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Re: A few IDL benchmarck results - question [message #27500 is a reply to message #27406]

Wed, 24 October 2001 11:56

Logan Lindquist
Messages: 50
Registered: October 2001

Member

> A friend who has done a lot of Fortran benchmarking with Pentiums and
> Athlons tells me that there are considerable differences depending on the
> compiler used and the memory subsystem. (DDR vs. RAMBUS?)

I compiled a bunch of information on this a while back, from what I read it
depends on several things. I think that RDRAM has a fast clock speed [how
fast the RAM is able to accept a command from the processor and start] and
is more expensive. Other factors that play a difference are the BIOS chip
that handles data on the motherboard, the Front Side Bus speed processor,
and the Bus speed on the RAM. Thus, my Intel 733Mhz at home doesn't take
advantage of the full speed of the RDRAM because it has a slower BIOS chip
and Bus speed ~ 133Mhz. The new pentium 4's have a 400Mhz Bus speed that is
supposed to use the RAM better.

I don't know the specifics about DDR, but I am pretty sure that it is
limited to AMD systems that pose other potential limitations on speed. I
know that they are running on at least a 200Mhz motherboard Bus now. I do
know that there are two types of memory that vary in clock speed. I think
the faster type is called something like 2600 Mhz which doesn't make any
sense. RDRAM goes up to 800 Mhz which again is faster [ if i understand the
compuer science principles correctly] than the fastest Bus speed out for
Intel. Maybe this is to fill the part of the market that figure the
motherboard industry will upgrade their Bus speeds before they adopt another
RAM standard. I bought 600Mhz!

Hope this helps,
Logan Lindquist

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[Message index]

		Re: A few IDL benchmarck results - question By: Robert Stockwell on Mon, 22 October 2001 02:28
		Re: A few IDL benchmarck results - question By: bowman on Sun, 21 October 2001 06:31
		Re: A few IDL benchmarck results - question By: Logan Lindquist on Wed, 24 October 2001 11:56
		Re: A few IDL benchmarck results - question By: Logan Lindquist on Wed, 24 October 2001 11:58

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