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#1 2015-04-27 21:23:57

max1zzz
Member
Registered: 2014-05-18
Posts: 207
Website

PPC7410 as a replacement for the 7400?

It's a bit of a odd question, but does anyone know if the 7410 is a drop in replacement for the 7400?

After reading that the G3 CPU on the original iMac's CPU card can be swapped with a G4 i have become a little obsessed with the idea...

A quick google shows that the 7400 is pin compatible with the PPC750 but the 7400 is next to impossible to find
I know i could just pinch one off a dead machine (i'm looking at you, TiBook with a dead GPU) but i see 3 problems here:
1) It seems no one makes 0.89mm solderballs or stencils
2) No one makes a 25x25mm 360 pin stencil in the next nearest size solder ball (0.76mm)
3) I suck at reballing chips.... (soldering BGA chips is fine, but reballing them.... those solder balls are so damn small....)

In theory i could use the next nearest size stencil (30x30mm) with 0.76mm solder balls (since the pitch is measured from the center of the pads this should work) but it would be a bit of a bodge job (and could screw up the spacing between the CPU and heatsink)

The 7410 however is still relativity easy to get at a sort of sensible price (£20 a chip, or just under £10 each if i where to buy 5, not that i need 5...)

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#2 2015-04-27 21:30:01

TheWhiteFalcon
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Registered: 2015-04-27
Posts: 504

Re: PPC7410 as a replacement for the 7400?

Isn't the 7410 just a lower power version of the 7400? I didn't think there were any real changes.

Last edited by TheWhiteFalcon (2015-04-27 21:30:21)

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#3 2015-04-27 21:37:17

max1zzz
Member
Registered: 2014-05-18
Posts: 207
Website

Re: PPC7410 as a replacement for the 7400?

Seems that it is, so i guess it should work smile

Just need to check i can get the CPU off the card before I spend £20 on the replacement chip...

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#4 2015-04-27 21:41:06

TheWhiteFalcon
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Registered: 2015-04-27
Posts: 504

Re: PPC7410 as a replacement for the 7400?

Later Cubes and the 400/500MHz TiBooks had 7410's for sure.

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#5 2015-04-27 21:51:41

max1zzz
Member
Registered: 2014-05-18
Posts: 207
Website

Re: PPC7410 as a replacement for the 7400?

I might just try the bodge job reball first actually, as it's both cheaper and means i have the stuff to stick the G3 chip back on if things go wrong

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#6 2015-04-27 23:49:05

ClassicHasClass
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From: Electron Alley
Registered: 2014-05-26
Posts: 1,118
Website

Re: PPC7410 as a replacement for the 7400?

The ZIF 7410 was pin-compatible with the 7400 and the G3. I don't know about the BGA ones.


Machine room (updated for 2019!): http://www.floodgap.com/etc/machines.html

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#7 2015-04-29 21:48:29

max1zzz
Member
Registered: 2014-05-18
Posts: 207
Website

Re: PPC7410 as a replacement for the 7400?

From my quick skim over the datasheets of the 7410, 7400 and 750 all 3 BGA chips are pin compatible, so we should be good to go

Next step is to pull the chip off the old CPU card at the weekend (just to check i can do it without damaging the card....)

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#8 2015-04-29 22:06:44

max1zzz
Member
Registered: 2014-05-18
Posts: 207
Website

Re: PPC7410 as a replacement for the 7400?

Bingo! found a PPC7410 new for a decent price: http://www.aliexpress.com/item/MPC7410R … 19531.html

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#9 2015-04-29 22:58:57

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
Website

Re: PPC7410 as a replacement for the 7400?

Did you find a solder stencil for it?


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#10 2015-04-29 23:06:14

max1zzz
Member
Registered: 2014-05-18
Posts: 207
Website

Re: PPC7410 as a replacement for the 7400?

No need, the new chips should come with solder balls already attached. So it's just a matter of lifting the old chip, cleaning the pads on the board and soldering the new one on

I have found stencils that 'should' work, but they are the incorrect size and are a smaller size of solder ball, but it should work in a pinch. But since I have found now chips at a affordable price there is no need for them now wink

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#11 2015-04-30 06:06:05

mcdermd
Member
From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,022
Website

Re: PPC7410 as a replacement for the 7400?

Nice! I didn't realize the processors were pre-balled (that sounds a bit dirty, doesn't it?)


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#12 2015-04-30 15:39:24

ClassicHasClass
Member
From: Electron Alley
Registered: 2014-05-26
Posts: 1,118
Website

Re: PPC7410 as a replacement for the 7400?

Yeah, I'm preeeeeeeeee, preeeee-ballin'


Machine room (updated for 2019!): http://www.floodgap.com/etc/machines.html

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