Tbreak has recently taken a look at the SiS 645DX reference board and were quite impressed by it's performance. Thus we were quite eager to check out some retail boards based on this chipset and one of the first boards that you will be seeing on shelves powered by this chipset will be by ASUS. We received a sales sample of the P4S533 which is not the final board but pretty close to it.
News source: Tbreak
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