“The GeForce 6600 cards (on both interfaces) use cheaper DDR1 memory and are clocked far lower than the GeForce 6600 GT cards. In terms of feature support, both are identical, sans the SLI link for the PCIe version. MSI being NVIDIA’s close add-in-board partner, they were naturally among the early birds to push their cards out to end-users first. However, we are not reviewing MSI’s normal GeForce 6600 cards in this article, but a higher-class Diamond edition.”
Check out the review at HardwareZone.