Need to chhoose a decent spec mATX PSU

March 23, 2012 at 04:39:06
Specs: Windows 7, i7 2600k / 4x2gb DDR3
need a matx psu capable of running i7 2600k

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March 23, 2012 at 06:24:01
The only reason to get an mATX PSU would be because you have an mATX case that doesn't accept standard ATX PSUs. Is that what you have?

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March 23, 2012 at 09:55:40
Hi. Yes, it's a small form factor case and needs to be micro atx, currently has a 300w PSU in but with upgraded processor i3>17 and extra RAM (2x2gb) and potentially more at a later date, will need extra power. Was thinking will have to double the 300w, but not sure that's definitely necessary? Have seen the same Alpine in various places for a decent price but also seen some bad reviews so not sure whether to go ahead with it thanks for your help.

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March 23, 2012 at 12:37:04
Most of the green or high efficiency ones would be a good choice. There may be some enterprise level out there too.

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March 23, 2012 at 13:03:10
"Was thinking will have to double the 300w"

What did you add that's sucking up so much power? You didn't list the i3 CPU, but your i7 is rated at 95W. It may be only a 20W difference in power consumption due to the CPU upgrade. And RAM certainly doesn't eat up much wattage.

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March 23, 2012 at 13:03:22
First of all is the board in that computer capable of handling the processor? Below is an Intel link with the specs for that CPU. The max. draw is 95w. Most of that would be pulled from the 12V rail so that equates to (95w/ 12v = 7.92A@12v). Check the 12V rail rating of your current PSU.

Are you using integrated graphics? If not, why are you bothering with a small form factor case and trying to juice it like that?

Are you sure you actual have an mATX PSU? There are several small form factor types.

Your current PSU should be labeled with the type.

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March 23, 2012 at 17:04:16
Hi again, it's definitely an matx psu. I bought it a a replacement so I'm sure. Current CPU is an i3 530 on a Packard bell motherboard. New motherboard is a S1155 Intel Z68 DDR3 mATX. Like the case, didnt see a reason to change it. Will initially be using integrated graphics although will more than likely upgrade to a card or even sli/crossfire setup maybe at some point. have a tv tuner pci card and blu ray drive, that is all. What would your recommendations on wattage be?

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March 24, 2012 at 07:24:48
The graphics cards are where you may need additional power. Without knowing what cards might be in use we can't advise you. I would assume you plan to use top of the line cards or there would be no advantage to SLI over a single powerful card.

If you intend to build a gaming machine out of that rig you should have gone with a larger case that can hold a standard ATX PSU.

Some hight end graphics cards can draw about 20A@12V each. 2 of them are not going to run on any available mATX PSU. Then you will also need to deal with heat. Small cases are more prone to overheating. Poor circulation and undersized rear case fan.

You may want to rethink your entire plan. Also, IMO, SLI/crossfire are a waste. Only advantage is when you are running 2 of the best cards on the market. Otherwise you can do as well with only 1 of the best cards. Double the cost, double the power requirements, twice the heat.

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