Actually eMac has a space for installing some sort of connector or jumpers block. Look below. Area 1 controls CPU clock. Area 2 controls something else. What? The full picture is here.
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eMac 800Mhz -> 1.33GHz conversion
- Thread starter lbodnar
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my emac
well I have an 800MHz emac based on the 7450 cpu. I bought it about 1 month before the new models that are currently available came out. I did the jumper mod, and since this emac has a 100MHz bus, things were a bit different (just math wise). The highest speed jumpering offered no video and no startup sound on power on. The next slower setting had no video, but the startup sound, but still nothing else. So this time I went with the 9x multiplier (the 1.2GHz one). We got boot! 900MHz... however it is unstable. It does boot fine if it has been off for a bit. All benchmarks and hardware tests cause it to lockup/crash. OSX runs just fine and so do any programs. Its running right now. I guess it is just too hot, or that the cpu just cant handle much above 800MHz, since that was the fastest eMac at the time. But Im thinking heat, because Im pretty sure that 7450 cpu is rated higher than 800MHz, right?. Anyways I am going to drop the speed again (think it will be 850MHz then)... its not really worth the mod. I added some thermal compound (arctic silver 5) to the heat sink/core hoping that if it was heat, maybe this would help. The heat plate is different from the one on the update page, it is pretty much totally attached to the hdd case with soldered heatpipes going from the heatsink to the hdd cage passing over two other chips (not touching them however).
It would be nice to see how you got the switch on there so I don't have to move the computer and/or take off the case everytime I need to solder/desolder.
Anyways, That was my experience... it works, but I just don't think the CPU can handle much higher than 800MHz, that or there is a heat problem.
well I have an 800MHz emac based on the 7450 cpu. I bought it about 1 month before the new models that are currently available came out. I did the jumper mod, and since this emac has a 100MHz bus, things were a bit different (just math wise). The highest speed jumpering offered no video and no startup sound on power on. The next slower setting had no video, but the startup sound, but still nothing else. So this time I went with the 9x multiplier (the 1.2GHz one). We got boot! 900MHz... however it is unstable. It does boot fine if it has been off for a bit. All benchmarks and hardware tests cause it to lockup/crash. OSX runs just fine and so do any programs. Its running right now. I guess it is just too hot, or that the cpu just cant handle much above 800MHz, since that was the fastest eMac at the time. But Im thinking heat, because Im pretty sure that 7450 cpu is rated higher than 800MHz, right?. Anyways I am going to drop the speed again (think it will be 850MHz then)... its not really worth the mod. I added some thermal compound (arctic silver 5) to the heat sink/core hoping that if it was heat, maybe this would help. The heat plate is different from the one on the update page, it is pretty much totally attached to the hdd case with soldered heatpipes going from the heatsink to the hdd cage passing over two other chips (not touching them however).
It would be nice to see how you got the switch on there so I don't have to move the computer and/or take off the case everytime I need to solder/desolder.
Anyways, That was my experience... it works, but I just don't think the CPU can handle much higher than 800MHz, that or there is a heat problem.
eMacX, my conclusion is that eMac 100MHz and eMac 133MHz use very different models of CPU. The former seems to be "the fastest of the old" and the latter - "the slowest of the new". Just comparing the heatsink sizes tells it all it looks like heat is not a factor at all with 800MHz@133Mhz bus CPUs. We have to devise a reliable way to tell CPUs apart. Mine reports 7455 in XBench but in fact says 7445 on its surface and in terminal
Does anybody know the best software to find out all the chip details (stepping, etc)?
Code:
LBodnar:~ lbodnar$ machine
ppc7450Does anybody know the best software to find out all the chip details (stepping, etc)?
i got ppc7450 here, and it says in big letters on the cpu, 7450. hehe
I'd be interested in a FSB mod.. but then again maybe.. if the cpu couldn't handle the new speed. Oh well... if even 850MHz doesnt work when i try later, I will go back to 800MHz.. it was fun and a learning experience.
