933Mhz processor in a 733 Mhz quicksilver?

Although I don't think I've ever atempted that particular upgrade, I've moved 933MHz CPUs into Digital Audios (with the helper 12v wire), and I have one currently in a formerly dual 800MHz (that was running hot enough to fry eggs) .... all without any trouble.

You might try a PRAM reset on general principles, or turning the monitor off and then back on.

The QS 733 doesn't have an L3 cache, as I recall, and that might conceivably be a problem, but neither do DA 466s, and it doesn't bother them.

I'm stumped for the moment, but if I think of something I'll let you know.

Jon

Don't some of the QS 933 Mhz processors use ddr ram? I too was researching and remember seeing something that in some of the descriptions (unless what I was looking at was actually was for a MDD which for some reason people refer to as Quicksiver).

I was originally looking for a 933mhz cpu myself to use in a Digital Audio machine - the only problem I'd heard of was that the L3 might not work in the DA motherboard - and I've read nothing about it not being compatible with an actual Quicksilver motherboard no matter what version of motherboard. It should be plug n play. I did get an QS 867 Mhz cpu with the L3 cache, popped it into a Digital Audio motherboard (with the needed adaptations) and it booted up no problem - even the L3 cache was recognized. But it was unstable. I had originally thought that the motherboard was faulty but found that it was a piece of RAM, which I think was high density, not the low density that most desktops use. However I'm not being able to get it to work in a quicksilver 2002 motherboard now (the 2002 version will run drives larger than 128 gb from the board). I've posted more info in another post, so as to not confuse your question.

I'll let you know if I find anything different myself.

Karen

Hello Billy,

Firmware on my DA (updated)(with 933MHz CPU) is 4.2.8. Firmware on the dual 800 QS (with 933 CPU) is 4.3.3. I think it has to be at least 4.2.8 to work properly, but I don't know that that would affect your case.

RAM should be PC133 to work in the QS (and DA), but that wouldn't differ from 733 to 933. There is no particular sequence or pairing that is necessary. Occasionally memory can get more discriminating as you upgrade, but that's fairly rare.

If your 933 CPU shews signs of being burnt, I would suspect it may, indeed, be fried - although I'm not sure that's a 100% sign.

Do you have any more history on the 933 CPU? The reason I ask is that there exists a "Hong Kong" $39.99 version of the 933, which is really an overclocked 733 (and has no L3 cache), and which tends to be short-lived.

A happy Mac has a chime, but occasionally it will not chime but will still work, or (as you've discovered) chime and not work. I sometimes find this as I swap hard drives from different model Macs.

Only suggestion I have at this point is to swap known-good components.

But your 933MHz > 733MHz transplant should work if all the pieces do. (Trust me!)

Regards .... Jon

P.S. With regard to your friend - tell him to get a 933 QS; they're getting downright cheap on eBay now, and there's nothing like redundancy to ease a troubled mind - or a recalcitrant Mac ..... jws

Message was edited by: Jon Smith

Hello Billy,

Sorry to leave you hanging, but I don't know what else to suggest. I'm not a brilliant diagnostician; more like a parts replacer that just keeps plugging until he finds something that works.

If you're teaching yourself all about Macs, it helps to get a similar - or identical - Mac, so that you can swap components in and out; using parts that you know are good so that you have a base to work from. If you have just one Mac not working properly, you'll find yourself with too many independent variables going down too many blind alleys. It's easy for me to suggest that your processor may be fried, but until you either replace it with one that you know works or take it down to your friendly computer repair man - Apple or otherwise - and pay them to test it ... you won't know for sure.

When I started upgrading Macs, I often had three of the things surrounding me: one that was misbehaving, a second that I was swapping "known good" parts in and out of, and a third so that when the second misfired, I could at least go up on the internet and find the Apple Forum (or other site of brilliant diagnosticians) and get a fresh idea that I could then plug in and try.

Wish there were a foolproof and simple alternative method that I could suggest, but no. Perseverance, lad!

Good luck .... Jon

I've been a technician 46 years. Some times the magic works and sometime it doesn't.

Karbon wrote:

I did get an QS 867 Mhz cpu with the L3 cache, popped it into a Digital Audio motherboard (with the needed adaptations) and it booted up no problem - even the L3 cache was recognized.

Karen,

I hope you're still monitoring this older thread.

I would like to install the 867MHz CPU from my 2001 Quicksilver in my father's 466MHz Digital Audio. I was hoping it would be 'plug-and-play', but your reference to "needed adaptations" makes me wonder if there is something I need to know.

What, exactly did you need to modify?

I'm a little fuzzy on terminology, so bear with me: When you say you put the 867MHz CPU on the Digital Audio motherboard - is that the same as the logic board, or are you referring to the much smaller card that the CPU directly fits onto?

My plan was to leave the 867 CPU on the small board it was plugged into while in the Quicksilver, and move the small card and the CPU together to the Digital Audio. Is that doable?

The boot-up chime is generated in software, after the first part of the Power-On Self Test has passed, and booting is likely. If a valid source of software can be found, it will boot. That processor is working. It passed the test.

Your other complaint was that the screen did not light up. Did you pull the power cord out of the wall to make these changes? If so, you forced the PRAM Backup battery to attempt to retain the parameter RAM and NVRAM. If it was too low, the date & time, the source of software, the screen resolution, or the ability to even turn on could be lost.

Whenever you make a Hardware change, you should press the tiny Reset button. This article explains more:

HT1939- Resetting Cuda/PMU on Power Mac G5, Power Mac G4, Power Macintosh G3

I have put a Quicksilver 933MHz (a legit 933, not the over clock version that you see every once in a while on ebay) into Quicksilver 733Mhz. It work with out any problems.