450 watts enough for my system?

[Zebo]

I would'nt screw around with any of that junk powering two opterons and highend video. Get the best.
http://www.pcpowercooling.com/pdf/Turbo-Cool_510_vs.pdf

 

[Gamingphreek]

I agree with Zebo save your money and get the PCP&C or the OCZ.

The Zalman and the Tagan are OK if you really dont feel like waiting though.

-Kevin

 

[tcsenter]

I agree with Zebo save your money and get the PCP&C or the OCZ.

"Save" money? The PC P&C retails for over $200 and for that he doesn't even get independent +12V rails for processor power and I/O. Opterons are actually not that power hungry. The 2.4GHz Opteron 850 requires no more than 9A from +12V at MAX load (8.83A based on AMD specs). By comparison, Athlon XP3200+ requires 8.0A at MAX load.

An overclocked Radeon X800 XT manages to load +12V by not more than 3.5A, according to X-Bit Lab's excellent series on power consumption of video cards.

10K Raptors are no more demanding of current than their high performance 7200RPM PATA cousins. Hard drives generate max load during drive spin-up (up to 3A). Thereafter, modern drives require only about 1A~1.5A max for read, write, and seek operations.

Calculating for dual Opteron 850's (all values MAX load on +12V):

CPU (9A) x 2 = 18A
Radeon X800 XT (O/C) = 3.5A
4 HDDs = 6A
2 Optical Drives = 3A
4 Case Fans = 1A
2 CPU Fans = .5A

+12V Totals:

+12V1 (CPU1 + CPU2) = 18A
+12V2 (I/O) = 14A

 

[tcsenter]

Originally posted by: Mrvile
But I need (or at least should have) a 24-pin connector, I found a Tagan (made by E-Power, right?) 480W with a 24-pin and two SATAs for 78 bucks here:

http://www.ajump.com/ajump/pro...034&dept%5Fid=2163

For about $100, the Fortron Source FSP550-60PLN EPS12V (Active PFC) has separate +12V rails, higher +12V ratings than the Tagan, and is designed for server applications.

+3.3V @ 27.0A
+5V @ 29.0A
+12V CPU @ 18.0A
+12V I/O @ 18.0A

Full Specs: FSP550-60PLN

All around the best deal going that I'm aware of on a high-end PSU.

 

[RussianSensation]

Originally posted by: tcsenter

Originally posted by: Mrvile
But I need (or at least should have) a 24-pin connector, I found a Tagan (made by E-Power, right?) 480W with a 24-pin and two SATAs for 78 bucks here:

http://www.ajump.com/ajump/pro...034&dept%5Fid=2163

For about $100, the Fortron Source FSP550-60PLN EPS12V (Active PFC) has separate +12V rails, higher +12V ratings than the Tagan, and is designed for server applications.

+3.3V @ 27.0A
+5V @ 29.0A
+12V CPU @ 18.0A
+12V I/O @ 18.0A

Full Specs: FSP550-60PLN

All around the best deal going that I'm aware of on a high-end PSU.

That seems like an excellent power supply, but "+3.3V and +5V total output shall not exceed 150watts" - isnt that kinda weak considering new power supplies usually have in excess of 240 on those 2?

 

[Operandi]

Originally posted by: RussianSensation

Originally posted by: tcsenter

Originally posted by: Mrvile
But I need (or at least should have) a 24-pin connector, I found a Tagan (made by E-Power, right?) 480W with a 24-pin and two SATAs for 78 bucks here:

http://www.ajump.com/ajump/pro...034&dept%5Fid=2163

For about $100, the Fortron Source FSP550-60PLN EPS12V (Active PFC) has separate +12V rails, higher +12V ratings than the Tagan, and is designed for server applications.

+3.3V @ 27.0A
+5V @ 29.0A
+12V CPU @ 18.0A
+12V I/O @ 18.0A

Full Specs: FSP550-60PLN

All around the best deal going that I'm aware of on a high-end PSU.

That seems like an excellent power supply, but "+3.3V and +5V total output shall not exceed 150watts" - isnt that kinda weak considering new power supplies usually have in excess of 240 on those 2?

It would be nearly impossible to approach 150watts on those rails with a modern system.

 

[0roo0roo]

a bit on psu's http://www.silentpcreview.com/article28-page1.html specs tend to be shady

 

[tcsenter]

That seems like an excellent power supply, but "+3.3V and +5V total output shall not exceed 150watts" - isnt that kinda weak considering new power supplies usually have in excess of 240 on those 2?

Few PSU that have a strong +12V bias exceed 180~200W combined MAX on +3.3V and +5V. While I similarly felt that 150W combined was underwhelming, you're not going to need more than that.

Look at this system power profile from THG:

+3.3V = 32.67W
+5.0V = 110.00W

Total (MAX) Combined = 142.67W

On at least one account, the values used in this profile for +5V or +3.3V are over-estimated. The AGP load assumes the video card will be drawing primarily from the AGP connector, but the X-Bit Labs test shows much lower numbers through the AGP connector for Radeon X800 XT, relying instead upon the auxillary +12V. This will vary to some degree from vendor to vendor, depending the implementation, but not much.

On the other hand, the rating for the memory module is about 5W too low. Using Micron's awesome DDR System Power Calculator (Excel), I arrived at 15W each assuming a 512MB PC3200 module composed of 16 - 32Mx8 DDR400 devices operating in DDR400 mode @ CAS3. 15W is a worse case scenario, based on a MAX load memory utilization profile.

Both Intel and AMD recommend calculating only 80% of total system I/O power because it is extremely unlikely to have all components simultaneously placing their max loads on the PSU, even transiently. And as I mentioned, Fortron Source is well known for conservatively rating its PSUs. If Fortron's specs say +12V @ 18A, that is not a 'peak' rating. It will do 18A continuously all day long, day after day.

 

[CraigRT]

for a sweet system like that, don't skimp on the PS

go with an OCZ or PC Power and cooling