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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Helgis75 on May 30, 2003, 09:45:15 AM
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Call me crazy, but i have decided to go overclocking my forthcoming A1G3XE from 800Mhz to 1Ghz, and hopefully the 60x bus of the 750FX G3 CPU could also be run at 200Mhz, as stated. But most important, overclocking the main CPU to 1Ghz!!!!
God, i must be crazy, but i really want to! I have ask for help without going by the mailing-list, as they don't really are so kind of breaking the CPU-warranty by overclocking it...I asked Ole-Egil personally :-D ;-) Let se how it will perfom:-)
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Personnaly, I am going to eat a hamburger for lunch ! :-P
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Helgis75 wrote:
Call me crazy, but i have decided to go overclocking my forthcoming A1G3XE from 800Mhz to 1Ghz
Cool! :-)
Don't forget to tell us how it worked!
BTW, haven't you still got your A1?
hopefully the 60x bus of the 750FX G3 CPU could also be run at 200Mhz, as stated.
(That old Offspring hit (http://www.offspringnation.com/audio/americana/pf_56K.mov) popped up in my mind)
The Articia: "Give it to me baby"
Helgis75: "Aha, aha"
:-D
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Helgis75 wrote:
Call me crazy,
CRAZY
:lol:
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With that many exclamation marks in the subject line, I'm sure it's got to work!
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jeehh!!! you got propably 20-26% more speed
is it worth it??? what if you cpu explode!!??
you most be crazy!!!!! :-D
"but meaby i overclock my a1 too "
i have overclocked blizzard 210 to 266.. and little
unstable behavior noticed! 8-)
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@Helgis75
dont forget - the IBM Part (750FX) is rated as having an external interface running at up to 200MHz (ie: extreme limit) but dont forget two other very important parts: the motherboard and the Articia-S.
I believe the Articia is only capable up to 133MHz (possibly 150 but that might be pushing it), so therefore the motherboard wont be going much faster than the chipset.
I feel the fastest FSB is therefore 150 if you are incredibly lucky, and you run it outside in winter with a fan the size of the Cornwall wind farm.
and given the trouble people have been having with Memory at 133 MHz, I'd say 150 might be a step too far.
so: 133 MHz FSB, set multiplier to 7.5 times, put an [color=0033FF]Enormous[/color][/b][/i] fan on the CPU. possibly one on the northbridge too !
other than that, good luck, hope you dont fry your long awaited A1. ;-)
apparently IBM had a bit of trouble getting FX's to run nicely at 1GHz - so they shrunk the die (and a few other tweaks) to get the GX (up to 1.4GHz ?). HyperionMP posted on another list somewhere... Ben - wanna confirm ?! :-) )
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Go for it im thinking of doing it when i get my board. :-)
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Yes, you are crazy. Overclocking is nuts. Why not just break your CPU now and save all those hours of work and uncertainty? :crazy:
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Yes, you are crazy. Overclocking is nuts. Why not just break your CPU now and save all those hours of work and uncertainty?
Ive had an athlon and a celeron overclocked for years with no harm only stupid people who dont know what they are doing burn cpu,s out. :-?
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Ive had an athlon and a celeron overclocked for years with no harm only stupid people who dont know what they are doing burn cpu,s out.
There must be a lot of stupid people around, then. ;-)
But seriously, why risk damaging the PPC, validate your warranty, and give yourself heat and stability problems for a very weak speed boost?
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:crazy: ... ;-)
Seriously, I hope it works out.
Questions for the tekkies out there ...
Wouldn't the rest of the board still be operating at it's normal slower speed?
Wouldn't this require "wait states" (or whatever the modern equivalent term is called) to be added to each access of system memory or AGP slots or PCI slots?
/* IMHO....
I can see overclocking the CPU if the cache memory is large enough to contain the entire program you are running, plus all the data it needs to do the job. If the CPU has to continually access the normal system RAM or disks or PCI slots or AGP slot, then it will be restricted somewhat by the speed of those external interfaces.
(entering dinosaur mode) ....
In the old days we accounted for slower memory or I/O devices by adding "wait-states" to each access of those slower RAM chips or I/O devices. This involved stretching clock pulses or using "wait" signals to tell the CPU to stretch out the access long enough for the slower device to respond.
...*/
---------------------
redfox
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nothing wrong with overclocking, but make sure you do it in small steps"a couple of mhz", then check for any signs of stability problems.. if its ok, up it some more and so on :-)
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KennyR wrote:
Yes, you are crazy. Overclocking is nuts. Why not just break your CPU now and save all those hours of work and uncertainty? :crazy:
You dont break it if you do it with caution... Sure, if you up the fsb/multipelere all the way up at once, then yeah... you can hurt it really bad..
