Seventeam is slowly entering the US market and ST-750P-AF is one of the few products from them available around here. Is it a good product? Can it deliver its labeled power? Check it out.
Seventeam P-AF and Z-AF series are internally identical, with the difference being the presence of a modular cabling system on Z-AF. So while we tested ST-750P-AF, the results are also valid for ST-750Z-AF. Both models are 80 Plus Bronze certified, meaning a minimum efficiency of 82% under light (20% i.e., 150 W) and full loads (750 W), and minimum efficiency of 85% while delivering half of the labeled wattage (i.e., 375 W). Seventeam also advertises this power supply as having Japanese capacitors inside, while we discovered that this isn’t entirely true (more on this later).
New models from SilverStone Element series (ST65EF, ST75EF and ST85EF) are in fact Seventeam P-AF power supplies. So numbers from this test can also be used for evaluating SilverStone Element ST75EF. It is very important to notice that other models from this series are manufactured by FSP and not by Seventeam.
Seventeam trademark is the sticker in Engrish saying “Breakage Invalid” instead of “Warranty Void if Broken.” By the way, we’ve just got this e-mail from Seventeam: "Since you and other media have mentioned several times about the seal label "Breakage Invalid", we will change it to "Warranty void if Broken" in the near future, after our old Breakage Invalid stock is cleared out.". Isn’t it great when manufacturers actually do something when you point out that there is something wrong?
ST-750P-AF is a small 750 W unit, being 6 ½” (16.5 cm) deep, using a 135 mm fan (which actually measures 130-mm) on its bottom and featuring active PFC, of course.
Only the main motherboard cable is protected by a nylon sleeving, which doesn’t come from inside the power supply housing. Cables are somewhat long, measuring 19 11/16” (50 cm) between the housing and the first connector on the cable, and 5 ½” (140 mm) between connectors on cables with more than one connector. All wires are 18 AWG, which is the correct gauge to be used.
The cables included are:
- Main motherboard cable with a 24-pin connector (no 20-pin option).
- One cable with one EPS12V connector and one ATX12V connector.
- Two auxiliary power cables for video cards with one six/eight-pin video card auxiliary power connector each (the unit we reviewed had four cables, but it was a "special edition", differing from the product found on the market).
- Two SATA power cables with three SATA power connectors each.
- One peripheral power cable with three standard peripheral power plugs and one floppy disk drive power connector (the unit we reviewed had two cables, but it was a "special edition", differing from the product found on the market).
With only two power connectors for video cards this power supply does not offer direct support for SLI or CrossFire using two high-end video cards, since each one requires two connectors each.
Now let’s take an in-depth look inside this power supply.
- 1. Introduction
- 2. A Look Inside The ST-750P-AF
- 3. Transient Filtering Stage
- 4. Primary Analysis
- 5. Secondary Analysis
- 6. Power Distribution
- 7. Load Tests
- 8. Overload Tests
- 9. Main Specifications
- 10. Conclusions