Power Supply Capacity

I'm building two identical systems and I'm wondering how much power supply capacity I'll really need. These computers will have a very specific function and system expandability will NOT be an issue. What's more important is performance and portability. Heres how the systems will be loaded.

Intel D865GLC micro ATX motherboard
Intel P4, 3.0 GHz, 800 FSB, HTT
512 megs DDR 400 (PC3200) RAM (possibly doubled later)
1 - 40 GB PATA IDE system drive
1 - 80 GB SATA IDE program drive
1 - 52x 24x 52x CD-R
from 1 - 3 case fans.

I'm planning on NOT installing a 3.5 floppy drive unless the case I select would make it awkward not to have one. I definitely want a micro ATX case because of the portability issue. Some of the micro ATX cases I see have power supply capacities as low as 200 watts. I'm wondering if 200 watts is enough in this circumstance. I'd also welcome micro ATX case recommendations.
MarbleAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Luc FrankenEMEA Server EngineerCommented:
Hi Marble,

I'd say, at least 300Watt for this system

Greetings,

LucF
Glen A.IT Project ManagerCommented:
even with onboard video you're looking at A LOT of power for this system, a minimum configurator I use shows 302W, (of course, without the floppy it's only 297W) so you'd probably want 350W for this pc, to be safe.

the P4 800Mhz cpu's draw 89W alone, fyi.

http://www.jscustompcs.com/power_supply/

Just so you know, those 200W power supplies are designed for something along the lines of an intel 2.0 with onboard everything, 256Mb, 1 hard drive, a cdrom and floppy.

When you start adding another hard drive and a powerful cpu, a case like this is most likely out of the question.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
blumbraCommented:
Agreeing with AlbertaBeef.  Since all of your drives don't generally run at the same time you would probably be okay with a 300watt.  However, I estimate a max draw of about 338 watts.  I would also say 350 would be a safe bet.  

Bryan
MarbleAuthor Commented:
Thanks for the URL for calculating power requirements. I've been looking for something like that.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Desktops

From novice to tech pro — start learning today.