In other words, has anybody got a 6500 or a 6500 PSU lying around who could dig one out and post all the voltages and wattage for each for me?
I need to adapt an ATX PSU to run the 6500 MLB in one of my hacks and it'd be a BIG help to know if I really need more than the 200w PSU that I've got my eyes on!

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I can tell you with absolute confidence that a 200 watt power supply will be enough. A 6500 should easily take less than 100 watts.

You probably no longer need it but here you go:



Can I put my 6500 back together or do you need more info from something else?

Yep, still needed it! That's EXACTLY what I was looking for, thanks a million, 'junky!

Go ahead and button'er back up!

Great idea posting a picI I'll do that for all the PSUs in my collection and we'll get'em all up for future reference . . .

. . . eventually! )

You are quite welcome.

Hey now that *is* a good idea. I'll dig some of mine out and join you. On a wiki page would be best. And a scan would be preferable to a photo, where possible - but that can be updated later.

Is there a way to figure out how much the maxium wattage would be per rail? :?:

For example:

- Maximum watts per 3.3v line

- Maximum watts per 5.5v line

- Total combined watts?

ohms law states w = I*V

so for example 12 volts with a MAX of 5 amps = 60 watts

(keeping in mind MAX means the most it can handle before killing itself, and really should not be tested)

Is there a way to figure out how much the maxium wattage would be per rail? :?:
For example:

- Maximum watts per 3.3v line

- Maximum watts per 5.5v line

- Total combined watts?

Click to expand...

Yes, but it's not trivial. You'd have to block the connection from the power supply for each voltage (BTW - it's 5 volts, not 5.5 - if yours is 5.5, it's too high), probably by putting tape on the contact for that voltage, then you'd use a multimeter with a high current ammeter to bring that voltage to the motherboard. A 2 amp ammeter should be fine for a 6500, but on startup the initial current would probably exceed 2 amps for a few seconds (which most ammeters can handle just fine).

A 6500 in general shouldn't take much power. The thing to watch for is the difference between continuous rated power and peak power. Some cheap power supplies only tell you peak, but good ones (with active PFC, Plus-80 type) will tell you the continuous rating. A 100 watt continuous would be more than enough to run a 6500.

Hey Johnklos,

Thank you for your response! I meant 5 volt rather than 5.5 volts - it was a typo - fat finger syndrome here hehe I was wondering because I have a CC modded with a 6500 board running of an ATX PSU . I sometimes get intermittend issues such as random bus errors, USB or NIC card sometimes not working properly etc. When I purchased my PSU several years back I was only checking the maximum watts it was rated for (200W) but not how much it can output per rail. Now that I've rechecked the PSU I noticed that the maximum amount of power it can output for 3.3v and 5v combined is just 65W -- not nearly enough I'd think! I realize that most of the later Performa-type Macs predominantly use 5v and 3.3v for voltage input so I used a more beefy ATX PSU which supplies 160W for 5v and 3.3v and these issues seem to be fixed now. So you think 100W+ on 5v and 3.3v should do the trick?