AMD processor power requirements

[IronBits]

What does an XP2400 require, or put out, or what ever it's called
Some where between 60-130 watts... :bang:

[magnav0x]

You looking to try and get 3 boards powered under a single 400w PS IB? I was asking myself that same question earlier today.

[Paratima]

Don't know what you're looking for, exactly...

But you can try (I know it's a long shot) www.amd.com (http://www.amd.com) . :p

[magnav0x]

Processor /MHZ/Typical/Maximum
1700+ 1467 44.9W 49.4W
1800+ 1533 46.3W 51.0W
1900+ 1600 47.7W 52.5W
2000+ 1667 54.7W 60.3W
2100+ 1733 56.4W 62.1W
2200+ 1800 61.7W 67.9W


You could probaby make an educated guess as to what the 2400+ would use.

This was taken from AMDZone
http://www.amdzone.com/articleview.cfm?articleid=1124&page=2

[ECL]

According to the AMD data sheet, the 2400+ typically dissipates 62 watts, with a maximum of 68.3 watts.

I think you'll need to use the maximum figure, since you'll probably have the thing running at 100%.

[IronBits]

Thanks guys - finally getting somewhere :D


Model Core FSB L2 Core Max Thermal Power
2200+ 1800 MHz 266 MHz 256KB TB-A 67.9 W
2400+ 2000 MHz 266 MHz 256KB TB-B 68.3 W
2600+ 2133 MHz 266 MHz 256KB TB-B 68.3 W
2700+ 2167 MHz 333 MHz 256KB TB-B 68.3 W
3000+ 2167 MHz 333 MHz 512KB Barton 74.3 W
http://www.tomshardware.com/newsletter/vol3/13/cooler.html

[IronBits]

Now, how much power does an Antec 400 watt PS use to run itself? ;)

[magnav0x]

Interesting question :D

[magnav0x]

I'd have to say (sorry for the general answer, as I couldn't tell you without hooking it up myself) somewhere in the range of 560-640 watts

[magnav0x]

Here are some input specifications form antec:
http://www.antec-inc.com/specs/sl400_spe.html


INPUT

Input Voltage
115VAC/230VAC

Input Frequency Range
47Hz to 63Hz

Input Surge Current (p-p)
< 50A @115VAC
< 80A @230VAC

Input Current
10.0A for 115VAC
5.0A for 230VAC

Hold-up Time
< 17ms at Full Load

Efficiency
> 68%

EMI/RFI
FCC Class B


Taken into consideration that the efficiency (input vs output) value is 68% it's safe to say it'll use about 589W

[IronBits]

No way a PS is gonna chew up that kinda power to feed 68 watts :confused:

[magnav0x]

No, that's to output 400 watts. To output 68 watts you would be looking at about 99 or 100W. For that particular power supply you are looking at an input of 1.4725 watts to output 1 watt. That's where the 68% efficiency comes into play.

[IronBits]

Ok, now we are getting some where :confused: ;)

1.5 watts x the number of watts needed + watts needed= total watts.

All things being equal...

Using same brand mobos w/onboard vid+nic, ram, proc+hsf = RequiredWatts (RW)

RW x 1.5 watts + RW = Total watts you pay for right so far?

Now, if I ran two mobos off same PS...

RWx2 x 1.5 watts +RW+RW = Total Watts I pay for.

Where is the bargin in running 2 boxen on 1 PS, sans the heat issue and coolness factor?

[magnav0x]

Where is the bargin in running 2 boxen on 1 PS, sans the heat issue and coolness factor?

I'm pretty sure the only reason you would want to do it is because of less heat, less space, and of course "less cost" (because they don't have to buy another power supply. Personaly I would only want to do it because of the smaller amount of space needed for the farm. BTW I get one of my cars (the $500/mo car) payed off in 2 months, so expect me to start up some farmage :cheers:




Using same brand mobos w/onboard vid+nic, ram, proc+hsf = RequiredWatts (RW)

RW x 1.5 watts + RW = Total watts you pay for right so far?

Now, if I ran two mobos off same PS...

RWx2 x 1.5 watts +RW+RW = Total Watts I pay for.


Not quite sure I follow. Here's how I'd figure it.


Using same brand mobos w/onboard vid+nic, ram, proc+hsf = RequiredWatts (RW):

With 2 power supplies:
(RW x 1.5w) x 2 = Total watts the PS is drawing from your wallet.

With 1 power supply:
(2 x RW) x 1.5w = Total watts the PS is drawing from your wallet.



But you are right. It would still come out to the exact same (or very close) wattage/cost. The only way you would actualy save money from this is the fact that you would save about $20 on the cost of another power supply, because it should only cost $10 to make the splitter.

[IronBits]

Well, I'll have my big brother the electrician do the testing soon.

One of my younger brothers (and I also) think that when you turn it on, it's costing you 400 watts, regardless of what you are pulling, as it is rated output remains constant. (assuming 400 watt PS)
I don't think there is an automatic turn up the juice thang inside it when you add components... (techy talk) :D

This means you can run 2 200watt PS for the price of one 400 watt, but, you can't run a mobo on that, so, you run two mobos off a 400 watt to get er done.

But, I'm probably dreaming :sleepy:

Good news on the car !!! :|party|: :cheers:

[magnav0x]

I don't think there is an automatic turn up the juice thang inside it when you add components... (techy talk) :lmao:

Almost lost me with that one IB. You are probably right though IB. I assume a PS will pull whatever power it's capable of at all times. Otherwise they would be variable power supplies and much more expensive. So yeah...you will actualy save money by running 2 mobos on one PS apposed to running 2 mobos with 2 power supplies. I'm no electrician either, so let me know what your bro says :fireboun:

[IronBits]

Quick update from Larry

"A power supply is like a transformer.
The size of the power supply means that is the maximum amount it can deliver but, the computer parts determine how much power (watts) it will need to operate.

I don't believe the cpu, motherboard and hard drive will use 150 watts but I will try to get some testing done to see what the computer uses"

I asked him to test the following:

Run it with no HDD or CD-ROM 1st.

Only mobo/proc/hsf/memory/video/nic -
it will say missing operating system, but ok for this test.

Then plug in the HDD, wait for OS to settle down - test again.
Then start the client so the CPU is under full load and test again.
Then run disk optimizer, while the client is running, to make the disk get busy.

That should give us a some good baselines
no HDD disk - entire system idle
HDD disk and cpu idle (after OS settles down)
HDD disk idle and cpu full throttle (what we usually have)
HDD full throttle and cpu full throttle

Use your new XP2400 for the testing please -

[magnav0x]

Sounds good, don't suppose he'd do a diskless boot and have it run a client to test power usage under those circumstances. Realy wanting to know if I could slide by using 3 motherboards with one power supply

[IronBits]

I'd go ask Steve Watkins, he's the PRO at this 2 mobo 1 PS thang. :)
Larry has no way to boot diskless... yet ;)

[GHOST]

Man, oh man, you guys have been busy today! Power use, two for one , remote boot, GAHnix.

Keep it coming, I'm following as fast as I can!

[Fozzie]

but doesn't the PSU only have one ATX connector?

Can you even get splitters for this?

[magnav0x]

Fozzie, here is a link showing how to make a Y splitter. You have to buy an ATX extension in order to get the other ATX connector