The most interesting thing that we discovered opening this power supply is that Zalman ZM600-HP and OCZ GameXstream 700 W are internally the same power supply, manufactured by FSP, using exactly the same components.
Both use a 120-mm fan on their bottom, have high-efficiency, have active PFC using three MOSFET transistors (while the usual is using only two) and carry a three-year warranty.
There are some differences, though. OCZ GameXstream 700 W does not provide a modular cabling system, while Zalman ZM600-HP does. Also the model from OCZ has a voltage regulator integrated circuit used as protection on its output, circuit not found on Zalman’s. And Zalman’s unit has a heatsink with heat-pipe on its secondary, while OCZ uses a L-shaped heatsink connected to the power supply housing, using it to dissipate the heat produced by the secondary rectifiers.
While the gauge of all main wires is the same on both power supplies (18 AWG), on OCZ GameXstream the +12 V (yellow) wires on the motherboard cables are 16 AWG, which can explain the higher current capability found on OCZ’s model.
While all components on both power supplies are exactly the same, the main rectifying bridges used on Zalman’s is one step above the ones used on OCZ’s (GBU606 vs. GBU605). While both components are basically the same, the bridges used on Zalman’s can handle a higher voltage.
Why OCZ model is labeled 700 W and Zalman’s is labeled 600 W is still a mystery to us, as they use the same circuit. The difference is on the +12 V outputs, and this difference could be explained by the use of thicker +12 V wires on GameXstream 700 W motherboard connectors.
David Hammock suggested I write a review on this product. I am not an expert in this area and this will just be a "users" opinion and I trust I can do so without any controversy.
Zalman has joined the ranks of Mushkin and Corsair in a growing market of company expansion into products related to their existing customer base. Their PSU offering is made OEM for them by FSP in mainland China. I obtained the PSU through a friend of mine who went to the factory and picked one up for me, I paid about $140.00 US tax inlcuded(I have seen $159.00 on the net). They appeared in the US market this month. The packaging is simple enough and comes with all the modular plugs required for any system and I found that they connected firmly into place. The main power connectors, PCIE express are not modular and 2-4 power cables can be combined to form an12V CPU. Five velcro wire straps are included. I was impressed by the overall quality of the PSU and matte finish of the case. The cooling radiator which can seen from the back is quite an innovation on their part and results in a very quiet PSU, the single fan is almost impossible to hear and the LED accent lighting is above the fan instead of the usual location in the fan construction itself. This provides a low accent light and is not as prominent and the other LED fans FSP places in the other PSU's they make. Notably they did not inlcude a "Ring Core" to prevent electromagnetic pulses leaking from the power supply to appliances that are being attached to the same power source such as an AC wall plug.
From the images attached many of you can appreciate the quality of parts used.
Since I have not mastered the use of a PSU tester at this time my results are based using Everest 3.50, Speed Fan and OCCT. I used my signature rig DFI SLi Expert as test platform. I ran an OCCT "Torture Test" 255FSBx11 1.40V with the 2GB Geil Value Ram 2.8V. During the test I browsed the web, kept Everest open and started a DVD burn file with Nero. The 12V+ rippled .07 or .57% during the 30 minute test. The +5v rippled .02. I experienced no problems at all. For real world testing I played BF2 and Company of Heroes with the same ripple results. No BSOD's or any other problems occurred during use. Overall I fully satisfied with this PSU and Zalman has scored again with a great product. I look forward to when David or JohnnyGuru publish their results on the same unit.
If requested I can link my initial build images.
I assume I followed the forum rules in this post and used the appropriate method to insert the links. Moderators feel free to edit.