IWILL P4R533-N is performing extremely well at PC1066 mode and once again it prove that i850E should be made to run at PC1066 and not PC800 with the new 533Mhz Pentium 4 processors. However, IWILL P4R533-N at PC800 mode is hit by high memory latency that suffer a little in performance and score lower performance than SiS645DX and Intel 845G at DDR333 mode. Therefore when getting an Intel 850E board, be sure to par up with a good PC800-A RDRAM and run at PC1066 mode and you will definitely get the best performance out of it and make your money worthwhile.