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In the 648 chipset, SiS has delivered one of the best Pentium 4 chipsets available. Paired up with DDR400 memory, the 648 is faster than anything we've tested except the 850E chipset with PC1066 RDRAM. With DDR333 memory, the 648 isn't always fastest, but it's often close. Not only that, but the 648 showed no significant weaknesses in any of our tests, which is an especially important consideration in third-party Pentium 4 chipsets.