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#1
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EATX power supply recommendations?
My local supplier no longer carries the Antec 550watt EPS/EATX/24pin power
supply. They can special order an Enermax PSU that would be at least 550watt and EATX. Cost for the Antec would have been $170 Cdn. This PSU will be powering MANY hard drives (9 minimum). Can someone recommend a decent PSU that would drive a server mainboard (24pin). Thx! |
#2
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"Noozer" wrote in message news:ZuyTc.108136$gE.47596@pd7tw3no... My local supplier no longer carries the Antec 550watt EPS/EATX/24pin power supply. They can special order an Enermax PSU that would be at least 550watt and EATX. Cost for the Antec would have been $170 Cdn. This PSU will be powering MANY hard drives (9 minimum). Can someone recommend a decent PSU that would drive a server mainboard (24pin). FWIW, from the Maxtor specs, I can expect 9 drives to draw 8.5 amps on the 5v line and 6 amps on the 12v line. |
#3
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On Sun, 15 Aug 2004 00:54:17 GMT, "Noozer"
wrote: My local supplier no longer carries the Antec 550watt EPS/EATX/24pin power supply. They can special order an Enermax PSU that would be at least 550watt and EATX. Cost for the Antec would have been $170 Cdn. This PSU will be powering MANY hard drives (9 minimum). Can someone recommend a decent PSU that would drive a server mainboard (24pin). Thx! I'd use a Sparkle/Fortron before an Enermax, as Enermax uses a less conservative rating system on non-EPS, which might also apply to EPS. |
#4
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Noozer wrote:
My local supplier no longer carries the Antec 550watt EPS/EATX/24pin power supply. They can special order an Enermax PSU that would be at least 550watt and EATX. Cost for the Antec would have been $170 Cdn. This PSU will be powering MANY hard drives (9 minimum). Can someone recommend a decent PSU that would drive a server mainboard (24pin). http://www.pcpowercooling.com/products/power_supplies/ |
#5
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On Sun, 15 Aug 2004 01:50:19 GMT, "Noozer"
wrote: "Noozer" wrote in message news:ZuyTc.108136$gE.47596@pd7tw3no... My local supplier no longer carries the Antec 550watt EPS/EATX/24pin power supply. They can special order an Enermax PSU that would be at least 550watt and EATX. Cost for the Antec would have been $170 Cdn. This PSU will be powering MANY hard drives (9 minimum). Can someone recommend a decent PSU that would drive a server mainboard (24pin). FWIW, from the Maxtor specs, I can expect 9 drives to draw 8.5 amps on the 5v line and 6 amps on the 12v line. Yes/no/maybe Primary issue with supporting so many drives is spin-up current, which could be up to 2.25A 12V per drive. If your controller delays spinup of some, it will certainly help. This is also an area where the power supplies you're looking at may help, since they (should) have a 2nd, semi-isolated 12V rail for CPU (often listed as two 12V rails (CPU & I/O) on label) , so drive spin-up current is not as much of an impact on CPU power rail. In this regard a (properly designed) EPS unit is superior to traditional ATX PSU of same rated amperage. With any EPS unit in the wattage range you seek, 9 drives should not be a problem. You might tally up current usage on 3V/5V rails though, as often EPS units have lower 5V amps. "Quiet" operation is not to be expected though, with any PS2 size outputting that much power it should have fairly high airflow rate, and preferribly one or more pusher fans on chassis intake or behind drive bays (depends on server chassis type) such that PSU fans are moving pre-pressurized air, not doing the work of drawing air in though passive chassis intake. Of course ambient air temp can be significant, a 10C temp difference could be sufficient enough to offset somewhat lower airflow volume. The extent the airflow volume impacts you can also depend on PSU chosen. For example the Enermax line has MTBF rating based on only 70% of rated output, at 25C. Enermax gained their popularity back in the Pentium 3 era, when average system needed less power, but as systems continue to use more and more power the true limitations of an Enermax become more apparent. |
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