Re: Chips & Processors & Oscillators and other Go Fast Goodies?

[marvinmiller@hotmail.com (Marvin Miller)]

Hi Wayne;

Just to clarify, the memory speed issue I had read about earlier was
the relationship between the TAG ram speed and the SRAM speed. It
seems that one must be faster than the other.

I'm trying to get a parts order together for this mod and created a
new post on it. Any help you could give would be appreciated!

Best;
Marvin in Sunny Parksville !


On Thu, 09 Nov 2000 17:32:19 -0800, Wayne Stewart
<waynes@intergate.bc.ca> wrote:

>
>
>Marvin Miller wrote:
>
>> Hi Wayne, Greg & Ruby;
>>
>> As greg mentioned, it's a 7MHz/32K ZipGsx 1.02 card.
>>
>> With regards to the speed of the memory chips, my experience has
>> always been that the best way to fly is identical (matched) memory
>> running at the lowest nanosecond rating. Are you saying that there is
>> a limitation elsewhere in the card that causes it to not take
>> advantage of faster memory? As far as cooling goes, I'm not too
>> worried, I have lots of little fans all over the place for my 'Quest
>> for Speed' !
>>
>> The issue about memory speed versus cache speed was brought up because
>> I seem to remember a post about the speeds being important, not the
>> size, betweeen the cache and the main memory.
>
>There's no correlation between cache speed and ram speed.
>Your memory card is accessed at a set speed and once you have fast
>enough RAM anything more is a waste.
>
>> I'd really prefer to dig up some of the wide chips if possible. I
>> don't really want to modify the card in any way other than plug in's
>> if possible. So, I guess the questions come back to;
>
>To go over about 12mhz you'll likely have to modify the card.
>Usually you need to replace the 74F02 with a 74HCT02 to get
>over 12mhz and it's soldered in.
>
>> Does anyone have a new chip for me?
>
>> Is there another limitation on memory speed other than the chip's
>> actual NS rating that would negate the benefits of faster memory?
>
>The card and computer's buss speed place the limit on how fast the
>chips are accessed. As long as the chip can keep up with the card
>and computer anything extra does nothing.
>Not directly applicable but a very good example of slow memory
>cards are any of the regular slot RAMcards such as the RAMfactor.
>I've had anywhere from 250ns to 70ns chips in them and they still
>operat dead slow, in fact I can access my hard drive faster.
>
>> The Oscillator I have is rectangular - so it sounds like our
>> electronics shop should be able to get them. I'll check out the FAQ's
>> that Ruby mentioned and see what comes up from there as well.
>>
>> BTW; With regards to these mods, I just want the fastest & tightest
>> //GS possible. I'd like to see 20Mhz or higher if possible. My
>> thinking was that memory quality & speed would also be a potential
>> issue at higher speeds. To me, it's kind of in keeping with having the
>> fastest machine around, especially including Vancouver ;-))
>
>Unfortunately the card tops out at about 16mhz in the best of cases.
>When upgrading an accellerator a lot depends on that specific card
>and computer. Some top out at 12mhz and some can be made to go
>faster.
>
>    Wayne
>
>
>