It’s been a while since we’ve seen ATI and Nvidia scrap it out with two comparably priced cards launching on the same day, but this month they’re right back at it. The Radeon HD 4890 is best seen as an overclocked 1GB Radeon HD 4870 – the architecture is the same and it’s still built using a 55nm process, but ATI has slightly stretched the design to widen the internal copper interconnects and put a crucial few more atoms of silicon between the transistors. The stretched design reduces transistor power leakage and strengthens signal integrity, which in turn allows the chip to run at higher frequencies.
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