[Grrr]

Hmm, a little grim news.. My previously rock solid eMac has frozen a couple of times today. Most likely due to it's recent operation.
It did still pass the extended Apple hardware test though. But still, i'll look at the cooling to see if I can improve it. Failing that, i'll wind it down a bit to 1.2ghz, and see how it gets on.

Not looking forward to taking the damn thing apart yet again though

[caprae]

http://www.lbodnar.dsl.pipex.com/eMac/eMac-upgrade.html

Ibodnar - your page is coming up missing in action. Where is it?

[lbodnar]

Originally posted by caprae:
http://www.lbodnar.dsl.pipex.com/eMac/eMac-upgrade.html

Ibodnar - your page is coming up missing in action. Where is it?

The provider had some problems... Should be back now!

[jaguar28]

[QUOTE]Originally posted by Grrr:
[B]Hmm, a little grim news.. My previously rock solid eMac has frozen a couple of times today. Most likely due to it's recent operation.
It did still pass the extended Apple hardware test though. But still, i'll look at the cooling to see if I can improve it. Failing that, i'll wind it down a bit to 1.2ghz, and see how it gets on.


Grrr,

please let us know if it's stable at 1.2 GHz
cuz I'll rely on that to decide if it's worth trying it on my 1 GHz emac.

Thanks

Jaguar28

[lbodnar]

As a step towards eServe I have managed to measure voltages on eMac motherboard PSU connector shown here.
Pinout considered to be:
08 07 06 05 04 03 02 01
16 15 14 13 12 11 10 09

Voltages: (eMac on/off):
01, 02 +20V/+12V
03, 04 +12V/+12V
07 +19V/+11.5V
13 +0.3V/+8V
14 +0.3V/+0.3V
15 +5V/+5V
05, 06, 08..12, 16 GND

1,2 and 3,4 looks like high current main power
7 ???
13, 14 - control signals
15 +5V TTL logic power

Anybody willing to discuss that here or in e-mail?

[Grrr]

Originally posted by jaguar28:
Grrr,

please let us know if it's stable at 1.2 GHz
cuz I'll rely on that to decide if it's worth trying it on my 1 GHz emac.

Thanks

Jaguar28

Greetings I've still not re-operated on my eMac yet. But if the room is cooler, the eMac has been perfectly stable. So I feel my particular eMac is really teetering on the edge of it's limits at 1.33ghz. I suspect ibodnar has been especially lucky with the speeds achieved from a lowlier 800mhz eMac, or lives in a particularly cold house
So.. I plan to re-apply the heat sink using a better heat transfer compound than Apple uses, and also still down clock it a little to 1.2ghz. I am pretty confident this should work nicely. I'll be back with an update when I have done it.

While I am here.. I have done a benchmark test on my tweaked eMac, using the basic Haxial benchmark app. Also, the 1st 2 tests were with the eMac running 10.2.6, the last test is running 10.3.2 But still, the gains are clearly visible. and you definitely notice this when using meaty apps.

1ghz eMac with 128mb

Benchmark: CPU & RAM
Version: 1.000
Date/Time: 1 September 2003, 10:41:35 AM
Operating System: MacOS 10.26

Total Time: 55,152 millisecs (0:55)
Average Speed: 228.5M bytes/second

Time Speed
Memory Copy: 9,034 123.9M/sec
Memory Fill: 8,664 554.0M/sec
Memory Clear: 8,279 579.7M/sec
Memory Equal: 5,832 192.0M/sec
CRC: 5,995 106.7M/sec
Quick Hash: 3,840 166.6M/sec
Secure Hash: 3,598 88.9M/sec
Encryption: 9,910 16.1M/sec

_________________________________________________
1ghz eMac with 1024mb

Benchmark: CPU & RAM
Version: 1.000
Date/Time: 1 September 2003, 11:02:28 AM
Operating System: MacOS 10.26

