Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 107.05

+9.0%

Feb 6 3:59 PM EST

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To: John Walliker who wrote (52871)	9/8/2000 4:53:59 PM
From: Bilow	Read Replies (2) of 93625

Hi John Walliker; Re "You have previously stated that DDR chips use exactly the same die as SDRAM devices but with different metalisation to reconfigure the bus drivers, so why would a chip configured for SDRAM operation use considerably more power?" SDRAM has a power supply of 3.3 volts, while DDR uses 2.5 volts. Power is proportional to square of voltage x capacitance x frequency. Capacitance stays the same, while frequency is proportional to bandwidth, more or less, and we are talking about power per bandwidth. So DDR uses about (2.5/3.3)^2 = 57% of the power of SDRAM for the same bandwidth. -- Carl P.S. I love easy questions.

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