The GPU was an Intel GMA (from 2008), so it probably would not run shaders at all.6GB RAM is good.
will this support shadows http://www.bestbuy.com/site/Galaxy+-+GeForce+GT+610+GC+2GB+DDR3+PCI+Express+2.0+Graphics+Card/5606876.p?id=1218671140103&skuId=5606876