But when you do it in small steps, one mhz at a time...
Actually many processors is actually a higher model just downclocked... For example those AMD xp1700 throughbred cpus, they are actually XP2400+ or higher...
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With that many exclamation marks though, you're bound to overflow the exclamation mark buffer in the G3, especially if it's overclocked.
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Wouldn't the rest of the board still be operating at it's normal slower speed?
That depends on how you decide to overclock, don't it? :-)
Overclocking the FSB is generally more tricky than CPU overclocking (unless you have to do some hardware hacking on the CPU itself, then that's harder :-)), and usually you can't overclock the FSB that much, as you still have to maintain timings with other devices in use, so the benefit generally isn't that great.
I never noticed a difference in my GeForce 2 GTS performance when I had to have the AGP clock to 83MHz instead of 66MHz (due to 133MHz CPU in BX chipset mobo). That's not to say that FSB overclocking is useless, just a real-life example.
What you were saying about programs being stored entirely in the CPU's internal memory cache. Don't count on it. If anyone were thinking that this would be a major factor, run some performance monitoring software specifically for the CPU (I can't find the software I used to use anymore, I'm going to have to email a mate to find out its name and download it again :-)), then run the apps you generally use to see what kind of cache hit successes you get.
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Overclocking the FSB is generally more tricky than CPU overclocking
Not really... thats usually the only way to do it these days, unless you unlock the cpu. Most of todays cpu has sadly locked multipilere, i dunno if the g3 has it though...
FSB overclocking is not affected by this lock.. though you might be a bit limited since you cannot adjust the multipilere.
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Not really... thats usually the only way to do it these days, unless you unlock the cpu. Most of todays cpu has sadly locked multipilere, i dunno if the g3 has it though...#
Some do, some don't. A recent AthlonXP hasn't IIRC.
From what I've seen of FSB overclocking, sometimes you can tweak the FSB without screwing with PCI clock, and most of the time you have to screw with the PCI clock. And then all you need is one fussy card on that bus. Like say an SBLive! :-)
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Good luck with it Helgis. Personally I'm happy enough with mine at 800MHz... what's 200MHz between friends eh? ;-)
Regards,
Ben de Waal
AKA Yttrium Oxide
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This high of an overclock (200 mhz fsb) is impossible since fastest sdram afaik is capable of 166 mhz. itd be possible to push it some more i guess but then you've got all sorts of latency and timing problems, also the agp and pci are locked onto the fsb so at 166mhz fsb you'd need a 5 divider, with fsb 200 you'd need a 6 divider unless you want to overclock agp and pci aswell.
Not that im against overclocking, when it works its great.
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Hmmm..i do know that even that the G3 could be overclocked right up to 1Ghz, it WILL get a bit heater than originally...It seems to me that most people just overclocked the main G3 CPU to 933Mhz, and not more...
Maybe i would consider just run it at 933Mhz instead without having to go for a bigger CPU-cooler than that delivered with the CPU...I have to think about it..:-)
Thanks for any good advices:-)
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Helgis75 wrote:
Maybe i would consider just run it at 933Mhz instead without having to go for a bigger CPU-cooler than that delivered with the CPU...
Have other A1 owners really said that they do that? According to my experiences, cooling is essential in overclocking. I'd recommend you to be safe rather than sorry. :-)
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Helgis 75:
I have ask for help without going by the mailing-list, as they don't really are so kind of breaking the CPU-warranty by overclocking it...I asked Ole-Egil personally
Geez, when I first read that, I thought Ole-Egil was a Norse God you had prayed to for help regarding overclocking your A1!!!! :-o
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Have other A1 owners really said that they do that? According to my experiences, cooling is essential in overclocking. I'd recommend you to be safe rather than sorry.
I've used mine overclocked G3-XE @ 933 Mhz, with the original heatsink, for a long time, without any overheating problems.
Anyway I suggest to be on the safe side and use a bigger / better heatsink.
Ciao
Massimiliano Tretene, S o f t 3 (http://www.soft3.net)
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From Ole-Egils FAQ you can work out how to get 933Mhz
1. FSB at 133Mhz multiplier x 6 (default setting) 800Mhz
2. FSB at 100Mhz multiplier x 8 (cheapo memory) 800Mhz
1 = on 0 = off
For 1. dip switch setting on the G3 module are 1 0 0 1
For 2. dip switch setting on the G3 module are 0 1 1 1
x6 ( 1 0 0 1) = Decimal 9
x8 ( 0 1 1 1) = Decimal 7
x6=9 x8=7 therefore x7=8
x7 multipler in binary 1 0 0 0
933 Mhz ;-) ;-)
Not that you would do this however as it against your warranty