[veryniceguy2002]

I just upgraded my B&W G3 with a G4 processor rated 500MHz. Currently I am running it at 550MHz without problem.

Now I want to overclock a bit more, but I reckon I might have a heat problem (it's a rev. A B&W G3, with a shorter heatsink than the rev. B model). Therefore I would like to know does anyone have put in a CPU fan on put on a B&W G3? In particular I would like to know the following:

1. What type of CPU fan should I use?
2. How do I secure the CPU fan into the processor?
3. Do you have the fan sit on top of the CPU or on top of the heat sink?
4. How can I connect the fan's power wire back to my motherboard of power supply?

[Waragainstsleep]

I have a short heatsink and a CPU fan installed in my B&W G3. I built mine from parts bought on eBay, and while I got the case, Power supply, motherboard and CPU, I had no heatsink or fan.

I pulled both from an old Cyrix 686 motherboard I had lying around the place. Just cleaned up the fan and slapped it in place. (Just had to bend the heasink clip to fit properly.)

In answer your your specific questions:

The fan goes ON TOP of the heatsink! If you try it the other way around, you will very likely melt your new CPU.

The fan is simply screwed into the four corners of the heatsink. You just have to make sure your screws are wider than the gap between the blades on the heatsink.

Most fans of this type have the same power connector as a disk drive. You should have at least one of these spare on your stock Power supply, and if for any reason you don't, most fans can also be daisy-chained so you can plug a drive into the fan and the fan into the PS.

As for where to get one, I would imagine the best places are eBay and www.overclockers.com (oc have a site in the UK if you happen to be there, maybe they have other sites around the world too). It shouldn't cost much either.

One thing: when you do this, the fan will stay on when the machine is put to sleep. I'll get round to sorting this before too long though.

[bowwowman]

Originally posted by veryniceguy2002:
I just upgraded my B&W G3 with a G4 processor rated 500MHz. Currently I am running it at 550MHz without problem.

Now I want to overclock a bit more, but I reckon I might have a heat problem (it's a rev. A B&W G3, with a shorter heatsink than the rev. B model). Therefore I would like to know does anyone have put in a CPU fan on put on a B&W G3? In particular I would like to know the following:

1. What type of CPU fan should I use?
2. How do I secure the CPU fan into the processor?
3. Do you have the fan sit on top of the CPU or on top of the heat sink?
4. How can I connect the fan's power wire back to my motherboard of power supply?

Just to clarify a bit to what WS posted above:

You should be able to get a thin, flat, square CPU fan at any computer/electronics store...look for one that is made for ZIF-socketed CPU's like in windblows boxes, and also one that has a 4-pin molex connector. This will connect to the extra power lead(s) that come off of your power supply.

If all else fails and you can't find the above, you should be able to find the kind that fits into a PCI slot, they connect the same way and will suck air out the back of the tower, albeit at the expense of one of your slots

For the screws, I used some 2.25" long flat-headed machine screws, with fine threads, one on each corner. Be careful putting them in, as you are screwing them into ALUMINUM, which is VERY soft and easily stripped, so dont overtighten them.

[yikes600]

MacGurus.com sells a B&W G3 fan kit. I just took their idea and bought an identical fan for a few bucks somewhere else. With it, my OWC G4/500 ZIF has been running solid at 650MHz for 10 months without a single crash. 700MHz boots just fine, but crashes after about ~4 hours of use.

[veryniceguy2002]

Originally posted by yikes600:
MacGurus.com sells a B&W G3 fan kit. I just took their idea and bought an identical fan for a few bucks somewhere else. With it, my OWC G4/500 ZIF has been running solid at 650MHz for 10 months without a single crash. 700MHz boots just fine, but crashes after about ~4 hours of use.

yikes600,

When you say "my OWC G4/500 ZIF has been running solid at 650MHz for 10 months without a single crash", do you actually power off at night time, or did you really running it 24/7 when any problem?

