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post #1 of 100
Thread Starter 
I am in the process of upgrading my system, and I would like to have excellent OC capability for both a conroe processor and 2 x1900xtx graphics cards in crossfire mode simultaneously. I have been told that I need a lot of amps on the 12V rails to do this, and a stable power supply. I have looked through everything, and this is the best option that I have come up with:
http://www.newegg.com/Product/Produc...82E16817189011

I would like to know what you all think of it, and if you have any better suggestions. I just want to make sure that 18A per 12V rail is enough to meet my overclocking needs, and if anyone knows anything about XCLIO, as I have never heard of them.

Bare in mind, I also need a 20+4 pin power supply so that I can support my current crappy motherboard as well as a new 24 pin motherboard. I would also like to have modular cabling support.
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post #2 of 100
I've never heard of the brand before but the spec's look great.
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post #3 of 100
Quote:
Originally Posted by stargate125645
I am in the process of upgrading my system, and I would like to have excellent OC capability for both a conroe processor and 2 x1900xtx graphics cards in crossfire mode simultaneously. I have been told that I need a lot of amps on the 12V rails to do this, and a stable power supply. I have looked through everything, and this is the best option that I have come up with:
http://www.newegg.com/Product/Produc...82E16817189011

I would like to know what you all think of it, and if you have any better suggestions. I just want to make sure that 18A per 12V rail is enough to meet my overclocking needs, and if anyone knows anything about XCLIO, as I have never heard of them.

Bare in mind, I also need a 20+4 pin power supply so that I can support my current crappy motherboard as well as a new 24 pin motherboard.
I've never heard of them either, so I don't trust them, no matter how good it is on paper.

Try this:
http://www.newegg.com/Product/Produc...82E16817151025

or this:
http://www.newegg.com/Product/Produc...82E16817703001

PC Power and Cooling or Seasonic are th best brands for extreme high end.
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post #4 of 100
Thread Starter 
I would prefer modular cabling support as well...

If I go lower than the one you suggested, what about the Enermax Liberty, rated high by Tom's Hardware:
http://www.newegg.com/product/produc...82E16817194004
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post #5 of 100
acutally the FSP group i have in my other rig the fx600 is great in reviews it put it above the seasonic and i love this thing

http://www.newegg.com/Product/Produc...82E16817104014
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post #6 of 100
I tried to get information about the TOTAL Amperes on the 12V rails, and I was not able to find that data. You cannot add up the rails. The fact I could not find that number right away makes me suspicious.

Also, those X1900XTX are power monsters. Check the ATI website for certified Crossfire PSUs, although that list seems incomplete.

The seasonic is listed for dual 1800 series, but not for dual 1900 series. 2x18A might not be enough (total 36A, one of the few PSU's that this is a match, indicating the 12V rails are truly independent, as opposed to most others where they draw from one transformer). The PC P&C has one single rail (34A), which is actually a GOOD idea!! (working on a FAQ for that... although Intel's ATX12V stipulates dual 12V, Intel no longer strictly holds to that standard). A good, solidly build single rail with high amps is a very good choice.

Personally, with this kind of money available for a rig, I would go for the bomb-proof, backbreakingly heavy, bank account empying, rock solid, it will last forever, how the heck will I get that thing ever in my case PC Power & Cooling Turbo-Cool 1KW EPS12V 1000W Power Supply - Retail
http://www.newegg.com/Product/Produc...Subcategory=58

This thing has just insane power, at a cost to match. I know, extremely expensive, but... if you drop this money on dual X1900XTX's, you should make them happy with enough power (16A, 36A, 16A on the 12V rails for a total of 66A)
    
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post #7 of 100
Thread Starter 
OK, so so far we have these:
XClio - http://www.newegg.com/product/produc...82E16817189011
FSP Group - http://www.newegg.com/product/produc...82E16817104015
SeaSonic - http://www.newegg.com/product/produc...82E16817151025

Please keep in mind my initial requirements as you make suggestions.

Edit: Chozart, didn't you just contradict yourself in your post by saying you can't add the rails, and then you added the rails? I'm confused... The FSP Group power supply I posted is listed as crossfire certified for the x1900 series.
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post #8 of 100
Sorry.. here's the link for the certified stuff on ATI's website

http://www.ati.com/technology/crossf...crossfire.html
    
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post #9 of 100
Thread Starter 
The FSP Group PSU has 15A each on 4 rails, meaning 60A total. The XClio PSU has 18A per for 72A total.
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post #10 of 100
Quote:
Originally Posted by stargate125645
Edit: Chozart, didn't you just contradict yourself in your post by saying you can't add the rails, and then you added the rails? I'm confused... The FSP Group power supply I posted is listed as crossfire certified for the x1900 series.
Sorry, I should have expanded:

Most Dual Rail PSU's draw power from one transformer, and are then split. The transformer has a limited output of Amps. Example, the Antec TPII has dual rails of 19A each, but a maximum load of 19A (see http://www.newegg.com/Product/Produc...82E16817103931 and take a look at the image of the sticker on the PSU). The Enermax Liberty 550W has dual rails of 22A each, but a maximum load of 32A (see http://www.newegg.com/Product/Produc...82E16817194003 and take a look at the image of the sticker on the PSU)

In the case of the Seasonic, the total output of the dual 12V rails is 36A (2x18A see sticker image). That's why I made the comment that I think that thus PSU is truly dual rails, as opposed to the others, because it's rare to see the Amps add up, as the examples above show.

According to the sticker image on newegg, the FSP group one has 4 rails of 15A each. It is likely that one single X1900XTX will draw more power than that.

Modular not the best idea for high end. You loose efficiency through the connectors.
    
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