Total Time: 50,694 millisecs (0:50)
Average Speed: 246.9M bytes/second

Time Speed
Memory Copy: 5,305 211.1M/sec
Memory Fill: 8,364 573.8M/sec
Memory Clear: 7,874 609.6M/sec
Memory Equal: 5,477 204.4M/sec
CRC: 6,041 105.9M/sec
Quick Hash: 3,825 167.3M/sec
Secure Hash: 3,652 87.6M/sec
Encryption: 10,156 15.7M/sec

_________________________________________________
1.33ghz eMac with 1024mb

Benchmark: CPU & RAM
Version: 1.000
Date/Time: 20 January 2004, 05:42:58 PM
Operating System: MacOS 10.32

Total Time: 43,849 millisecs (0:43)
Average Speed: 273.8M bytes/second

Time Speed
Memory Copy: 5,261 212.8M/sec
Memory Fill: 7,654 627.1M/sec
Memory Clear: 7,352 652.8M/sec
Memory Equal: 4,823 232.2M/sec
CRC: 4,760 134.4M/sec
Quick Hash: 3,167 202.0M/sec
Secure Hash: 2,928 109.2M/sec
Encryption: 7,904 20.2M/sec

[CobaltGT]

I intend to re-operate on my eMac after I move into my new house. Anyone want to donate a trace pen? :-)

Will try 1.533 ghz...

[CobaltGT]

never mind that. apparently the eMac is less happy upside down with his shell off. Seems to be stable at 1.46 now... sigh, maybe i should try 1.53 again

[CobaltGT]

see above

[Stymie]

I wanted to report that my eMac is now running at 1.466 ghz. I ran XBench when I first bought the eMac with OS 10.2.6 so I do have something for comparison. The machine now has 10.3.2 installed. The results are as follows:

1 ghz with OS 10.2.6 - 89.25
1.466 ghz with OS 10.3.2 - 125

I will post if there are any changes.

[Anand]

I find this amazing. If these chips can run 40% faster than they are clocked - why does apple sell them at the slower speed? Why is the iMac not a 1.5 ghz machine?

[lbodnar]

Originally posted by Anand:
I find this amazing. If these chips can run 40% faster than they are clocked - why does apple sell them at the slower speed? Why is the iMac not a 1.5 ghz machine?

Motorola is quilty in marking the CPUs with much lower speed than the one they can run on. Because Apple wants slow yesterday's chips. Try to ask Ford to produce huge batch of 5 years old model. They will most probably offer you the current one under the name of an old one at a reduced price. Because it is cheaper to make.

Apple continues to supply slow entry models at "affordable" price even though they can sell 50% faster computers at almost no extra cost. But they have been historically charging users so much more for just a little bit extra GHz that it would be embarassment for them to accept the fact that those times are over.

Also many features in components often thrown in just for free. So we have Apple disabling them for marketing purposes like extended desktop on e/iMacs and iBooks.

Technological era is over. Enter Marketing. I don't know where all this is going but Apple is not the worst. They are probably the best.

[Dr Reducto]

Originally posted by Anand:
I find this amazing. If these chips can run 40% faster than they are clocked - why does apple sell them at the slower speed? Why is the iMac not a 1.5 ghz machine?

Apple would want virtually all of the chips to be able to take the clock, but not all of them do. They sell them where they "work". That's the thing about overclocking, not everyone gets the same results. A lot of it is luck.

[Grrr]

Originally posted by Stymie:
I wanted to report that my eMac is now running at 1.466 ghz. I ran XBench when I first bought the eMac with OS 10.2.6 so I do have something for comparison. The machine now has 10.3.2 installed. The results are as follows:

1 ghz with OS 10.2.6 - 89.25
1.466 ghz with OS 10.3.2 - 125

I will post if there are any changes.

Have you run a CPU intensive game yet? Or even the iTunes graphics at full screen. That will crash my 1.33Ghz eMac pretty quickly.. With minimal loading, It's rock solid. But then that defeats the object of clocking it.. So I still plan on taking it down to 1.2ghz.. Still didnt get around to it yet.

