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eMac 800Mhz -> 1.33GHz conversion

Re: 700MHz -> ????

Originally posted by bigbadmac
I'll give it a try if I can get some info on the jumper locations on the MB. Maybe the jumper settings on the 733 are the same? What the heck... my warantee is dead anyway and I've already had to resolder the CRT cable myself...
Click to expand...
i have a different bus 133 so my multiples jumped by 67 mhz different then your bus of 100. i would imagine the same jumpers as the 800 since nothing changed except the chip they inserted. also the 7450 wont be as kind to increasing the speed as ibodnars 7455. i would try to get it to 800 and be happy with that. ibodnar has a nice page at xl8yourmac and the jumpers should be the same. i would talk to him for more info on emac. good luck and dont forget static precautions.
 
I, too, have original 700Mhz eMac that would love to oc. I've already added 120GB 7200RPM 8MB HD and SuperDriver (re-badged Pioneer A05) but have always wanted more VROOM.

Anyone else with experience oc 7450?

Good job OP! You've given me new hope!
 
Re: Re: 700MHz -> ????

Originally posted by lbodnar
way to go, bigbadmac! You can get configuration details from 7455 datasheet. Look for 100MHz bus on page 47. Your options are:
700 ++-++
750 +++-+
800 --+++
850 +--++
etc...
"+" is shorted (0) and "-" is open (1).

Let us know! Can you take a picture of the board to compare with 800MHz eMac?
Click to expand...

[EDIT] D'oh! Spoke too soon. Didnt' see page 37.
I wonder if 7450's limitation is at 800Mhz (8x multiplier). Look at following
7450 datasheet page 36.

Now it would be really cool to oc FSB from 100Mhz -> 133Mhz!
 
amazing!

I installed a Pioneer 105 in my 700MHz eMac (following the wilko site's instructions) and I thought that was a feat. this how-to is incredible.

I could have saved a lot of money over getting a 1.25GHz PM G4 and ADC CRT.

it's great to know I could make a cheap cluster node in the future out of an 800MHz eMac. I'll soon be experimenting with whether Compressor encodes any faster with a Shake Qadministrator- created cluster. Compressor and Shake both use the same Qmaster and Batch Monitor.

if someone else out there could run the experiment that would also be great.

at school we have labs of 733 to 867 dual PM G4s, most with Shake, all with After Effects, and they aren't set up for network rendering. early next semester I'll volunteer to set up a Shake cluster throughout the lab... hopefully 2-pass VBR DVD encoding will really fly... and hopefully they have gigabit switches between all the machines.
 
700MHz -> ????

I'll keep you folks posted on what I get for overclocking this eMac. There are a couple of other basic mods I've done to this machine as well.

Power button is now on front under LED.
Headphone Jack is now on front between left speaker and DVD door.
Installed a Pioneer DVD-RW DVD-R 105.
Installed a 160GB Maxtor HD.

Planning a cold cathode light in the case.
Planning a LED under light to illuminate the keyboard.

I'm also interested in putting the MB in a different case... still need to work on the PS problem and pin-out on the connectors to the MB.

More to come...
 
Re: 700MHz -> ????

Originally posted by bigbadmac
I'll keep you folks posted on what I get for overclocking this eMac...

I'm also interested in putting the MB in a different case... still need to work on the PS problem and pin-out on the connectors to the MB...
Click to expand...

bigbadmac, that was the reason I have ended up with eMac. I was going to throw the CRT away and stick the guts into another box. However it turned out to be such a baby! :) I guess we are on the same wavelength so...

1. What is power supply "problem"?
2. Do you think motherboard CRT connector has actually standard SVGA signals and can run external monitor? I want two 19" TFTs!
3. Airport is supposed to be just a mini-PCI card with altered edge-connector. Any light in this direction?
4. What's that unpopulated connector in the middle of MB?

Enough for now!
 
Re: Re: 700MHz -> ????

Originally posted by lbodnar
bigbadmac, that was the reason I have ended up with eMac. I was going to throw the CRT away and stick the guts into another box. However it turned out to be such a baby! :) I guess we are on the same wavelength so...

1. What is power supply "problem"?
2. Do you think motherboard CRT connector has actually standard SVGA signals and can run external monitor? I want two 19" TFTs!
3. Airport is supposed to be just a mini-PCI card with altered edge-connector. Any light in this direction?
4. What's that unpopulated connector in the middle of MB?

Enough for now!
Click to expand...

1. The PS is integrated for the CRT and MB. Like the iMac, you would need to know the power requirements of the MB and the pin-out on the connectors. Once I figure this out, I can mod a common PS to run the MB. I have limited equipment here so the process is slow with a lot of Trial & Error.
2. I don't see why not.
3. This is something I was interested in some time ago. I have not found any info leading to that point but if it is nothing more than mini-PCI, it could be feasable to mod that as well to use other PCI cards... interesting subject for sure.
4. Beats me... if only I could get my hands on the MB schematic...:cool:
 
If i have a 1 GHz eMac do you think it would still be stable if i over-clocked it to 1.4 GHz
 
Hi guys. I'm a new user. But a long time user of several other mac forums. I saw the article on slashdot, and then found this site. Anyway I have a 700mhz eMac I would love to overclock to 750-800mhz range. Simply to meet the min. requirements for iLife 04. I have already done the Superdrive, RAM, HDD upgrade like so many others, but this would be the icing on the cake. If anyone has any success wiht this please let me know, either post here or email me. Thanks in advance.
 
