Wot, no type-C Durons?

4 replies [Last post]
RichardJ
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Joined: May 7 1999

Where did all the type-C (133/266 FSB) Durons go to?

Having decided to get a KT133A-based MB and put a fast Duron in it (there being little real difference between Durons & Athlons other than favourable price) I find that there appear to be no type-C Duron chips anywhere. The suppliers aren't even listing them.

Only last month all Durons were available in types B & C, and it looked like type-C was going to be the norm. Suddenly, nothing!

Have AMD withdrawn them as a marketing ploy to keep up sales of higher-priced Athlons? Seems to me the most likely explanation - which would be a pain.

Anyone know what's going on - and if there are any suppliers still shipping the type-C variants?

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Richard Jones, http://www.activeservice.co.uk
Home of the new MediaStudio Pro 6 Tutorial

Richard Jones, http://www.activeservice.co.uk
Home of the MediaStudio Pro Tutorial - Edition 3 for MSP 7

PD
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Joined: Aug 6 1999

Hi Richard,

AMD Duron has always featured a high-speed 200MHz front-side bus.

At present only certain variants of AMD Athlon above 1GHz feature the 266MHz FSB you are referring to.

Cheers,

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Paul

Paul Dutton
DVdoctor R&D

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RichardJ
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Joined: May 7 1999

Paul

I'd happily believe that if it wasn't for the fact that only a month or so ago the big suppliers (Dabs etc) were listing Durons in 200 & 266 variants. Now they're not.

Was this an aberration? I'm certain I wasn't dreaming!

Anyway, having had a good read of the stuff on Anandtech I now understand pretty much how the multiplier settings work, so it looks like any Duron is easily tweakable to use a higher-speed FSB and lower multiplier.

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Richard Jones, http://www.activeservice.co.uk
Home of the new MediaStudio Pro 6 Tutorial

[This message has been edited by RichardJ (edited 14 May 2001).]

Richard Jones, http://www.activeservice.co.uk
Home of the MediaStudio Pro Tutorial - Edition 3 for MSP 7

PD
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Joined: Aug 6 1999

Yeah, Richard,

I’ve been caught out by retailers misleading adverts in the past. Obviously I really can’t comment on what “(Dabs etc) were listing”, especially because I didn’t see what you saw; what I can say about Dabs is that we have found them to be a fairly reliable retailer and one that we always check when undertaking price comparisons for review purposes, so I’m surprised if this was the case.

There has been rumour about Intel releasing some sort of ‘cheap’ Pentium III variant that presumably would replace their Celeron range in light of the significant performance delta between that and the AMD Duron (let alone the price differential); strategically for them this would make some sense but I really don’t know if this will be the case.

Regarding Duron’s ability to operate at frequencies higher than marked for sale, one thing to bear in mind is that in practice raising the external frequency of the processor will also raise the frequency of both the AGP bus and the Peripheral Bus Controller, so aside from potential damage to most system components, display corruption and data loss can occur; including those I have just mentioned, I have seen a whole range of anomalies manifest themselves from overclocking systems.

Pinnacle Systems DV500 is sensitive to overclocking the PCI bus and whilst, in respect of a fifty quid processor, one could say that the risk is worth it, risking 500 or so for the sake of saving a little bit extra for the cost of a higher frequency processor in the first place doesn’t make much sense to me…

Personally I don’t overclock systems used for video editing purposes.

Hope this helps.

Cheers,

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Paul

Paul Dutton
DVdoctor R&D

HEXUS.swankyDynamicSignature - Give it a click!

RichardJ
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Joined: May 7 1999

It was definitely Dabs where I saw these apparent type-C Durons listed, and I cross-checked some others (Simply at least I think) who had the same. Maybe AMD put out a wrong or misleading part availability list? I agree that Dabs are usually reliable and accurate though.

On speed, I'm not talking about overclocking here. I'm talking about the KT133A chipset, which runs the FSB (optionally) at 133 MHz, with all other bits at correct speed. A CPU of a given speed (e.g. 800) can run at 100 FSB with a multiplier of 8, or 133 FSB with a multiplier of 6. The core clock speed is the same, so at the higher FSB the heat dissipation is no greater but the overall performance is better because the memory bandwidth is increased.

The only actual difference between type B & C chips is the default multiplier, but because K7 chips define their own default multipliers you can't just change jumpers or BIOS settings to operate at a different FSB (as you can with a K6 for example).

What it appears you can do though is tweak the on-chip jumpers with a pencil or conductive ink. So I'll get a regular Duron (only type available!), and try some subtle mods. After making sure it works in normal mode first of course

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Richard Jones, http://www.activeservice.co.uk
Home of the new MediaStudio Pro 6 Tutorial

Richard Jones, http://www.activeservice.co.uk
Home of the MediaStudio Pro Tutorial - Edition 3 for MSP 7