HIS H155HMF128ELN-R Radeon X1550 512MB (128MB DDR2 64-bit on Board) PCI Express x16 Low Profile Video Card - Retail (RoHS) Powered by ATI Radeon X1550 - 550MHz 256MB-128bit / 128MB-64bit 4 channel DDR2 memory - 800MHz 4 Pixel shader processor 2 Vertex shader processor 4 Geometry Pipelines