Silverstone Zeus ST85ZF Connector Source Rails
|24-Pin Motherboard Connector ||+3.3V, +5VDC, +12V3|
|EPS 12V 8-pin Connector ||+12V1, +12V2|
|EPS 12V 6-pin AUX Connector ||+3.3V, +12V3|
|PCI Express 6-pin Connector #1 ||+12V4|
|PCI Express 6-pin Connector #2 ||+12V4|
|PCI Express 6-pin Connector #3 ||+12V2|
|PCI Express 6-pin Connector #4 ||+12V3|
|Molex Connectors 4-pin (x6 HDD) ||+5VDC, +12V3|
|Floppy Connectors 4-pin (x2 FDD) ||+5VDC, +12V3|
|SATA Connectors (x6) ||+3.3V, +5VDC, +12V2|
The Zeus ST85ZF offers a total of four PCI Express 6-pin connectors and a fifth 6-pin connector Silverstone describes as a 12V EPS "AUX" 6-pin. Each PCI Express 6-pin connector is clearly labeled and reading Silverstone’s online manual (.PDF)
will aid you in choosing proper loading among PCIe connectors, especially when running a SLI configuration: With dual NVIDIA Geforce 7950GTX cards, please use the following combination of PCI-E connectors only:
PCI-E 1 & PCI-E 2
PCI-E 1 & PCI-E 3
PCI-E 2 & PCI-E 3
At 850W and a total of 1050W peak I was relieved Silverstone doesn't try to be all things to all people incorporating modular connectors into the mix. As I've stated repeatedly modular connectors introduce resistance at the connection points where oxidation will occur and the introduction of an additional daughter-board PCB from which wiring travels from the main board to this board and voltage is distributed along traces. In the thumbnail below we see all five 6-pin connectors including the 6-pin 12V EPS connector, with +3.3V assigned to pins 1,2 +12V3 assigned to pins 3,6, and GND assigned to pins 4,5.
The 24-pin motherboard connector and 8-pin baseboard (CPU) connector (also includes an 8 to 4-pin baseboard adapter). I find an 8 to 4-pin adapter preferable over a model which attempts "lock" two 4-pin connectors since they can easily dislodge if not held properly when plugging into the CPU power connector. For the uninitiated this can present some problems. Of course with a 8-pin to 4-pin adapter the rails which may be separated are now combined increasing current to the processor, which will benefit those running Intel Presler or Cedar Mill core CPUs.
Thumbnails below exemplify the remainder of the connectors. This includes: 6 x SATA divided among two cables ( three per cable), 6 x Molex divided among three cables, two of which also feature a single floppy connector for a total of 4 x HDD, 2 x FDD and a third cable with 2 x 4-pin Molex (HDD, AUX etc). C
ooling is critical on any power supply, unfortunately the ATX standard uses (abuses) the Power Supply as an additional exhaust point in the case. This has affected the power supply industry for years elevating the temps at which they must perform. Power Supply makers whom do not take this under consideration, do so at their own peril. Silverstone's Zeus ST85ZF features a full mesh front panel where a large volume of air can flow freely into the unit.
Silverstone (Etasis) chose a Sanyo Denki 80mm fan to cool the ST85Zf. Finding the exact part number (9A0812S413) on the Sanyo Denki
site was fruitless since it's been replaced with 9A0812S4021
. This standard model moves 42.2CFM @ 12V for 34dB(A) with an operating range between 6 ~ 13.8V. Sanyo Denki does offer thermally controlled fans, however; this is a standard model, Silverstone chose their own thermistor activated rheostat which allow placement of that device where it does the most good.
The photo in our next section should exemplify the cooling advantages of a dual PCB design. With components divided across two PCBs and then inverted, in theory many more devices are exposed to the airflow. In a standard design larger components nearest the exhaust fan can obstruct airflow and increase noise. Silverstone also chose to place the fan inside the case, which may provide better cooling, but certainly reduces noise.
In all high-current PSU reviews I make note of the power cord's wire gauge supplied by the manufacturer. As we surpass the 1KW touchstone in the PSU world, wire gauge (see Powerstream - AWG chart/calculator
) plays a substantial role. While our ST85ZF is rated at 850W it has a Peak rating just under 1KW. Few reviews bother to mention power cord AWG thickness. This may be due in part to the average house-hold current limit which is usually 15A, although has little to do with the fact a thicker cord will still improve current draw. The problem for the manufacturer is, as usual cost, with 12AWG or 14AWG wire costing over twice as much as 18AWG. Silverstone includes a 16AWG power cord, a choice which keeps cost low and performance high (below).
Onto the internal layout -->