eventually upgrade. Here are some numbers:









Any SSD on that list without the (6Gbps) tag is running at SATAII speeds. Compare that to the HDD in the list (hint: it's in last place). Doesn't really matter whether it's SATAII or SATAIII because it's light years faster than an HDD.