Up until recently, high-end, let alone upper mainstream cards have been rather scarce. Both ATI and NVIDIA have placed a great deal of focus towards PCI Express and at least as far as some chipset builders are concerned, AGP is dead. NVIDIA's nForce 4 of all flavours, VIA's K8T890 and Intel's 915/925 and higher chipsets are all PCI Express x16 graphics only, and unfortunently for the end user, many of the newer features outside of PCIe are found only on these boards.
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Review:
Viperlair