G4 533MHz ZIF - $20

[Bunsen]

Well, I haven't figured out the 9.5 setting yet, and the 9.0 is just what's been reported by the funky monkey.

What machine are you running, and is it a Newer ZIF with jumpers, or a PowerForce with dial? Is 10x the only one you've tested, or can you help us confirm any of the other settings?

When I say confirm, I don't mean for stable long-term performance; just long enough to verify the CPU speed corresponds (or doesn't) to the predictions.

 

[Bolle]

yea sure...

hmm testing would mean to rip apart my nicely done setup. My ZIF has DIP switches but the settings correspond to teh newer tech settings. its just inverted.

no jumper means for me to set the switch to the "on" position.

Im running it in my PM 9600 as i said using a daystar ZIF carrier.

i may test the 9x setting if i can find some time.

 

[FunkyMonkeyPiE]

My 200 watt power supply in the B&W has just now bit the byte, and i personally blame everyone here.

For weeks I have been getting freezes everytime my Optical drive started ramping up to top speed or i attempted to do multiple gigabyte transfers over LAN. I should have known better than to load up all the slots in the mac and not check the wattage on the PS, which it turns out is a paltry 200w. So a new PC-ATX 420w is going in tomorrow, and I'm going for the magic 700Mhz @ 100 bus mark (B on the dial), as it would boot to at least the mouse and rounded corners at that setting. Just something to consider when attempting the higher speeds, those olde PS units can probably power the CPU but as soon as something else drains the current, (like a hard drive) they crash, i suspect that it is the on-chip cache that is the real culprit. I find that heat is not really the issue as there is no increase in voltage as you can do with PC boards when overclocking.

On another note, I noticed that there are only 6 pins coming out of the dial on the G4 ZIF not the 8 or 5 that i would have expected for 16 different settings.

I am curious what y'all use for stress testing for stability, as there are heaps of apps on the WIN-PC side but not much for running the cpu at full tilt on the mac. For quick tests i drop in a cd and dump to mp3 in iTunes, but there is no error checking on that, just full cpu usage.

 

[SiliconValleyPirate]

I find that hard to believe personally, given that anytime I've over-clocked anything it's crashed under some sort of heavy load as a result, and disk access or network access is a prime cuplrit as that puts a lot of traffic across the CPU. If it was true then my B&W running a stock G4/500, a Radeon 9200 and 3 hard drives (2 of which were 10krpm SCSI) would also have struggled, and it doesn't. Faster CPUs have a bearing on it, but also consider that people run 1GHz G4s and G3s in B&W PowerMacs without issues. Although only rated at 200W, the PSUs are very good ones and the 200W output rating is a pretty accurate number, rather than these cheap crappy PC PSUs that say they are 500W and are actually substantially (and in some cases scarily) less under heavy load.

I think you may find the reason it's locking up is the CPU is running too fast, and can't cope with the memory swapping that that sort of ethernet traffic generates, and it's crashing. I suggest you get hold of the Altivec Fractal Generator and run a few repeated runs on it and see if that locks it up. If it does it's time to hang up the over clockers tools and step it down a few notches. It's a typical over-clockers reaction to blame everything else rather than the decidedly risky over-clocking they are messing around with [] ]'>

You'll either suffer lockups for the rest of eternity, or blow the CPU completely (much less likely, but more so the higher you go). Even if you get it stable at a higher speed it'll last a lot less long than it would at it's factory setting, and, given it's probably second hand anyway, that would have me worried about it's life span.

 

[Bunsen]

On another note, I noticed that there are only 6 pins coming out of the dial on the G4 ZIF not the 8 or 5 that i would have expected for 16 different settings.

Two grounds?