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Dell 305W PSU Limits

Last response: in Components
November 27, 2009 12:05:09 AM

Hi folks, I have a Dell optiplex PC here with 305W it says, but I hear many people say that is equal to about 400W for other power supplies. I wonder if it is enough for a GTS250. Here is my system specs.

Intel Core 2 Duo E8400(3.0GHz, 6M, VT, 1333MHz FSB)
EM64T (64bit windows or linux supported)
DELL Cooling technology, extremely Quite
2GB DDR2 800MHZ High Speed RAM Dual Channel (2 Empty Slots available for upgrade)
250Gb SATA 7200rpm 8.5ms Hard Drive
Intel Integrated Video GMA4500 (Intel Q45 Express)
16x SATA Double Layer DVD-/+R/RW
Gigabit Lan 10/100/1000
DVI (Digital) Adapter Card

As you can see, i really need to add a decent video card, and something higher than a 9600gt.

Also, since the case is the minitower version (ATX version), am I able to change my PSU? I have heard conflicting posts on if it was possible.


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a c 248 ) Power supply
a b å Intel
November 27, 2009 12:13:31 AM

The general rule of thumb is a high quality 500 to 550 watt power supply with sufficient current (amps) on the 12 volt rail(s) can easily power a system with any single video card made. A high quality 700 to 750 watt power supply with sufficient current (amps) on the 12 volt rail(s) can power a system with two video cards operating in dual mode. There are a few exceptions like the new ATI Radeon HD 5XXX series cards which use less power due to their energy efficiency.

A high quality 500 to 550 watt psu will have a +12 volt rail rated at 40 amps. A high quality 700 to 750 watt psu will have a +12 volt rail rated at 60 amps.

Corsair, PC Power & Cooling, and Seasonic are some of the brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty. Lately we've been seeing a few other brands offering some high quality units. An example would be the Antec Earthwatts series which is an improvement over Antec’s older series psu’s.

Best solution

a c 243 ) Power supply
November 27, 2009 12:58:04 AM

Zeynex said:

am I able to change my PSU?

Yes, smaller units like the Antec EA 380/430/500 fit better ( 140 mm depth )
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November 27, 2009 1:04:02 AM

Does that mean as long as the PSU will fit, the connectors will match? I'm just worried that the PSU won't match with the dell MOBO.

Edit: It is an Optiplex 760.
November 27, 2009 2:59:18 AM

I'm just scared about frying my mobo or a new psu
December 1, 2009 9:13:52 AM

You can get Dell specific PSU's to avoid even the risk, but I THINK Dell is using normal ATX PSU's now. But you'll want to look into that first if you decide to try it.