ePower EP-1200P10-T2

[Pentium4]

Got this thing for $15...the dude said "it won't supply enough juice to the motherboard" What a steal! It gave 5VSB but wouldn't power on. Maybe those leaking CapXon had something to do with it?

Well I recapped it and it fired right up. I'll admit it was pretty hard getting some of the caps out, especially the ones where the negative lead was directly adjacent to that HUGE ground wire, my iron barely had enough oomph to heat it up.

So this thing uses a 25A bridge rectifier with a heatsink, and 1000uF 200V TK caps. How does it use APFC with two 200V caps? Does it act like a voltage doubler?

For the APFC transistors it uses two of these: https://cdn.badcaps-static.com/pdfs/...ebf159ba50.pdf

PFC Diodes: http://datasheetz.com/data/Discrete%...atasheetz.html

Switchers (4 of them): https://cdn.badcaps-static.com/pdfs/...45d354599a.pdf

It's got two of those huge transformers. It actually has six 12V rails! And they share 4 of these rectifiers: https://cdn.badcaps-static.com/pdfs/...3178bc3d3b.pdf

5V and 3.3V use two of these each: https://cdn.badcaps-static.com/pdfs/...6d9e8256e1.pdf

It's also the only 80 Plus approved ePower PSU, which means it can actually do 1,200W http://www.plugloadsolutions.com/80P...x?id=33&type=2

Uses a nice fan too.

[goodpsusearch]

Re: ePower EP-1200P10-T2

WOW!!!

And 16AWG wires!!!

I need dis

[Pentium4]

Re: ePower EP-1200P10-T2

Haha Some are 14AWG too. it shows that Topower knows what they're doing when they try!

[momaka]

Re: ePower EP-1200P10-T2

Nice, nice, nice!

CapXon caps are wonderful, aren't they?
Can't say anything about the built quality, other than very good. The choice of fan is the best thing, though. In my experience, Sanyo Denki is hard to beat in terms of performance.

[stj]

Re: ePower EP-1200P10-T2

too bad about the glue.

[c_hegge]

Re: ePower EP-1200P10-T2

So this thing uses a 25A bridge rectifier with a heatsink, and 1000uF 200V TK caps. How does it use APFC with two 200V caps? Does it act like a voltage doubler?

They would just be in series with each other, which gives double the maximum voltage, but half the capacitance. It would be the same as using one 500uF 400V cap.

The use of four switchers is unusual too. That means that it uses Full Bridge topology.

[Pentium4]

Re: ePower EP-1200P10-T2

Nice, nice, nice!

CapXon caps are wonderful, aren't they?
Can't say anything about the built quality, other than very good. The choice of fan is the best thing, though. In my experience, Sanyo Denki is hard to beat in terms of performance.

CapXon does have their niche
Yeah the Sanyo fan spins beautifully. For the noise it makes, it moves a ton of air. It makes a strange sound at low RPM's though.

Should I be concerned that there are no filtering capacitors on the modular board?

too bad about the glue.

I removed more after the pictures were taken, but couldn't get it all off.

They would just be in series with each other, which gives double the maximum voltage, but half the capacitance. It would be the same as using one 500uF 400V cap.

The use of four switchers is unusual too. That means that it uses Full Bridge topology.

Full Bridge, is this why it has two transformers, literally doubling a half bridge design? Comparative to what the Pentium 4 was to Pentium D and/or Core 2 Duo to Core 2 Quad?

Edit: I wonder if the 5VSB can do the rated 6A? The transformer is decent size. To give a comparison, that brown cap next to the 5VSB transformer in picture #9 is 11mm in height

[retiredcaps]

Re: ePower EP-1200P10-T2

CapXon does have their niche

Most of the PC equipment I use at home is thanks to bad Capxon capacitors tossed/given away by others.

[Pentium4]

Re: ePower EP-1200P10-T2

Most of the PC equipment I use at home is thanks to bad Capxon capacitors tossed/given away by others.

It's a love/hate relationship with CapXon

[c_hegge]

Re: ePower EP-1200P10-T2

Full Bridge, is this why it has two transformers, literally doubling a half bridge design? Comparative to what the Pentium 4 was to Pentium D and/or Core 2 Duo to Core 2 Quad?

I'm pretty sure that one handles the 12V output, while the other handles the 5V and 3.3V outputs. It's done to allow for more independent regulation. There are other Full Bridge PSUs (like the Be Quiet DarkPower Pro 10 850W - http://www.techpowerup.com/reviews/b...10_850W/4.html) that only use one transformer.

[Pentium4]

Re: ePower EP-1200P10-T2

I'm pretty sure that one handles the 12V output, while the other handles the 5V and 3.3V outputs. It's done to allow for more independent regulation. There are other Full Bridge PSUs (like the Be Quiet DarkPower Pro 10 850W - http://www.techpowerup.com/reviews/b...10_850W/4.html) that only use one transformer.

