are all PSU's the same size? 26 replies

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carl4286

Revenge was here.

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14th December 2004

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#1 13 years ago

I have a dell 4700 series, and after buying an ATi Radeon x700 pro, I determined that my stock 305 watt (NOT 350) PSU might not be enough. The question is... will an ATX power supply fit in a Micro-ATX case? All of the power supply's that I can find higher than 350 watts are for an ATX case. Are they the same size, or do I have to find a PSU specifically for Micro-ATX cases? Last thing... I am not 100% sure its a micro-ATX, is there any easy way to determine it? (how big does it have to be to be ATX vs micro-ATX? or do ATX cases generally have more expansion slots, or drive bays?)




Kilobyte

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23rd November 2002

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#2 13 years ago

No, I'm afraid not. You may have to get a lower profile PSU. 400 watts is also recommended.

Sometimes a standard one will work, but quite often, with "Name" brand American computers atleast, they use a very strange, propraitary PSU, that often costs more than a new case. New cases usually come with PSUs, usually more powerfull than 400 watts.




Operative34997

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3rd June 2004

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#3 13 years ago

My brother just put a newer PSU into his Dell, and had a helluva time finding one that would fit. And his isn't even Micro-ATX. Dell does a very good job of making their PCs so that you have to buy their stuff to upgrade. He ended up getting an Antec 420W. But if yours is micro-atx, you're going to be hard pressed to find one with enough umphh.




C38368

...burning angel wings to dust

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14th February 2004

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#4 13 years ago

No. ATX, MicroATX, Mini-ITX, and various server class units all have different form factors. Additionally, many HTPC-intended cases have oddly shaped units to accomodate the case's small footprint.

Moreover, Dell has a very nasty habit of using proprietary pinouts on their motherboard's ATX header. In cases such as that, plugging a non-Dell PSU into the board (assuming you even can) will fry your motherboard--and possibly other components--the instant you power it on.




Kilobyte

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#5 13 years ago
carl4286I am not 100% sure its a micro-ATX, is there any easy way to determine it? (how big does it have to be to be ATX vs micro-ATX? or do ATX cases generally have more expansion slots, or drive bays?)

How'd we miss that? The easiest way, to check is to see how many CD-Rom drive bays your PC has. Micro ATX has 2. This won't work on many Dells though.

These aren't actually that helpfull.

PC Guide Case Form Factor

Form Factors.org ATX Form Factors.

Intel.com ATX Design Spec.

Post the Make, and Model of your PC, and someone can tell you if its micro ATX or not.

From the PC Guide Link above... z_inwin_iw500.JPG From the left: a microATX "micro tower", a microATX mini tower, an ATX mid tower, an AT/ATX full tower, a microATX desktop (above), and an ATX desktop (below).




reject

Slightly cooler than a n00b

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29th December 2004

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#6 13 years ago

the best small psu is the shuttle those are bombs can run oced 6800 and a64 setups the wattage isnt nearly as important as the quality if its heavy its good and well known brand is a must eg. enermax, zippy, topower, super flower, antec, ocz




carl4286

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#7 13 years ago

Dell doesn't have any new PSU's on their website, the only parts they will sell you for your particular system are mice, keyboards, and RAM.

The case has 2 cd drive bays (plus floppy), 2 hard drive bays, and 4 expansion slots... it's 14.5 inches tall, 7.25 inches wide, and 16.75 inches deep.

Here's the pic: 4700_chassis_front_314.jpg

I'll measure my PSU sometime today and get back to you, but from what I've told you, does it sound like a micro-ATX?




Mr. Matt VIP Member

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17th June 2002

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#8 13 years ago

At first glace that looks more like a midi case than a micro-ATX case... but the last time I saw a midi case was 1998, so I wouldn't be too reliable in that department :clueless:




C38368

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#9 13 years ago
carl4286The case has 2 cd drive bays (plus floppy), 2 hard drive bays, and 4 expansion slots... it's 14.5 inches tall, 7.25 inches wide, and 16.75 inches deep. I'll measure my PSU sometime today and get back to you, but from what I've told you, does it sound like a micro-ATX?

The ATX form factor (for motherboards) is 12"x9.6". ATX PSUs are about 3.5" tall. So a 14.5" tall case isn't going to be ATX, unless it's got some bizzare interior layout. 99% certain that it's a Micro-ATX unit, or a variant thereof.




M!tch VIP Member

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12th March 2004

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#10 13 years ago

how many pci slots does the motherboard have? a microatx usually has 3 and a full atx 5 or 6?


Thinking about it.