When you say it runs at 700MHz but crash after about ~4 hours of use, what's the symptions? Does it use freeze out or does Mac OS X give you a warning or something like that?

[yikes600]

I have the occassional restart for software updates and such, but I never turn off my mac. At 700MHz, the machine will either have programs unexpectedly quit (crash) or the machine locks up. I'm sure if I spent more time with it I could get it to work. Someone suggested using a shim between the heatsink and CPU which sounded like a good idea. Anyway, I gave the mac to my Mom a couple days ago and moved to a Digital Audio G4, so I think it will be staying at 650MHz.

[bowwowman]

Originally posted by yikes600:
MacGurus.com sells a B&W G3 fan kit. I just took their idea and bought an identical fan for a few bucks somewhere else. With it, my OWC G4/500 ZIF has been running solid at 650MHz for 10 months without a single crash. 700MHz boots just fine, but crashes after about ~4 hours of use.

Yep, my fan is similar to that one, just thinner and slightly larger overall. Works like a charm and only cost me $8 at BustBuy

P.S.....I run my G4/500 at 650mhz too!

[veryniceguy2002]

Originally posted by bowwowman:
Yep, my fan is similar to that one, just thinner and slightly larger overall. Works like a charm and only cost me $8 at BustBuy

P.S.....I run my G4/500 at 650mhz too!

What size (dimension) is the fan that you use?

I still not sure how to secure the fan into the heatsink? Do I have to drill the screws into the heatsink fin?

[yikes600]

Originally posted by veryniceguy2002:
What size (dimension) is the fan that you use?

I still not sure how to secure the fan into the heatsink? Do I have to drill the screws into the heatsink fin?

The MacGurus.com link has the fan dimensions and step-by-step mounting instructions.

[bowwowman]

Originally posted by veryniceguy2002:
What size (dimension) is the fan that you use?

I still not sure how to secure the fan into the heatsink? Do I have to drill the screws into the heatsink fin?

My fan is 45mm X 45mm, or approx 2" X 2". And NO, you dont have to drill the screws into the HS, just use screws that are large enough in diameter to fit snugly into the tines of the HS. Thats all it needs to be secure

[MORT A POTTY]

I wish they would have used centegrade as their temperature instead of our shitty system that makes zero sense... now I gotta convert.

[omar96]

Doesn't a plain Socket7 CPU heatsink/fan fit?

[veryniceguy2002]

Originally posted by omar96:
Doesn't a plain Socket7 CPU heatsink/fan fit?

What is the size specification for a Socket 7? (No, I don't have a PC at home, so no idea about Intel specification)

[Rowen7]

From what I have read just a socket 7 fan and heat sink. I have also heard of some people using Pentium Pro and Pentium Two heat sinks and fans for their G3 systems. I myself put in a new 120mm fan that although a bit louder you can feel the air it moves and pushes onto the board, cpu, and all.

I would suggest going with a 120mm fan for over all cooling (the heat displacement has to go somewhere.) and then going for a new heatsink and fan, which radioshack seems to have a set of two (small and big)

Although I don't know what would be best with a fan and over clocking... the G3 1.0ghz, G4 500mhz, vs the G4 600mhz. And their respective overclocking and application running. I still debate what to get actually.

[Waragainstsleep]

The choice between those upgrades usually comes down to what they will be used for. G4 for multimedia, G3 otherwise.
The G4/500 (and possibly the 600 from OWC) is either a PPC7400 or a 7410. These are favoured over the faster G4s for three reasons:
1) Price.
2) The faster ones require the system bus to be donwclocked.
3) The later chips (7447 et al) have fewer pipelines and therefore a notably slower 74XX chip is often just as quick in real life applications. I'm not sure how many pipelines the fast G3s (750GX?) have, but I gather they tend to outstrip most of the G4 upgrades on non-altivec tasks.

