- Original Message -
From: "Brian J. Beesley" <[EMAIL PROTECTED]>
To: "Marc Honey" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Tuesday, August 27, 2002 7:27 AM
Subject: Re: Mersenne: 266 vs 333 ddr on Athlon
> On Tuesday 27 August 2002 02:08, Marc Honey wrote:
> > Anyone else notice that a kt333 Athlon board using an Athlon XP gets
better
> > performance at 266 than at 333? I was amazed at the difference, and yes
I
> > tweaked out the bios under both memory speeds. AMD really needs a fsb
> > speed update!
>
> Weird. Possibly your 266 MHz DDRAM is CL2 but your 333 MHz DDRAM is CL3.
Or perhaps it's the asynchronous operation of the memory, which may increase
latency. The increased memory speed per se does not help, because bandwidth
is limited by the 266MHz FSB. I would suggest that the memory controller is
the issue here. What chipset?
> Also, I have two near-identical systems using 1.2GHz T'bird Athlons in
> Abit KT7A mobos, with CL2 PC133 memory. The only difference is that one
> of the CPUs is 200 MHz FSB the other is 266 MHz. Both are running the
> memory at 133 MHz (the BIOS on the KT7A lets you do this). The system
> speeds are within 1% of each other.
Here it is the SDR memory bandwidth which is the limiting factor. The 1%
improvement probably comes again from synchronous operation.
> Regards
> Brian Beesley
Daran G.
_
Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm
Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
