HuntKey Jumper/R90 300W 80Plus Gold
by Martin Kaffei on March 5, 2011 12:00 AM ESTInternals and Components
The first thing to note when looking at the internals are the three very thin and small heatsinks. That might be cause for concern in larger power supplies, but with the high efficiency there shouldn't be a lot of heat lost inside the PSU. The Gold certification requires at least 87% efficiency at 100% load, which would work out to at most 45W of internal heat loss. With the 120mm fan blowing on the components, things should be fine.
Looking at the power circuitry, starting at the input. Four Y- and two X-capacitors, one relay to handle current in-rush, current-compensated and linear chokes, and an MOV are all part of the EMI filtering. After that, HuntKey uses a common 10A bridge rectifier in a KBU housing. The PFC choke has its own plastic case, which is nice to see. Like Seasonic, HuntKey has different ICs for PWM and PFC. There's a CM6901X for switch control, which is physically in the secondary circuit. That's why they need the separate CM6502SX for PFC; most manufacturers combine both functions in one IC.There are two IRFB3206PBF in the secondary for active rectifying. Another interesting detail is the diode in the power factor preregulator. It's a component from QSpeed with one of the lowest reverse recovery charges in the inexpensive price range--usually a problem with CCM.
The main capacitor is a Rubycon USG rated at 85C/2000h and 220 μF. Two MOSFETS from ST Mircoelectronics follow (fully isolated TO-220FP casing), with a resonant topology and very efficient transformers. After rectification HuntKey has two DC-to-DC VRMs for +5V and +3.3V; both use all solid capacitors for filtering. The +12V rails also have plenty of solid capacitors, with a few liquid electrolyte caps as well.
This PSU has OVP on both sides, along with UVP, SCP, OCP, and OPP. It doesn't have OTP, but there's a diode for temperature measurements as part of the fan control. OCP worked fine in testing, tripping at 28A (336W).
There's not a lot of empty space on the PCB, the the PSU uses active cooling and an efficient design so that shouldn't be a problem; the 14cm casing could actually be shorter if HuntKey wanted. On the left is a large plastic piece to protect the PSU from short circuits caused by contact with external objects. Finally, the PCB uses first class material with good soldering. We've never seen this sort of quality in a retail 300W PSU before, so overall the internals are awesome!
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SilthDraeth - Saturday, March 5, 2011 - link
Kind of stinks that they take away the sleeves, and matte black paint for the American version. I guess shrink tubing isn't to costly... But still.SirGCal - Saturday, March 5, 2011 - link
Especially for the very high cost... It's the little things that start to matter at that price. Wraping and a nice finish is part of those things... Bummer too cause I might have considered it otherwise.Mr Perfect - Monday, March 7, 2011 - link
Yes, don't sell yourself short HuntKey. If you have a quality product, put some quality fit and finish on it. The plain looking case and cables makes the US version look cheap.mindless1 - Saturday, March 12, 2011 - link
It's teenagers or young males who think they are still that feel the need to try to impress others with visual interior effects on a PC, and even among those it is a very small # of the market. Most people's cases have a solid side panel w/o window and not only is it totally irrelevant to them whether it is black painted or sleeved, they couldn't even tell you what color their PSU is or whether it is sleeved.Put the PC out of the way and get some art on the wall if looks are important.
JasperJanssen - Monday, March 14, 2011 - link
Well, the colour of a PSU does show out the back of a case, and sleeving has a functional effect, not jsuit a decorative one.HangFire - Wednesday, March 16, 2011 - link
A Gold rated power supply is going to appeal to system builders, modders and aficionado's who take pride in their work."Most people" who use "Most people's cases" with a "solid side panel" will be buying the cheapest P/S available, which won't be this one.
Orville - Saturday, March 5, 2011 - link
Martin,Make it fully modular with a good selection of cable lengths to choose from and I'll pay $100+. Bring on a 200 Watts unit of the same kind and I'll pay the same.
Orville
Martin Kaffei - Saturday, March 5, 2011 - link
Who knows, maybe they will add another version later. I'm sure HuntKey cares about that. Or other manufacturer will.If HuntKey sells a lot of them other brands will follow. I'm looking forward to this situation since 300W Gold with modular cables is more interesting than 500W+ with Platinum.
richardginn - Saturday, March 5, 2011 - link
to really see how much can run on this 300WATT PSU before it becomes worthless.j-g-faustus - Saturday, March 5, 2011 - link
I expect that I can run a moderately overclocked Sandy Bridge 2600K plus a GPU like GeForce GTS 450 (~100 W DC) and still stay below 80% of the 300 W capacity.This is based on my current 2600K@4.1GHz which draws 145 W from the wall with 8 Prime95 threads. Given 80% PSU efficiency this should be ~116 W DC, plus 100 W for a GPU is just 220 W DC total.
Looking forward to this PSU, hoping that we will see more power supplies with low wattage and high efficiency.