[veryniceguy2002]

Originally posted by Waragainstsleep:
The choice between those upgrades usually comes down to what they will be used for. G4 for multimedia, G3 otherwise.
The G4/500 (and possibly the 600 from OWC) is either a PPC7400 or a 7410. These are favoured over the faster G4s for three reasons:
1) Price.
2) The faster ones require the system bus to be donwclocked.
3) The later chips (7447 et al) have fewer pipelines and therefore a notably slower 74XX chip is often just as quick in real life applications. I'm not sure how many pipelines the fast G3s (750GX?) have, but I gather they tend to outstrip most of the G4 upgrades on non-altivec tasks.

Originally I planned to get the 1GHz G4 upgrade from Sonnet. However, there were two little yet important facts for which I changed my mine and get an OWC G4 upgrade (chip rated at 500MHz; it's a PPC7410):

i. After the Sonnet upgrade is installed, the Mac cannot be booted from the CD/DVD drive by pressing the C key at all.
ii. The Sonnet upgrade cannot be performed which there is SCSI card attached (I only had an SCSI hard drive for my B&W G3, that would mean the only way for me to d othe upgrade is to put in a IDE hard drive just to do the CPU upgrade)

I went for G4 instead of G3 because I want Altvtec for for video and graphic intensive stuff.

[omar96]

Rowen, that'd be entertaining to see...a Pentium II cooler (considering all desktop PII's were Slot 1) is for a cartridge not much different in size from a Sega Genesis cart...

Pentium 1 is Socket 7, Pentium Pro would work too, I'm guessing, but I dont' have a PC that old anymore. I've got a 2lb chunk of copper on both Athlon64 machines, and my Macs are both using OEM heat sinks for now.

[yikes600]

veryniceguy you should be able to get that OWC G4/500 up higher than 550. They guarantee it for 600MHz operation, and I (and many others) have clocked it to 650MHz easily. Some even 700MHz... mine crashes at 700 after an hour or so.

[veryniceguy2002]

Originally posted by yikes600:
veryniceguy you should be able to get that OWC G4/500 up higher than 550. They guarantee it for 600MHz operation, and I (and many others) have clocked it to 650MHz easily. Some even 700MHz... mine crashes at 700 after an hour or so.

Yes I know... I'm just taking my time to clock up by G4 slowly when I'm satistified with one particular setting. I used to work on chip design industry, so I knew at times overclocking (just for 50MHz) can push over the margin. That's why I would like get a fan for my G4 chip to help a bit.

I'll probably clock up to 600MHz sometime this weekend and see if the performance of digital TV on my Mac improves.

[jkehn]

when i overclocked my b & w i put on a cpu fan to be safe. what i did was went to my local pc club where they sell used parts. there i found an individual cpu fan. it piggybacks onto one of my hard drive's power plugs. this means no cutting into your powersupply, just plug n' play. all i did was plug it in and screw the fan directly onto the stock heat sink. it works great!

[Platypus222]

Originally Posted by jkehn

when i overclocked my b & w i put on a cpu fan to be safe. what i did was went to my local pc club where they sell used parts. there i found an individual cpu fan. it piggybacks onto one of my hard drive's power plugs. this means no cutting into your powersupply, just plug n' play. all i did was plug it in and screw the fan directly onto the stock heat sink. it works great!

Don't worry, I will check in on Veryniceguy to make sure he's still alive to read your post.
(Your response is only 6 months late. dont sweat it. hehe :-D)

[veryniceguy2002]

Originally Posted by Platypus222

Don't worry, I will check in on Veryniceguy to make sure he's still alive to read your post.
(Your response is only 6 months late. dont sweat it. hehe :-D)

Thank you very much Platypus222.

I am still alive and well, and my footy team still winning on the weekend!

PS I haven't install the fan yet, so jkehn's comment is useful.

[Platypus222]

My footy team is doin' better than yours i bet, hehe :-)

[veryniceguy2002]

Originally Posted by Platypus222

My footy team is doin' better than yours i bet, hehe :-)

I doubted it... What's your footy team?