MSI K9A Platinum ATI CrossFire Xpress 3200 AMD Socket AM2 Motherboard HyperTransport connection to AMD K8 Athlon 64 processor supporting speed up to 1GHz (2000mt/s) Two PCI Express 16x support ATI CrossFire Technology, Two PCI Express slot PCI Express Bus Specification v1.0a compliant Supports two 32-bit Master 3.3v/5v PCI Bus slots Supports 4x 240-pin DDR2 SDRAM up to 8GB memory size