You are not logged in.

#26 2017-03-13 20:06:06

MJ313
Member
Registered: 2014-09-23
Posts: 498

Re: NewerTech PowerPump accelerator for Quadra

If you want one LCGuy, just email me. Not sure if the guy has any more left at this point, but maybe he does. cheers!~

Offline

#27 2017-03-13 21:21:39

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,391

Re: NewerTech PowerPump accelerator for Quadra

Even if he doesn't, I can probably be persuaded to let you have mine, LC. I'm never going to play with it for real, just use some of the parts for hacking something silly so I'd rather you have it.

edit: not giving up RocketClocking playtime for anybody else though, so don't ask. wink

Last edited by jt (2017-03-13 21:22:44)

Offline

#28 2017-04-11 03:54:52

MacOS Plus
Member
Registered: 2015-12-09
Posts: 95

Re: NewerTech PowerPump accelerator for Quadra

It seems I did that eBay seller a huge favor by mentioning his auction here, seeing as he sold everything!

  Sorry it took so long for me to get back here to post about my experiments.  I initially had problems with booting the Q950 at all after installing the upgrade with no PPC accelerator present.  Turns out it was a bad internal SCSI ribbon cable.  So silly and annoying...

  Anyway, the parts are installed and working now.  One of the clip-on leads barely grabbed under the leg of the surface mount IC because the gap was too tight.  It's holding well enough now.  You have to be very careful with the part that goes in the nubus slot because the PCB is very narrow and flexible at the back end of the slot connector.

  This thing is so bizarre and model-specific its a wonder there was a profit to be made when it was new.  I guess we can thank Apple's over-inflated costing model for new computers for making this crazy device possible and giving it a market.  Here's all the parts laid out:

CAM00599.jpg

  I'll post some additional photos of the installation later on.  For now I can tell you I'm running the 040 chip near the top of the 'yellow' range in the control panel - 45MHz.  That's about a 33% overclock from the stock 33MHz.  So far it is not exhibiting any problems, but I'll test it in more detail later.

  As I mentioned before, I don't own an Apple 66MHz PowerPC upgrade card as called for by the product, but I do have a Daystar 100MHz edition which is virtually identical and runs at the same bus input speed.  I was willing to go for it and try seeing if it worked, presuming it responded purely to the bus input speed and nothing else.  The NewerTech add-on fan doesn't fit properly on the Daystar version, but it was close enough that I could hold it in place with a clothespin for the test.  (This seemed fitting given that I was already installing jumper wires with mere test clips!)  Once I was satisfied the 040 part of the equation was stable I went ahead and put in the Daystar and copied over the control panel.  The next challenge, as I alluded to earlier, was that the NewerTech control panel displays the speed adjustment slider in terms of the expected speed of the Apple 66MHz upgrade.  If you want to know what's going to happen with a 100MHz PowerPC upgrade you have to take this into consideration.  Divide the setting in half to get the actual bus speed implied and then multiply it by three to get the real speed of the 100MHz upgrade.

  And the verdict?  IT WORKS!!!  The utility provided to measure the actual CPU speed measures and displays the speed for the overclocked 100MHz Daystar unit properly.  I decided to try 120MHz on the first run since my aim was to create a "virtual WGS 9150/120".  I don't know how much headroom there would be to go faster, but at that speed it seems to be working without any issues.  I'm quite surprised and pleased!  Now, obviously you're not going to have quite the same speed with all the sub-components and bus-to-bus communications, but it doesn't seem far off the real 9150.  In the end I still have a far more usable Quadra than I started with, one I actually might be able to stand to use for something important, namely a vintage DAW.  This is pretty freaking awesome!

  If you really wanted to push the limits of the PowerPC you could ditch the junky and bulky stock heatsink and install a peltier cooler from a PowerPC nubus Mac.  You'd potentially foul the next nubus slot due to clearance issues, but that's only an issue if you have a long card in the next slot.  I'll consider this after I establish the long-term stability of the current config.  Maybe it can make it into the entry-level CPU speed territory of the clone Mac with Nubus and PCI slots - 133MHz no longer sounds out of the question!

Offline

Board footer

About ThinkClassic

ThinkClassic specialises in the maintenance, repair, restoration and modification of Vintage Apple and Macintosh computers. Ask questions and find answers about classic Apple desktops, laptops, accessories and peripherals.