Eryan, I think chances are 50/50. Quite possibly 800 and 1GHz models use the same processor running at different speeds. If 1GHz uses truly better CPU then the chance is very good! But in the end someone has to try. And again there is nothing certain, it all is a chance...! :)
 
you have become quite popular ibodnar i saw another article about what you did at applexnet Its pretty sad apple plays all these stupid games instead of trying to sell computers. If they were doing a better job at building the best machine with the best hardware they could double their measly marketshare of 3.2%. They should fire some of those bean counters and start hiring people who love macs and want macs to be the best they can be. they could have sold 1.25 emacs 6 months ago and probaly would have sold every unit they could make but instead they play their handicap game. way to go.
 
i'm a little new to soldering, so i was wondering how hard it was/is and the tools required.

can G3s be OC'ed as well?
 
say what you may but they do play the handicap game and end up with 3.2% market. thats the fact. Emac is still the best value and same goes with the G5s.

Anyone reading this article please be aware that most of this should only be attempted if you have electronics knowledge otherwise you could hurt your machine or yourself. should have said that sooner. static damge, electric shock etc. this isnt for the novice.
 
eMac700 -> ???

OK kids, here goes...

I'll be tearing the eMac 700 apart this eveining and installing a jumper switch I can access from the RAM access port. This will enable me to change the jumper settings without having to open the box each time. Also will only have to solder/desolder only once.

Speaking of tools, take "Dont Hurt Me" to heart on the attemp warning. ESD is a major issue with the internal guts of your Mac. I personally recomend a good ESD Mat and ESD safe Soldering Iron. I use an iron I can control the tip temp very accuratly. It pays off when working with SMT components and IC's. The good folks at Shadio Rack...OOPS!... can get you started.

If all goes as planned, I'll set up a website with the details. I will also include the other mods as they are done and other odities I'm currently working on.

Thanks to all on this discussion group for your input... BOMBS AWAY!!!
 
bigbadmac, if you want to have an access without taking it apart every time, dismantle CDROM and leave perforated shield out. Assemble the case as normal and you will have eMac with the full access to guts - all you need is just to turn it over. That's how I did it.

Also, have a look here, it may be usefull (he also has 100MHz bus):
iMac 800MHz

Please hurry up, people are killing me with questions "I-have-700MHz-eMac-can-it-be-done-too?" :D

P.S. I have uploaded more guts' pictures
 
Originally posted by Dont Hurt Me
say what you may but they do play the handicap game and end up with 3.2% market.
Click to expand...

DHM, I agree with you on this point and on a whole bunch of what you've posted in other threads. I only meant to make a joke about the people who disagree with you (the apologists).

another example of the handicap game is FCP 4's G4 only requirement. I got FCP 4 to work on my old G3 iBooks (700 and 900), using a method described by an LAFCPUG member. FCP 4 worked better and faster on my G3s than FCP 3 did. I even updated the program to 4.1.1 (using the same method) through software update. of course I couldn't get Compressor to work on a G3, and I didn't bother with LiveType, Soundtrack or Cinema Tools.

if Apple had been selling 1.25 or 1.33GHz eMacs this whole past year they'd have made a lot more money and invited many more switchers. and that would not have "cannibalized" Power Mac G4 sales. Power Mac G4s are already plenty differentiated by PCI card and HD expandability, double the RAM ceiling, dual optical drive capability and faster system bus. I bought an eMac because I couldn't afford a Power Mac, and I bought a Power Mac as soon as I could afford it because all the Power Mac's advantages.
 
Re: eMac700 -> ???

I'm investigating if it'll be possible to overclock fsb to 133Mhz on 700Mhz eMac. So far I gave gathered info from old PowerMac G4 "Sawtooth" hack which someone has successfully converted 100Mhz fsb to 133Mhz fsb.

Scroll down (4) Bus Clock Configuration

After looking at the current mb, it seems there are 2 possible chips:

[1] Located right of PLL mutiplier
I'm wondering if the registers (R423, R415, R416, R424) is possible bus clock configurarion. If so de-soldering R416 and R424 should convert it to 133Mhz.

[2] Above CPU
This was suggested by Leo as possiblity. I've compared withLeo's picture on his website and on Leo's 133Mhz fsb mb the R303 was closed/jumped. (Could not post multiple images. see below for second image)

Anyone with 133Mhz fsb eMac mb, could you please compare the registers?

Many thanks
 

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don't know how to attach multiple images...

Here is 2 image "Above CPU"
 

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wow, this is getting interesting.

it seems there are a bunch of eMac users out there wanting a little more speed.

i'm surprised there isn't a larger Mac overclocking community.
 
Just poking my head and let you know I'm watching.

I'll be opening my iMac back up to look at the mainboard when my RAM upgrade arrives, or to clock down from 1Ghz due to stability. When I do so, I'll search for possible FSB registers, post pics if I can.

In the meantime, wow I agree, this is getting interesting.
 
100Mhz fsb -> 133Mhz fsb

yet another pic...

This is directly back of 1st pic ("Right of PLL"). The words "UNI_INT_PCICLK" has caught my eye. :confused:
 

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700MHz -> 900MHz SUCCESS!!!

Well kids, it works! I opted to mount a jumper connector salvaged from an old SCSI drive between the DVD IDE cable and DVD power cable. I will include a link to a website for all the details about the mod.

Anyway, this allowed me to quickly and safely change the jumpers without having to solder and desolder those itsy bitsy jumpers. Here's the skinny...

Stable at:
750MHz + + + - +
800MHz - - + + +
850MHz + - - + +
900Mhz + - - - -

The chip is rated for a max of 1GHz. Once I'm satisfied with 900MHz running stable over time, I'll clock it up to 950MHz for a while to see how it does.

More to come...
 
Re: 700MHz -> 900MHz SUCCESS!!!

Awesome job! I like the idea of adding jumpers!

Can't wait to see how you done it. Keep up the good work :D
 
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