I think it's luck of the draw with this overclocking deal.. Some can take it, some cant.. Be warned folks. Having said that. If you know what you are doing, then you cant do any real damage. Just end up having to take the time to do it all over again to fix it later.

[tobyg]

I just updated mine to 1.33ghz last night. I've been, for the last couple of hours, running dnet, ripping dvd's, running garageband, running itunes with the visualizer on (all at the same time) without any problem. the air blowing from the fan in back is 'warm'. the system is relatively responsive... albeit a bit sluggish (duh). Oh and the background is rotating every 5 seconds...

i'm going to let it run this way overnight. if it continues, i'm going to claim this one successful (and perhaps try higher!)

it's been running like this for a couple of hours so far. and if its not successful, i'll back it down to 1.2 or whatever the others here have tried.

[Grrr]

Hello folks.. Thought it was worth bumping this up again with a news update..
I still find it amazing that people are now running 1.46ghz eMacs reliably. I just wish mine would work at 1.46ghz too :/ It was not quite happy at 1.33ghz, so I downclocked mine to 1.2ghz tonight, and so far, it's been 100% good. So still a 20% increase for a couple of hours work. Cant grumble really

Ibodnar, if you still happen to be around reading this.. I notice on your site that you said you were pretty sure your eMac had an underclocked cpu. Yet it is stamped 'RX800RF' (As seen here http://www.lbodnar.dsl.pipex.com/eMa...eMac-CPU-3.jpg ) Mine was stamped 'RX1000RF' which would suggest yours actually was an 800mhz cpu, and mine was a 1ghz cpu, as it should have been. So perhaps there are differences after all?
Although this doesnt explain how you manage to run an 800mhz cpu at 1.46ghz, yet I cant run a 1ghz cpu at 1.33ghz.

While it was apart, I used some top quality silver based conductive thermal transfer compound on the CPU-heatsink. Not sure how much this helped, but now of course I am wondering if with this little mod, it might have run ok again at 1.33ghz or more after all?? Hmm..

So, who's got the fastest eMac now huh?? I'm curious..

[tobyg]

Mine ended up being slightly unstable at 1.33, and I had to back it down to 1.2ghz. Still, I'm quite happy with the 800->1.2ghz upgrade.

As far as being underclocked... I think what he means is no matter what is stamped on top, the processor may actually be originally spec'ed to go faster. They may have had a need for 800mhz processors and everything was being made at 1ghz... so they just took some of those and stamped them at 800mhz.

[runningduck]

For those of us with 700 eMac.... What do you guys think of this? A 700 eMac to a 900eMac (stable) http://www.studio-northwest.com/Hakz/index.html I really don't have any sodering experience but if it is just a matter of removing a couple jumpers that seems simple enough.

[george68]

Reminds me of my old imac.

- Rob

[Chinasaur]

For all of you that did this... whaddya think now?

1. Stable?
2. Running cool/cool enough?

Inquiring minds need updates

[Grrr]

Originally posted by Chinasaur:
For all of you that did this... whaddya think now?

1. Stable?
2. Running cool/cool enough?

Inquiring minds need updates

Mines been 100% stable at 1.2ghz. As for temp, no idea? Seems the same as far as I can tell. CPU temp apps dont work on my eMac so its really hard to say whats really going on in there. I'm guessing the CPU itself is not one of the models with the built in temp sensor.
Either way, it all works very nicely now

[the_glassman]

Anyone do a 1.25 GHz eMac yet? Is it possible to get 1.6 or 1.7 GHz out of them?

[Lateralus]

The 7447 G4 in the eMac has a ceiling of about 1.5GHz. So thats about the biggest OC you could expect.

[Lancer409]

Originally posted by PowerMacMan:
This is truly amazing, especially for those of you who paid $5xx for an eMac refurb. I mean... 1.33GHz+ of G4 power for less than $600!

Whats amazing is that a 1.467GHz processor upgrade for the Power Macs costs that much. Hell, even a good 1.25 upgrade costs a little over $400.

Incredible.

Bastards. Making me want to sell my Power Mac and buy an eMac...

...

i can see it now... eMacMan!