The mac has been up for a bit now at 900MHz just kinda idle, with some apps loaded in ram. I can run xbench sometimes, others it crashes. Go Figure.
eMacX
I'd be interested in a FSB mod.. but then again maybe.. if the cpu couldn't handle the new speed. Oh well... if even 850MHz doesnt work when i try later, I will go back to 800MHz.. it was fun and a learning experience.
The mac has been up for a bit now at 900MHz just kinda idle, with some apps loaded in ram. I can run xbench sometimes, others it crashes. Go Figure.
eMacX
I've posted more interesting info in my blog, and I've perhaps found some help for finding the information we need to adjust the FSB, and possbily even the vcore.
Take a looksie. The guy's name is 'Tycho', and he's posted a lot at xlr8yourmac. I've posted links into the corresponding threads. I've e-mailed him and I'm awaiting a reply. Interesting reads though.
Take a looksie. The guy's name is 'Tycho', and he's posted a lot at xlr8yourmac. I've posted links into the corresponding threads. I've e-mailed him and I'm awaiting a reply. Interesting reads though.
Hey! I got a response from Tycho.
This could be the week my iMac gets up to 133mHz FSB. I had someone asking me about 167 on the iMac. As much as that would rock, I just don't see if happening. Even if we could, the lowest PLL Multiplier we could get is a 7.
7x167mHz = 1.17Ghz
I can't get stable at a simple 1Ghz as it is, and I've got people aspiring far beyond that already.
Now if a lower PLL Multiplier value were available...maybe. Then again, I still don't know if my issues are thermal or not.
This could be the week my iMac gets up to 133mHz FSB. I had someone asking me about 167 on the iMac. As much as that would rock, I just don't see if happening. Even if we could, the lowest PLL Multiplier we could get is a 7.
7x167mHz = 1.17Ghz
I can't get stable at a simple 1Ghz as it is, and I've got people aspiring far beyond that already.
Now if a lower PLL Multiplier value were available...maybe. Then again, I still don't know if my issues are thermal or not.
Re: 700MHz -> 900MHz SUCCESS!!!
What have your stability tests shown so far? Does the CPU seem to generate excess heat @900mhz? I'm planning on cracking mine open this weekend, but I'm not sure how far to overclock.
What have your stability tests shown so far? Does the CPU seem to generate excess heat @900mhz? I'm planning on cracking mine open this weekend, but I'm not sure how far to overclock.
Yes I'm an ignorant one, but where's the PLL multiplier on the 100bus MB? I don't know what exactly to look for, and I don't see what I am looking for (++-++) anywhere. Is it hidden by the heatsink or something?
Oh wait, I guess it's probably on the back of the logic board...I'm somewhat reluctant to take off the heatsink (as the disassembly manuel suggests) to get to the back of the board (because I don't have any thermal grease lying around).
Is it necessary to take the heatsink off to get the logic board off? Is the PLL multiplier back there, even?
Is it necessary to take the heatsink off to get the logic board off? Is the PLL multiplier back there, even?
I took the logic board off without removing the heatsink, seems ok.
Found the PLL multiplier too, it's fairly obvious once you look on the back of the board
Found the PLL multiplier too, it's fairly obvious once you look on the back of the board
700MHz -> 900MHz SUCCESS!!!
The site is nearly done loading. It will take some time to upload the PDF so be patient... I'm also working on a PDF version of my manual.
I'll check back here for feedback.
Overclock your 700MHz eMac to 900MHz!
BigBadMac Hakz
The site is nearly done loading. It will take some time to upload the PDF so be patient... I'm also working on a PDF version of my manual.
I'll check back here for feedback.
Overclock your 700MHz eMac to 900MHz!
BigBadMac Hakz
Awesome!!!
Very cool, thanks bigbadmac. If I read your info correctly, removing the 2nd (R1509) jumper would result in 850mhz. Removing the 2nd, 4th (R1512), and 5th (R1515) jumpers would result in 900mhz. Am I correct or upside down?
Very cool, thanks bigbadmac. If I read your info correctly, removing the 2nd (R1509) jumper would result in 850mhz. Removing the 2nd, 4th (R1512), and 5th (R1515) jumpers would result in 900mhz. Am I correct or upside down?
