Overclockability of the new Athlon "C" Chips

Grizely1

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I am thinking... would the fact that the "C" chips are already at a 133MHz FSB mean that they are less overclockable because you can't have as much of a FSB/Multiplier OC mixture? I don't know....

Any input?

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Tempus

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I have a C with an A7V133 and have succesfully OC to 150MHz FSB. I backed it down to 148MHz to be safe though. Hope that helps.

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Bombastik

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Hum i don't know... are talking about underclocking the FSB to 100 so you can fine tune the processor speed?

Well thats a very good question, i'm was thinking about buying a B-type 1Ghz TB but in the light of the new prices i think i'll go for C-type 1.1Ghz or 1.2Ghz... the trouble is i don't expect these processors to be very overclockable since they are pretyy maxxed out and the only "OC" i can immediatly forsee is 150Mhz FSB @ a lower multiplier, or an "UC" (thats underclock) is 100Mhz FSB @ a higher multiplier... the trouble is, i really don't know if it goes for 100Mhz FSBs...:)

So my question is (and partialy your)... can a C-type TB run @ 100Mhz FSB?
 

JOJO

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I don't think you'd ever want to lower the fsb. Specially on a chip that can do 133, although even the b's can do 133

you get better performance gains out of raising the fsb.

10x100 isn't as good as 7.5x133.

if you have a kt133a chipset , try some benchmarks.


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That's one nice OC! Compare what Tom got with the Vapochill.
 
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just curious, Do you think one fsb/mult would run warmer than the other?

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Bombastik

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Look i know 133Mhz FSB is better than the same processor clockship@100Mhz FSB... when i buy my C-type 1.1Ghz i'm gonna try 7.5x150Mhz instead of 8x133Mhz...

What i was trying to say is that @133Mhz or 150Mhz the increments you get on the processor speed are bigger than @100Mhz... say for instance you have a processor that can't do 8.5x133Mhz(1130.5Mhz) nor 7.5x150Mhz(1125Mhz) but it can do 11x100Mhz (1100Mhz) and 8x133Mhz(1064Mhz) and 7x150Mhz(1050Mhz) ...

As you can see 11x100Mhz gets you a better CPU speed, but as you can agree with me gets you lower overall system speed than 7x150Mhz..
 
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Bombastic is all over this- listen to him.
Don't UC the FSB. The C is EXTREMEMLY OCable. Like I have posted previously on other threads-
From what I can tell AMD has not changed anything to make a 1Ghs "C" T-bird different from a 1.33 "C" T-bird except the multiplier. Meaning- go get a 1, connects the F***ing L1's and you have your self a 1.5 air cooled athlon b/c all new C 1gh athlons are UC and can easily run at 1.5+. Is a 500mhz OC not enough for you? Fasted chip on the market isn't enough? Believe me, its the easiest damn OC ever- amazing, but no fun.
 

peteb

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Griz,

I have a 'C' 1.33 Athlon. The nice people at AMD shipped it (AXIA) unlocked.

This baby runs aircooled (45-47 degrees) @ 1.85V to produce a whopping 142FSBx11Mult. If you cannot get to a calculator right now that's 1562Mhz!!!!

I think that is a pretty reasonable overclock, and boy is it quick. I just got a Swiftech 462, and I want to see if I can get it running at 10.5x150...

Pete.

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peteb-

The point of my post was for all you to realize that the 1 ghz is essentially the same as the 1.33, all of which are made to go 1.5 stable and cool, as many people have made note of recently all over the net. L1s are easy to unlock- silver conductor pen cost 5 bucks and takes 2 seconds to apply. This man was asking for a large worth while oc, 1ghz to 1.5+ is more then 1.33 to 1.55ghz. Worth more. I must say that your Voltage is higher then mine required, i kept it at 1.75(default) and pumped the bus to 148*9.5 to 1400mhz stable and cool. I posted stable at 1522, 145*10.5 but it ran too hot for my hs/fan to cool it well enough for me, 125*f. With proper cooling(nice heatsink fan) a 1ghz can run at 145*11=1595 at 1.75. I had heat problems, thats all... it was stable but too hot for MY liking.

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peteb

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Hi,

Wasn't trying to contradict you, just adding wieght that the Higer C chips are very ocable. I have no experience of the 1G tbirds as I went straight to 1.33G.

I can tell you that at the speed I ran, my 1.33 would not post and run stable at 1.75V

Also, my system would not run stable over 142FSB. I have PC133CL2 memory. I also tried proven RAM from a system that runs 148FSB CL2 day in and out. Still the same.

Either I got a specific AXIA that wasn't happy at high FSB, or the mobo (Asus A7V133) wasn't happy over 142.

It would run 24x7 at 1562Mhz.

I wasn't aware that the 1Gs would ALL be = to a 1.33 - my understanding was that the manuf process would rate a chip to is maximum bin (tests to 1.33 -> 1.33 bin). If there is a surplus of 1.33G to 1G AMD then know they can take the i.33G and etch it as a 1G. Therefore you'd get some 1G tbirds that would only make 1.1G or 1.2G etc.

I can tell you that over all - m 1.33 will not run in my system stably at 1595, whether I get there by multiplier or FSB. Going over 1.6G - even at lower FSB guarenteed BSOD in boot on the ntos kernel. This seemes a hard stop for my cpu right now as I cannot get it past 1562 stably. It will run 11x143 for 24hrs, and then lock up for no reason (well, for a reason of course), but at 142*11 it will run for a week.

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funkdog

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My ghz 'C' will do 155x9.5 stable, but as peteb said my heatsink doesn't cool it enough for my taste. I am currentyl doing 150x9 at 28C idle and 38C under load. Goes up to about 48-50 at 155x9.5, keep in mind that my voltage is at 1.75. Havn't tried to up it at all. My AXIA is week 9 2001.