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Ultra high capacity PSU

post #1 of 21
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Quote:
Power has become a problem lately with the release of power-hungry graphics solutions. The X1900 XT and X1900XTX in Crossfire in particular have proven to use a great amount of draw, so much that not all power supplies are stable with such a powerful setup. Keeping stable voltages on all rails seems one big concern when it comes to feeding these systems, but we have been experimenting with this and have found that even high capacity 550W PSUs with excellent stability and amperage are also susceptible to X1900 family Crossfire issues. This is where the FSP Epsilon FX700-GLN PSU comes into play.
http://neoseeker.com/Articles/Hardwa...ews/FX700-GLN/
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post #2 of 21
Hence that there is only one 550W PSU (Antec NoeHE) certified for Crossfire use with 1900 series, and that one has 3 18A 12V rails with a total power of 42A on those rails. But nice find
    
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post #3 of 21
I wonder how that PCP&C 1KW would do.
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post #4 of 21
That one? Dual Operon/Quad Crossfire with X1900XTX's, a raid 5 array or so... that's just an appetizer for it. 66A on triple 12V rails is more than just impressive. Note that one of the rails is 36A (!) alone.
    
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post #5 of 21
Quote:
Originally Posted by Chozart
Hence that there is only one 550W PSU (Antec NoeHE) certified for Crossfire use with 1900 series, and that one has 3 18A 12V rails with a total power of 42A on those rails. But nice find
Are you kidding?

three 12v rail @ 18amps a peice vs. four 12v rails @ 15amp a peice.

The FX700 is one of the best high output mid-range price PSU's made to date but that neo isn't bad for the price.
post #6 of 21
My post was not meant to compare the Antec NeoHE with the FSP. Sorry if it seemed like that. I just was confirming the fact that ~550W PSUs are not up to the task by stating that the Antec NeoHE is the only one in that power range to be Crossfire Certified, and that the reason is because it has exceptionally powerful 12V rails for a 550W PSU.

However, to make a fair comparison of the 12V rails, we also need to take the TOTAL available power on those 12V rail. The FSP can deliver 680W on the 3.3V, 5V, and all 12V rails. The 3.3V and 5V rails take up to 155W. Thus, in the most extreme situations, between 525W and 680W is available for the 12V rails. This translates into 43.75A and 56.67A for the combined 12V rails. The real available power likely is around 50A (depending on the draw on the 3.3V and 5V rails).

The story of the Antec is slightly different: Here, there is 504W available for the 12V rails, thus 42A. However, this can decrease when there are heavy loads on the 3.3V and 5V rails (remember, the PSU is only 550W). With a full load on the 3.3V (79.2W) and the 5V rail (100W), there is only 30.9A available for the 12V rails. Thus, I admit my information in the previous post was incomplete. A full load on the 3.3V and 12V rails will rarely occur, normally those loads are fairly light, and for all practical purposes the actual available power will be close to the posted 504W (42A).

Obviously, the FSP is the more powerful PSU.
    
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post #7 of 21
what about the 1kw psu's pulling almost 70A 12v rail....still a good find though
    
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post #8 of 21
The 1,000W PC Power & Cooling has three 12V rails, 16A, 16A, and 36A, for a combined power of 66A (PC P&C website). It's a monster, but more than twice as expensive than any other PSU discussed here. Nothing beats this thing.

The FSP puts out a good amount of power at far less than half the price. It's a good choice: reliable brand, plenty power. I just wished it had 3 rails (something like 18A, 18A, 24A), since I am not particularly charmed with the 15A rails (it is feasible a X1900XTX can draw more than 15A).
    
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post #9 of 21
yeh silverstone sell a 600w 54A 12v 100% modular and sleeved for about 199 AUS which is darn cheap for me considering how much i bought my ocz powerstream for
    
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post #10 of 21
Be careful with buying that PSU: there are TWO models on the market, and you'll not want the one with the weird 12V rail distribution: +12V1@13A, +12V2@18A, +12V3@16A, +12V4@8A. The total output is max. 42A and not 54A (you can't add them up, there is a limit on the total output on the 12V rails). The 42A number comes from the manual of this PSU, which can be found on Silverstone's website.

See also http://www.silverstonetek.com/Q&A%20POWER.htm from which I quote:

Quote:
The original version of ST65ZF is capable powering a fully loaded SLI/CrossFire system equipped with either 7800GTX 256MB or X850XT 256MB. This version of power supply can be identified by the surface coating, which have ¡§shinny¡¨ galvanized coating.

Newly revised ST65ZF(released in summer 2005)and all ST60F are capable of supporting fully loaded SLI/CrossFire systems running 7800GTX 512MB or X1900XTX cards if 4pin to 6pin PCI-E adapter is used on one of the cards. These can be easily identified from the original ST65ZF by its surface coating, they have a flat, black paint finish as opposed to galvanized coating.
The one on Newegg seems to be the original version... Just so you know
    
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