PSU me this spec

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Hey

Looking for some advice to pass on.

My housemate wants to build a new rig. He's looking at something like this:

Q6600 oced
4-8gb ram
sli or an 3870X2 with option to add another later for crossfireX
He wants to raid 0 two 1TB drives and probably add some more later [so say 4-5 total]
Couple of sammy dvd writers from his old rig
Finally his water setup from his old rig

What kind of volts is he looking at for this. I had a look on some PSU sites and they recommended crazy volts for this kind of setup like 1000W+ but I've seen people say they can run the above spec and more on much smaller PSUs. So whats the deal :D what kind of power does he need and any recommendations for an appropriate PSU.

Thanks in advance for any info

Danny
 
Hello martian_aphid,

To give you an idea on what sort of power supply unit you will need to run the system you have just specified: :)

A single ATI Radeon 3870X2 (I have chosen the ATI Radeon HD 3870X2 specifically since it is currently the card that consumes the most power which is on the market today excluding the ATI Radeon HD 2900XT of course but I doubt you are looking at purchasing one of those :p) consumes about 200 watts under load which equates to 17 amps. So, two of the ATI graphics processing units will equate to 34 amps. An Intel Q6600 overclocked to 3.3GHz will consume about 150 watts which equals to 13 amps. Now, if we add the hard drives into the situation rated at one amp each, plus the water cooling and finally some extra amps for the headroom, this system will be pulling around 56 amps of the +12Volt rail.

Taking into account what power requirements is roughly required for your particular system – The Corsair TX 750W ATX2.2 SLI Compliant PSU which is quoted to have 60 amps on the +12Volt rail would be absolutely fine for your system

Just like the rest of the entire Corsair power supply series, the TX 750W unit is nothing but a superb power supply and I think the comment below by the review site Hardware Secrets really sums it up:

Hardware Secrets said:
This unit also has all the basic stuff everyone is looking for nowadays: high efficiency, active PFC, excellent cooling solution, enough power to feed high-end video cards, five-year warranty and the best of all: it can really deliver its rated 750 W at 50º C. Not only that. During our tests we could pull up to 900 W at 45º C. So you will be basically buying a 900 W power supply paying the price of a 750 W one. What is sweeter than that?

Source - Corsair TX750W Power Supply Review.

You may also be interested in reading a couple of other reviews of the Corsair TX750W unit, one by Johnny Guru and the other by Bit-Tech.

The Enermax Infiniti 720W EIN720AWT ATX2.2 Modular SLI Compliant PSU and the Seasonic M12 Modular 700W Silent ATX2.0 Power Supply that Slinwagh has linked to are able to provide 56 amps of the +12Volt rail and I am sure that either of those units would run your system absolutely fine. However, it does leave you with very little headroom. :)
 
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Fire Wizard thanks for that advice and info it was really helpful =D from what I figured out with my limited electrical knowledge you simply use the equation watts = volts x amp. Therefore take the 130w you say for the oced cpu divide it by 12 for the +12v rail and voila, you get the 11amp rating which you can add up with the other devices to find how many amps you system will draw. Then match it to the amps on the PSU

I thought it was something to do with the number of 12v rails or something which decided how many devices you could use but this clears things up, thanks :)
 
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