View Full Version : Silversotne ST85ZF HELP PLZ!
Hey guys theres 4 PCIE connectors on my power supply-12V4 12V4 12V3 12V2-
I only have one 8800GTX card which ones should I connect to it for best performance or it does not matter?
12-20-06, 01:35 PM
either ones should work fine.
12-20-06, 03:22 PM
It shouldn't matter. They are designed to balance the load evenly so they are all virtually the same. Just grab 2 and use them.
12-22-06, 12:05 AM
As everone has done said it does'nt manner which two you use since they all put out the same power.
I dont think it matters. I know the enermax galaxy has 4 and one is a master. Im glad i got rid of that thing, beep beep beep! all day long. I have a silverstone lots of power and silent as a submarine, your going too dig it.:)
12-22-06, 12:36 PM
Actually, it does matter. I wish that you guys with limited knowledge on PSU's would stop spreading misinformation.
You don't want to use both the 12v4's if you don't have to, though you'd probably be okay doing it. But if you're into overclocking and the card ever has to draw more than 18A it won't be able to if both the PCI-E's you're using pull off 12v4(and the Silverstone ST85ZF has two connectors that do this). You're bottlenecking the card to 18A when there is really no need to. Three different 12v rails can be used for graphics; why the heck would you not want to utilize them?
But if you plug in one PCI-E from 12v2 and one from 12v4, like I have mine, the card can pull a full 18A off 12v4 along with ~14-15A on 12v2 (this shares with a few other components), giving you around 33 total amps for your graphics card, which is more overkill than you'll ever need for an overclocked GTX.
So it does matter. I wouldn't plug both 12v4's into the card just because it doesn't make sense to when you can dedicate that entire rail plus use another rail for extra juice.
12-22-06, 01:50 PM
I would think that he would know that PCIe 1 and PCIe 2 should be use first, or it would say on the side of the power supply which ones to hook up to the PCIe connections,But even if it is one 12v line with four wound coils ,they still should put out the same which ever one he uses ,and if it is four independent 12v lines they should all put out the same ,or it would show on the power supply which one hooks up to the PCIe or at least in his manual,But he has a Quad powersupply that has four PCIe connectors,so I think he would be safe which ever two he choices since he just has one 8800GTX card.
12-23-06, 02:03 AM
If by "put out the same," you mean 18 amps, you're right. However, two of those PCI-E connectors share the same rail--12v4. 12v4 has 18A, so if he uses both 12v4 PCI-E connectors, then he only gets 18A.
On the other hand, if he uses one of the PCI-E connectors sitting on a separate rail, he can pull power in addition to the 18A he gets on 12v4. 12v2, 12v3, & 12v4 can all be used for graphics, meaning the ST85ZF has two PCi-E connectors that share 12v4, one that uses 12v2, and one that uses 12v3. 12v2 shares resources with a second processor and your sata connectors. 12v3 runs the motherboard and PCI-E lanes.
The way the 12V rails are distributed are as follows:
12V1: CPU-1. Typically powered through the 4-pin connector of a power supply. On the ST75ZF, power for CPU-1 is provided by the first two 12V wires on the 8-pin EPS+12V connector.
12V2: CPU-2. Typically, dual CPU motherboards that would require each CPU have it's own 12V rail would get it's power from the second two 12V wires on the 8-pin connector. Silverstone also puts the SATA connectors on this rail as well as PCI-e connector #3.
12V3: This rail powers many things. The EPS AUX 6-pin is on this rail, as is all of the Molex connectors (used for hard drives, floppy and optical drives, fans, lights, etc.) and the main ATX connectors (powers fan headers and slot powered cards that require 12V.) PCI-e connector #4 is also on this rail.
12V4: This rail is dedicated for use with PCI-e connector 1 & 2.
It'd be nice if the PSU knew when to dedicate power from different rails, but it doesn't. That's why the PCI-E connectors are labeled. The user is responsible, on multi-rail PSU's, for dedicating power to components properly. If in this case an individual overclocked his graphics card and needed more than 18A (I realize this is unlikely right now, but some do put up some crazy overclocks and it WILL happen), then he'd be screwed if he plugged in both PCI-E connectors on 12v4 since he'd be bottlenecked at 18A. If he reached his bottleneck, the PSU would not know to pull off a different rail. Again, that's why the connectors are labeled in the 1st place.
Ok, to be clear about this. If you have two 8800 GTX's (requires four power connections) and this power supply do you put both of the 12v4 connections on the same card or do you put one on each?
Of course the two reamining connections would be used as well.
This is how I have mine (xmasgrin)
12-26-06, 01:44 AM
^ Hook yours up the same way Lee has his. He has more juice (> 9A) on 12v2 and 12v3 left over to go with a split 12v4 (9A/9A).
12v2 = 12+A
12v4 = 9A(since it's split evenly w/ second card)
Total = 21A>18A
Follow same logic for other card. 12v2 and 12v3 generally have more than 9A left over.
Will do! thanks to everyone!
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