Rambus (RMBS) - Eagle or Penguin Message Board

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 94.16

+2.0%

1:36 PM EST

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next

To: Bilow who wrote (41977)	5/10/2000 7:44:00 PM
From: jim kelley	Read Replies (2) of 93625

Bilow, You are wrong! You have not dealt with my original post. So your post constitutes a misleading reply not a rebuttal. In fact, your response is way off base. My calculations were for the use of DDR in a "PC motherboard" with 128 MB. You are responding with a 32 MB example using DDR SGRAM in a graphics application. It is interesting to note that your calculation yield a point power consumption of 4 X (300 mA X 2.5 V) = 3 Watts for a 32 MB system. A memory with 1/4 the capacity of the one in my example. However, the graphics chip is not suitable for the PC motherboard application. I chose instead the Samsung 16M X 8 chip. By the way, I specified the IDD4r and IDD4w currents from the Samsung specifications. Are you calling those specifications into question? If so why? A simple point calculation of the power consumption for the Samsung 16MX8 chip during a read operation (with Vdd at 2.5 volts nominal) yields 375 mW per 16MX8 chip. It takes 16 of these chips to obtain an 128 bit data bus. That is it takes 6 watts to power the DDR memory. Rdram requires 1.3 watts per chip during the read. Only one chip need be active at a time because each is 16 bits. Now the RIMM situation can get more complicated because RDRAM has a nap mode, a standby mode and as well as an active mode. For 128 MB RIMM doing a read operation we get: NAP MODE---------1.4 Watts Standby mode-------2.6 Active Mode---------4.1 But in all of these cases the power consumption is still below that of an equivalent DDR PC Memory. Now perhaps you have some other example to illustrate your points but currently the ball is in your court. The use of a heat spreader is a good idea since the power consumption of the RDRAM can vary a lot as my example shows. My calculations are approximate. Yours are non existent. :)

Report TOU Violation

Share This Post

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next