Radeon HD 4890 Review
Radeon HD 4890 is a high-end GPU based on the 55nm, third unified shader architecture, R700.
It's based on the RV790 XT Core and offers 800 Shader Processing Units, 40 TMUs and 16 ROPs a 256-bit memory interface of fast GDDR5. The central unit runs at 850MHz and the memory clock runs at up to 975MHz.
Compared to Radeon HD 4870, it offers slightly extra bandwidth (thanks to the higher operating memory clock), the central unit is higher clocked and features twice as much video memory. However, it also consumes up to around extra 40W. The performance difference between is not very significant.
Most of today's modern games should run fluently at high settings but with modest resolutions. DirectX 11 games aren't supported.
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