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Discussion Starter · #1 ·
I've actually been wondering about this for awhile now.

Can a power supply be too STRONG for a motherboard?


Would a 750w power supply work on a very old motherboard? (5+ years old)
 

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I don't know, but it would broke the motherboard. :(
 

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Discussion Starter · #3 ·
The reason I'm asking is also for my own system. My own motherboard is from 2007 (Asrock 4core-dual Sata2) and I plan to upgrade to 850w / maybe 1Kw. (Depends on whether or not the system is capable).

And my old PSU will go in the old system I mentioned above.
 

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In short, no, but there are things to watch. It can't be too strong for it really, per se, but mixing newer and older hardware will always require watching out for something. ATX 2.x+ vs ATX 1.3 is the only problem that comes to mind on this topic. Putting a strong +12V PSU on a Pentium III system it "should easily be able to power" could be bad since modern PSUs emphasize the +12V rail and Pentium III systems utilized the +5V rail more, but that's the only real example of where I could think putting a strong newer PSU on older hardware could be bad, and I doubt that's your case, so I'm going to say no. If it's both an ATX 2.x motherboard and an ATX 2.x PSU (pretty sure the PSU is given the wattage), it will be fine.

In short, no, but there are things to watch. It can't be too strong for it really, per se, but mixing newer and older hardware will always require watching out for something. ATX 2.0+ vs ATX 1.3 is the only problem that comes to mind on this topic. Putting a strong +12V PSU on a Pentium III system it "should easily be able to power" could be bad since modern PSUs emphasize the +12V rail and Pentium III systems utilized the +5V rail more, but that's the only real example of where I could think putting a strong newer PSU on older hardware could be bad, and I doubt that's your case, so I'm going to say no. If it's both an ATX 2.x motherboard and an ATX 2.x PSU (pretty sure the PSU is given the wattage), it will be fine.

Edit: What do you need a 1Kw PSU for? Unless you're planning on getting a very power hungry CPU, maximum amount of RAM modules, four or more hard disks, and a two or three very high end GPU setup, you don't need it. You'd be far better off getting a lower wattage PSU. Wattage does not equal efficiency or quality. Most standard enthusiast systems (a dual or quad core CPU, two or maybe four RAM modules, one or two hard disks, and higher-end [not extreme high end] GPU) don't need more than a good 500W PSU at most (and yes, that takes into account leaving extra room, obviously). I'd even say my 610W PSU is probably a little overkill for me, and I have four RAM modules, and four hard disks.
 

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Discussion Starter · #5 ·
Basically the reason I wanted a bigger PSU like that (doesn't have to be 1Kw, but at least 750~850watts) is to use it for future hardware as well. But from what you just said it seems I won't even need that much. (Which is good because that means more money saved).
 

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A Corsair 850W (or even 750W) will run just about any setup out there i.e. Quad-core CPU, GTX285 Tri-SLI, max. memory modules, 4-6 hard-disks, optical drive, cooling systems/lights with room to spare.
 

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Sometimes the total wattage is a bit misleading. As I've seen 650W PSU's from China that still cannot beat this PSU I got. Although it's combined wattage is very low (310W) it's individual rails are huge. While those china PSU's have indivual rails that have low limits.
 

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Going off of what Lord Zedeck said, using higher wattage PSUs on light loads usually causes the PSU efficiency to drop. Here's an example with relatively newer power supplies, older ones will probably show more deviation.

Of course, if you don't care about the electric bill, disregard what I've said :).
 
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