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  ECS i845 board review questions... 
 Date Written 
Robert Kropiewnicki Nov 01, 2001, 11:10am EST Report Abuse

I have a couple of questions for you regarding this board.

1. Will it support Northwood P4's when they come out? If so, are they Northwood ready now or will they require a BIOS revision?

2. Is there a performance penalty for running the memory asynch to the FSB (100 MHz QDR to 133 MHz)?

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Dan Mepham Nov 01, 2001, 11:34am EST Report Abuse
>> Re: ECS i845 board review questions...
Hey Robert,

All S478 boards will support Northwood, as far as I know. (although something could always change, but I very highly doubt it. two platform changes in a few months would not be a smart move on Intel's part).

There's always a penalty for asynchronous memory, but PC133 is still the best option. In other words, yes, it would be faster if the P4's bus was a triple-pumped 133MHz instead of quad-pumped 100MHz (reduced latency, as it would be synchronous with 133MHz memory). But the added bandwidth more than offsets any latency penalty, so PC133 is still the best option. And since it's even cheaper than PC100 in a lot of cases, there's no reason to be going for PC100 at all. Unless maybe you had some in an older system or something.

Take care

Dan Mepham
Dan Mepham Nov 01, 2001, 11:43am EST Report Abuse
>> Re: ECS i845 board review questions...
I should rephrase that. Using asynchronous PC133 is 'less than optimal' use of PC133, you're right. Like I said, a 133 x 3 bus would be ideal. However, even less than ideal use of PC133 is still better than ideal use of PC100. Think about other chipsets like the KT133A. Was the KT133A EVER faster with PC100 than with PC133? Definitely not. Sometimes the difference was smaller than others, but PC133 is virtually never going to be SLOWER.

Hope that clears it up a bit. :-)

Dan Mepham
Robert Kropiewnicki Nov 01, 2001, 12:27pm EST Report Abuse
>> Re: ECS i845 board review questions...

Regarding your previous post, I'm guessing you meant KT133 with PC100 vs. PC133. KT133A has a 133MHz DDR FSB so it's synchronous with PC133 RAM. No reason you would put PC100 in a KT133A to start with unless it was all you had.....or you had a Duron and were going to underclock the FSB.

Dan Mepham Nov 01, 2001, 01:00pm EST Report Abuse
>> Re: ECS i845 board review questions...
Sorry, by bad, I should clarify that. Actually what I meant was a KT133A with a 200MHz FSB, and PC100 vs. PC133 (200/100 or 200/133). That's basically the same situation as the i845, 400/133 vs. 400/100. But yeah, KT133 would maybe have been a better example. Either way, you get the gist of what I'm saying, I'm sure. :-)

Dan Mepham



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