Tomahawk is an awesome plane, I just got my license in a Warrior/Archer. I also have a 800mhz ATI emac just got it from Apple Refurb. I'm looking to do some upgrades to it later on
Re: Awesome!!!
You would be correct! Like I said, the real reason I installed the jumper connector was to test out the various configurations.
You would be correct! Like I said, the real reason I installed the jumper connector was to test out the various configurations.
I would love to find a slim form factor dip switch bank I could solder into my iMac so I can do a quick shutdown, flip some switches, come back up.
I don't have one handy, otherwise I'd have done it already.
Also, I haven't given up on installing that Tennmax fan on my heatpipe. I think I can do it. That extra cooling might just be enough.
I don't have one handy, otherwise I'd have done it already.
Also, I haven't given up on installing that Tennmax fan on my heatpipe. I think I can do it.
That extra cooling might just be enough.
Re: Re: 700MHz -> 900MHz SUCCESS!!!
Navion L17 and D, C150, CozyMkIV in the works...
Originally posted by lbodnar
Are you a pilot? Tomahawk and C152 here
Navion L17 and D, C150, CozyMkIV in the works...
BAH! Soldered it up for 850Mhz...and...
Startup sound but no picture...the air coming out the back isn't hot.
I might have fried something, although I sure hope not.
Startup sound but no picture...the air coming out the back isn't hot.
I might have fried something, although I sure hope not.
Blind Mate Connector
Hi, I'm really interested in putting an ATI eMac in an ATX Case. The 133MHz basically seems to be an underclocked PowerMac G4 without FW800 and so I reckon (as the latest has a 7457) It could do 1.33 GHz easily (a la Powerbook 17").
But my question is, what does the blind mate connector between the digital and analog assembly do? (See the manual on L Bodnar's site: pages 34, 99 and 123) I know pins 7 & 8 supply 12Vdc, but what are the others. I don't think its video, as there is a seperate Internal video connector next to the External Video on the I/O board. I would obviously mod the eMac to an ATX supply if possible. Is all of the voltage conversion for the logic board and optical drives done from that 12V connector on the logic board by the down convertor?
I cannot find this info anywhere, but an eMac in a Lian-Li PC-50 with a SuperDrive AND a Fast Combo would be so sweet and very cheap!
Thanks for your help, and those great tutorials!
Michael
Hi, I'm really interested in putting an ATI eMac in an ATX Case. The 133MHz basically seems to be an underclocked PowerMac G4 without FW800 and so I reckon (as the latest has a 7457) It could do 1.33 GHz easily (a la Powerbook 17").
But my question is, what does the blind mate connector between the digital and analog assembly do? (See the manual on L Bodnar's site: pages 34, 99 and 123) I know pins 7 & 8 supply 12Vdc, but what are the others. I don't think its video, as there is a seperate Internal video connector next to the External Video on the I/O board. I would obviously mod the eMac to an ATX supply if possible. Is all of the voltage conversion for the logic board and optical drives done from that 12V connector on the logic board by the down convertor?
I cannot find this info anywhere, but an eMac in a Lian-Li PC-50 with a SuperDrive AND a Fast Combo would be so sweet and very cheap!
Thanks for your help, and those great tutorials!
Michael
introducing the eServe!
or find a way to put everything in a 1-rack-unit case, paint the front a glossy white, and call it an eServe G4.
or find a way to put everything in a 1-rack-unit case, paint the front a glossy white, and call it an eServe G4.
Re: Blind Mate Connector
Make that two of us... I've been looking at a few case mods out there for the old iMac thinking that this could be done. Any input by anyone on this would be great! I think this could be a seperate discussion though... maybe "eMac Case Mod" what do you guys think?
Make that two of us... I've been looking at a few case mods out there for the old iMac thinking that this could be done. Any input by anyone on this would be great! I think this could be a seperate discussion though... maybe "eMac Case Mod" what do you guys think?
Re: Re: Awesome!!!
Which was a very smart idea. I just don't want to do that much work, so I was looking for the easiest way to get above 733. Thanks for all your input. I'll let you know how it goes.
Which was a very smart idea. I just don't want to do that much work, so I was looking for the easiest way to get above 733. Thanks for all your input. I'll let you know how it goes.