Cool Power Gamer 775W

[370forlife]

Oooo we gots us a bruiser here coming in at 775W. Here's a brand I've never heard of. Apparently they are from geeks.com. This is the power supply I mentioned earlier in this thread. Its only been used for a few weeks but I didn't trust it to power a GTX460 with a Phenom II X4 that my friend had built up. I gave him a superflower 80plus bronze sample I had laying around doing nothing. The unit looks good on the outside. I like the finish. And it's modular, with fully sleeved cables!











So here's a fan shot.



Hey, wait a second. Powmax, I remember those guys. They built all those POS's then seemed to just disappear.



Alright, maybe powmax just makes fans now. This looks too nice for a leadman unit. It actually uses two transistor forward, instead of half bridge with two W15NB50's controlled by a UC3844. The protections IC is a LP7510, which simply features OVP on 12v, 5v, and 3.3v and UVP and SCP on 5v and 3.3v. 12v is rectified by 2 30A, 45V schottky diodes in to-220 form. 5v and 3.3v are both rectified by 40A, 45V schottky diodes.



Uhh, what? NCC caps in a leadman. I thought these were fakes but they look soooo real.



Oh crap, that is a leadman part number. Theres a really weird thing about this. I think leadman was either bought by or morphed into this new company called Powsun, and their power supplies are sold as "Powergiga"

http://www.powergiga.com/pcpower_8869.htm

http://www.powergiga.com/pcpower_moduler.htm

Going by the part number on the transformer, I would say this is a 450W.

Interesting, to say the least.

[momaka]

Re: Cool Power Gamer 775W

Uhh, what? NCC caps in a leadman.

That's called a paradox .

I think there was a thread here where someone showed a PowMax with Rubycon caps on the primary (probably in the first PSU Pictorial Thread).

I think leadman was either bought by or morphed into this new company called Powsun, and their power supplies are sold as "Powergiga"

I guess they kept the tradition of using funny names. Already came up with a few different names while I was reading your sentence .

Going by the part number on the transformer, I would say this is a 450W.

Yup, this unit does not give me confidence either. In fact, as soon as I saw the pic of the label of this PSU, I knew what we would be dealing with.

By the way, how's the 5vsb derived? Still 2-transistor self-oscillating stuff? Also, the protection circuits are still way too basic. Every more decent PSU nowadays has at least OPP.

Are you going to do any torture tests on it? Will this unit deliver Pow to the Max?

[c_hegge]

Re: Cool Power Gamer 775W

@370forlife, do you have a PSU load tester?

[370forlife]

Re: Cool Power Gamer 775W

That's called a paradox .

I think there was a thread here where someone showed a PowMax with Rubycon caps on the primary (probably in the first PSU Pictorial Thread).


I guess they kept the tradition of using funny names. Already came up with a few different names while I was reading your sentence .


Yup, this unit does not give me confidence either. In fact, as soon as I saw the pic of the label of this PSU, I knew what we would be dealing with.

By the way, how's the 5vsb derived? Still 2-transistor self-oscillating stuff? Also, the protection circuits are still way too basic. Every more decent PSU nowadays has at least OPP.

Are you going to do any torture tests on it? Will this unit deliver Pow to the Max?

It still uses the two transistor 5vsb circuit.

This is actually a copy of the KK power KK-9966 design I posted a long time ago. IIRC, that would actually do 680W. Now, that KK-9966 unit had a DM311 circuit for the 5vsb, but I have a little bit older KK-9966 that is a 500W unit that does have a 5vsb circuit.

@370forlife, do you have a PSU load tester?

I am seriously thinking of building one.

[killgoth2445]

Re: Cool Power Gamer 775W

Sorry for Bumping, but I actually have one of these PSU's. I have a gamer series running at 880W, and I am using a Phenom II x4 840, and Crossfire HIS HD 6950 IceQ on a Gigabyte GA-990FXA-UD3 motherboard. It is a great power supply, after I got on that worked :P The first one I got sent blew up. But this one works and has been for about 3 months. And it obviously supplies the peak wattage it is saying cause Crossfire 6950's don't power themselves. I think the only difference between Known brands, and cheap brands, are that cheap brands have alot of duds, but that's what the warranty is for. Also they are not energy efficient at all. However they are extremely cheap and mine (thankfully) works wonders.

