High Amperage Single Rail PSU's

[davidhammock200]

Input, Suggestions & Recommendations Wanted!

Updated October 19, 2006

For many reasons a PSU with a single, very powerful +12V rail is often desired.

The new DX10 GPU's would be my main reason!

These reasons can include multi-CPU's, a large number of HDD's, a TEC, etc.

Under the ATX12V 2.xx specs for dual/multi +12V rail PSU's,
the +12V rails are usually limited to 18A, this is often not enough.

Therefore I recommend the following single rail PSU's.

Sparkle 550W (EPS) FSP550-60PLG (+12V@36A)
http://www.sparklepower.com/pdf/FSP550-60PLG.pdf
From $76: http://froogle.google.com/froogle?tiled=1&q=Sparkle+FSP550-60PLG&btnG=Search+Froogle&lmode=online&scoring=p

ENERMAX Whisper II EG465P-VE FMA(24) 460W (+12V@33A)
From $82: http://froogle.google.com/froogle?q=ENERMAX+Whisper+II+EG465P-VE+FMA(24)+460W&btnG=Search&lmode=online&scoring=p

Antec TruePower550W EPS12V (+12V@36A) (Not TruePower II)
http://www.antec.com/us/productDetails.php?ProdID=20551
From $86: http://froogle.google.com/froogle?q=Antec+TRUE550+EPS12V&hl=en&lr=&rls=GGLD,GGLD:2005-08,GGLD:en&lmode=online&scoring=p

ENERMAX EG651P-VE FM(24P) ATX 550W Power Supply (+12V@36A)
Specs: http://www.enermaxusa.com/catalog/product_info.php?products_id=70
From $98: http://froogle.google.com/froogle?sourceid=navclient&rls=HPIC,HPIC:2005-18,HPIC:en&q=ENERMAX+EG651P-VE+FM(24P)+ATX+550W+Power+Supply&lmode=online&scoring=p

OCZ PowerStream 520W (under-rated +12V@33A)
http://www.ocztechnology.com/products/power_management/ocz_powerstream_power_supply
From $110: http://froogle.google.com/froogle?tiled=1&q=OCZ+PowerStream+520W&btnG=Search+Froogle&lmode=online&scoring=p

Silverstone Zeus ST56ZF 560W (+12V@38A)
Specs: http://www.silverstonetek.com/products-56zf.htm
From $109: http://froogle.google.com/froogle?sourceid=navclient&rls=HPIC,HPIC:2005-18,HPIC:en&q=Silverstone+Zeus+ST56ZF+560W&lmode=online&scoring=p

PC P&C Silencer 610 EPS12V (+12V@49A)
$159: http://www.pcpowercooling.com/products/viewproduct.php?show=S61EPS&view=techspecs

PC P&C 510 (under-rated +12V@34A, Peak@38A)
From $189: http://www.pcpowercooling.com/products/power_supplies/high-performance/

PC P&C Silencer 750 EPS12V (+12V@60A)
$199: http://www.pcpowercooling.com/products/viewproduct.php?show=S75EPS&view=techspecs

Zippy PSL-6701P-SATA 700W (+12V@45A)
http://www.zippy.com/P_PRODUCT_DETAIL.asp?pcpw_rfnbr=5&pcp_name=PS2/PS2%2b%20single&pp_rfnbr=1174&pp_code=PSL-6701P&pcp_rfnbr=3&lv_rfnbr=2
From $250: http://froogle.google.com/froogle?q=Zippy+PSL-6701P&btnG=Search&lmode=online&scoring=p

Zippy PSL 6720P 720W (+12V@52A)
Specs: http://www.zippy.com.tw/P_PRODUCT_DETAIL.asp?pcpw_rfnbr=6&pcp_name=PS2/PS2%2b%20single&pp_rfnbr=1356&pp_code=PSL-6720P&pcp_rfnbr=3&lv_rfnbr=2
From $ No Froogle listings as of 10-19-06

Zippy PSL 6800P 800W (+12V@60A)
Specs: http://www.zippy.com.tw/P_PRODUCT_DETAIL.asp?pcpw_rfnbr=6&pcp_name=PS2/PS2%2b%20single&pp_rfnbr=1357&pp_code=PSL-6800P&pcp_rfnbr=3&lv_rfnbr=2
From $ No Froogle listings as of 10-19-06

Zippy PSL 6850P 850W (+12V@60A)
Specs: http://www.zippy.com.tw/P_PRODUCT_DETAIL.asp?pcpw_rfnbr=6&pcp_name=PS2/PS2%2b%20single&pp_rfnbr=1358&pp_code=PSL-6850P&pcp_rfnbr=3&lv_rfnbr=2
From $322: http://froogle.google.com/froogle?sourceid=navclient&rls=HPIC,HPIC:2005-18,HPIC:en&q=Zippy+PSL+6850P&lmode=online&scoring=p

PC P&C Turbo-Cool 1KW-SR (+12V@72A)
$549: http://www.pcpower.com/products/viewproduct.php?show=T1KWSR&view=techspecs

Good Luck,
Dave ;)

Updated October 19, 2006

Input, Suggestions & Recommendations Wanted!

[Skott]

Would these be more suited for single card setups or would they also be okay for SLI/CF setups as well? There is a whole big confusion out there right now because we're seeing more single rail PSU making their appearance again. It looks like some of the PSU manufacturers are going back on Intels reccomended multi rail standards. PC Power&Cooling is one in particular that seems to be ignoring Intel's reccomendations lately.

[davidhammock200]

Nvidia & ATI are causing all of this because of their very high +12V amperage demands on their "next gen" DX10 GPU's.

Nvidia has now shipped final version samples of their November release products &
they will max at 225W & no more than +12V@18A on the one PCIe connector.

But ATI is leading us to believe that their new GPU's will require 300W+ & +12V@20A or more on the PCIe connector(s).

Most multi-rail PSU's comply with the Intel standard of limiting each rail to +12V@18A max,
so there could be some problems coming.

With a big single rail, it just doesn't matter as long as there is enough +12V amperage to go around. ;)

[jonnyGURU]

Keep in mind that there's a number of single 12V rail PSU's out there, particularly from Seasonic, that claim to have three or four 12V rails because they don't want to have to go through reclassifying their product with the UL.

[clsA]

Keep in mind that there's a number of single 12V rail PSU's out there, particularly from Seasonic, that claim to have three or four 12V rails because they don't want to have to go through reclassifying their product with the UL.

Yeah and did'nt the 2 Corsair units fall into that catagory also ?

[Skott]

I have another question. Lets assume for argument sake that the new cards do require +12V@18amps. How well will the PSUs that allow up to 18amps on the +12V rails hold up? If the amps do drop a little wont that affect the video card? I mean even it only drops a little? Ideally if 18amps is required better to find a psu that can do 19amps or better on the rail feeding that video card, yes? Which none of the current multi rail PSUs currently do to my knowledge. Only the single rail PSUs do it. Far as I know. Personally, I always like to have a little more than needed just in case and to avoid problems.

[jonnyGURU]

All of the PSU's Dave has listed does more than 18A on the 12V rail.

And for the record, when a PSU has excess amperage drawn on it, the voltage drops.

[davidhammock200]

Keep in mind that there's a number of single 12V rail PSU's out there, particularly from Seasonic, that claim to have three or four 12V rails because they don't want to have to go through reclassifying their product with the UL.Yes indeed & this new Corsair 620W has become my favorite PSU of all time! ;)

Thanks Jonny!