Even though the specification of Radeon 4890 is set to 850MHz core clock, some partners will release factory-overclocked versions of the card. They will work at 900MHz for most, but someone might actually even go higher. MSI's R4890-T2D1G-OC is the first overclocked HD 4890 we've come across, and it runs at 900MHz GPU, while the GDDR5 memory is clocked at 1000MHz.

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