[momaka]

Re: Cool Power Gamer 775W

I think the only difference between Known brands, and cheap brands, are that cheap brands have alot of duds, but that's what the warranty is for.

No, not exactly.

Cheap PSUs are not only inefficient, but they usually skimp on parts and have less protections so you never know if your computer will go *when* the PSU blows up (notice I didn't use *IF*). Also, 99% of the time, they use cheap capacitors that *will* go bad eventually (most of them rather quickly). And if the PSU has a cheap fan, forget about the warranty - it will probably last long enough to pass the warranty period but crap out soon afterwards. When that happens, the caps in the PSU will most likely kamikaze pretty quickly, thus letting all sorts of ripple go to the rest of the components in your computer. If that doesn't take out a hard drive or something else, you'll be lucky just to have your computer not boot.

No, I'm not being overly-dramatic here. This stuff does happen, and quite more often with crappy PSUs that with known good brands. I suggest you stick around on badcaps.net and read some of the threads in the PSU forum. You only need to learn just a bit about electronics to see why cheap PSUs should be avoided. Of course, even good PSU brands (ahem*ANTEC*ahem) have been known to use crap caps or have a flawed design.

So overall, it's best to check reviews first, and more importantly look at some internal pictures before you really buy that Giga-majilion-watt PSU.

[370forlife]

Re: Cool Power Gamer 775W

http://www.hardocp.com/article/2011/..._supply_review

HardOCP just did a review on a 700W visiontek that is based on the same unit. As you can see, it performed well...up to about 350W, then went downhill from there. Strange as leadman actually copied this design from KK power but managed to even screw that up, as KK power's will actually do 680W.

[Shocker]

Re: Cool Power Gamer 775W

Uhh, what? NCC caps in a leadman. I thought these were fakes but they look soooo real.

They aren't. The font is wrong and real Chemi-cons don't have "NEGATIVE" or "BLACK" markings. And for the record, real 105°C Chemi-cons are brown, not black.

[Rulycat]

Re: Cool Power Gamer 775W

Better than a usual Leadman POS.

[lti]

Re: Cool Power Gamer 775W

That is an odd PCB color.

Did anyone else notice the two resistors stacked on top of each other?

[Rulycat]

Re: Cool Power Gamer 775W

That is an odd PCB color.

Did anyone else notice the two resistors stacked on top of each other?

Probably a cockup in the factory so they just stacked another on top to make the required resistance.

[Rulycat]

Re: Cool Power Gamer 775W

http://www.powergiga.com/pcpower_8869.htm

The one at the bottom right looks tough (the supposed 600-850w)

[Th3_uN1Qu3]

Re: Cool Power Gamer 775W

But i still see Teapo colors on the secondary...

[ben7]

Re: Cool Power Gamer 775W

Har Har, first of all, the KMG series is only for miniature capacitors, not big snap-in ones. Second, KMG sleeves should be brown. Third, for the KMG series, the temperature label should be on the other side of the capacitor, not next to the negative stripe.



I wonder what the capacitance of those would be, probably like ~470uF

-Ben

[Th3_uN1Qu3]

Re: Cool Power Gamer 775W

I have some 10000u 50v that look similar to those primary caps. I know they're fake because between them even the case size isn't the same (some are a tad shorter than the others ), but their capacity is real.

[tom66]

Re: Cool Power Gamer 775W

Even so, 1000uF is too small for 775W output with no PFC. Maybe 400-500W max before 100Hz ripple starts being a big problem. Antec (not that they should be used as an example) had 1200uF/200V caps on a 500W supply, can't remember which though.

I suppose it's better than the fake 330uF's in a certain series of L&C PSU (which were 220uF, but combined 110uF as they are in series.)

I remember a Samsung 42" CRT RPTV with a massive 820uF 400V primary cap (it had no PFC, it was an ancient beast) and it was rated for some 250W maximum input IIRC.