So, I decided to put that together for you and meassure the watts.
I used a PowerMac G4 "AGP", 500MHz Model (with Sonnet 1,2GHz installed, which uses 20-40W more).
I have managed
a total of 7 drives. Didn't want to get further, but one can imagine, that you can put 2 additional drives in the optical bay, if you like.
If I connect only 6 drives and start from the internal IDE Drive, I get a
peak of 156W at start-up, which
gets down to 105W after having loaded the OS completely. (7th drive not connected).
If I start from the 7th drive via FW. I get a
peak of 184W. (the FW-drive gets its power via the FW-cable)
The PSU of this G4 has 237W and the bumper says you should
not exceed 128W over long durations. (I have an ATI Rage 128 Pro in it, btw. wouldn't want to test it with a card that draws more power.)
SET-UP:
external FW400-Drive = Startvolume
Drive 1 = 120GB WD1200BB IDE Drive
Drive 2 = Toshiba 3TB SATA
Drive 3 = Hitachi 1TB SATA
Drive 4 = WD 2,5TB SATA
Drive 5 = Hitachi 1TB SATA
Drive 6 = Samsung 2TB SATA
When I browsed through the folders or clicked with the mouse on the desktop the consumption would go
up to 114W. Doing nothing the consumption went
down to 93W.
In another test (some time ago, without the drives) I noticed that this Apple PSU causes more power consumption, when it gets hot. I did an iMovie export and the export startet at 90-100W, after the fans got loud it got up to about 110W.
Also, I found out that
the Apple PSU (this one at least) does not have a good PFC. I tested all components in my room and found out that it was the PSU.
I can make my TV show the channel info, if I click "play" in iMovie. The devices are not connected, only that all powercords go to the same powerline on the wall. I also can stop a recording in iMovie when I put on the light in my room.
This evening with the 6 drives, I could force my SAT-Receiver-Box to go to standby clicking on the drive name of another drive, the drive is connected via FW externally (not the one that is shown above).
Further thinking:
I would not do this Drive craziness with the stock drive without additional cooling, if I may suggest something.
The other possibility is to be more save and use another PSU. Also I did not test, what happens when the ODD bays are occupied by a 8th and 9th drive.
The Quicksilver G4 has something like 347W (right?). The CPU is a 7455, like my Sonnet, so the base consumption should be around 90W and additional drives should work. But I did not do the math on the speperate 12V lines in the PSU, though! So still, beware! I will not be held responsible for damage to you or your hardware.
Picture: (scroll down to end)
Look at the picture for the setup. (I routed the internal FW out through one PCI-Slot cover. Oh, I forgot to look at the temperatures...
I had to slice the picture, because it was to big, but otherwise you can't read the notes I made. You have to download the pictures and place them besides one another...
Temperature protocol in °C:
- 120mm fan in front of PSU not activated!
(I am browsing through the drives and copying files)
0min =
27 (Drive1)
27 (Drive3)
27 (Drive5)
10min = 26, 30, 31
20min = 28, 35, 35
30min = 34, 38, 38
40min = 34, 39, 39
42min = 34, 40, 40
46min = 36, 40, 41
50min = no change
56min = 36, 41, 41
63min = 36, 42, 42
70min = no change
80min = 37, 42, 43
92min = 37, 43, 43
104min = 38, 43, 43
The G4 has no temperature sensors, but the IDE BUSes and the Macally SATA-Card support SMART on the Drives, so I got the temperatures from the Drives own internal temp sensors.
The three drives with sensors are on the bottom, above them are the big drives, that are connected to the SIL3124 non-Mac specific card.