ATI Radeon X800 XT (PCIe) review
Comparing R423 to R420 we see that all the main characteristics of the two chips - process, complexity, configuration - are identical and this is indeed the case. The only difference between the two new high end ATI chips is of course the interface difference, with R420 featuring an AGP8X host interconnect bus interface, whilst R423 replaces this for a 16 lane PCI Express interface.
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By Dave Baumann, Beyond3D
