I currently had to rebuild a system and 1MB graphic card works just fine with VPX 6. I also have a lousy 4GB of RAM and it runs VPX 6 without ANY issues.
STAY AWAY from VPX 7 as it STILL has issues apparently.
Personally I'm waiting for a STABLE and FINISHED version of VPX (no more updates ever needed and ALL PAST TABLES are backwards compatible) before I tackle the last of the tables I have lined up for the future.
Let's see if it happens which I seriously doubt updates will ever stop.