Really? They'd add that huge extra chunk of copper just for ~17% of its rated load? Maybe it does one or two of the 12V rails as well?

Interesting, thanks for the link

[c_hegge]

Re: ePower EP-1200P10-T2

^
Possible, but unusual. You would have to trace out which transformer outputs go to which rectifier(s)

[Behemot]

Re: ePower EP-1200P10-T2

Holly crap, 6 rails? And I've been crazy about 4 on Chieftec

They real rails with OCP physically present?

[goodpsusearch]

Re: ePower EP-1200P10-T2

Can you test its voltage regulation?

[Pentium4]

Re: ePower EP-1200P10-T2

Holly crap, 6 rails? And I've been crazy about 4 on Chieftec

They real rails with OCP physically present?

Yeah, OCP physically present! I scoffed at the label when I first got it, I didn't think it'd actually have 6

Can you test its voltage regulation?

Unfortunately I don't have a load tester

[goodpsusearch]

Re: ePower EP-1200P10-T2

Then, with the most powerful computer you have access to?

[momaka]

Re: ePower EP-1200P10-T2

Yeah the Sanyo fan spins beautifully. For the noise it makes, it moves a ton of air.

Indeed. I have heatsink fans with Nidec and Delta fans, and for the same amount of air, the Sanyo Denki is always more quiet.

Should I be concerned that there are no filtering capacitors on the modular board?

Probably not. The way the PSU is built, I'm sure they didn't cut too many corners (CapXon caps aside).

Full Bridge, is this why it has two transformers, literally doubling a half bridge design?

Very much possible, yes. Depends if the transformers have their primaries in parallel or series. With a full bridge, the primaries on the transformers can see up to 2x the main cap voltage - pretty cool, IMO.

Then, with the most powerful computer you have access to?

A Pentium 4?
In all seriousness, they do have high TDP requirments, especially the Press-hots.

[RJARRRPCGP]

Re: ePower EP-1200P10-T2

Maybe was for a Core 2 Quad?

By the manufacturing period codes, that's in the "65 nm period".

I don't even 100 percent know if there was anything that needed a PSU like that, other than 65 nm Core 2 Quads and the Xeon equivalents.

(Except maybe Pentium Ds)

A single core usually wouldn't need more than a good 400 W PSU.

[Pentium4]

Re: ePower EP-1200P10-T2

Then, with the most powerful computer you have access to?

Yeah I can do that, I have some old beefy GPU's lying around

Indeed. I have heatsink fans with Nidec and Delta fans, and for the same amount of air, the Sanyo Denki is always more quiet.

I've noticed the same. Not surprised that it's more silent than a Delta fan

Probably not. The way the PSU is built, I'm sure they didn't cut too many corners (CapXon caps aside).

Good to know, I'm just used to seeing them on modular boards. So with this design, it must naturally not create much ripple compared to half bridge/forward designs? Because (stock) there were only three 2200uF caps to filter for all the 12V, that seems scarce. I replaced the 2200uF CapXon KM with 3300uF 16V Samxon RS (Courtesy of Behemot!)

Very much possible, yes. Depends if the transformers have their primaries in parallel or series. With a full bridge, the primaries on the transformers can see up to 2x the main cap voltage - pretty cool, IMO.

Interesting, so they'd see something like 750V?

A Pentium 4?
In all seriousness, they do have high TDP requirments, especially the Press-hots.

You're quite right I have a (dear to me) Pentium 4 3.73GHz Extreme Edition system with an OC'd 8800 Ultra. I can plug in more to give it more of a load, even at full load, that would make this PSU yawn!

Maybe was for a Core 2 Quad?

By the manufacturing period codes, that's in the "65 nm period".

I don't even 100 percent know if there was anything that needed a PSU like that, other than 65 nm Core 2 Quads and the Xeon equivalents.

(Except maybe Pentium Ds)

A single core usually wouldn't need more than a good 400 W PSU.

It was manufactured in 2007, so roughly yes. It was probably targeted towards people with big folding farms?

[momaka]

Re: ePower EP-1200P10-T2

Because (stock) there were only three 2200uF caps to filter for all the 12V, that seems scarce.

Wow, maybe there really is less ripple from full-bridge designs.
HiPro puts nearly the same capacitance in their 250W units, which is just 1/4 of the power this PSU supplies.

Interesting, so they'd see something like 750V?

Yeah, something like that.

You're quite right I have a (dear to me) Pentium 4 3.73GHz Extreme Edition system with an OC'd 8800 Ultra.

That should do. 115W TDP to boost, with 81W minimum power consumption in Stop Grant State and almost 150W on full tilt. Gee, what did Intel have in mind when they made this CPU? A rice cooker? Tea pot?
I bet the VRM is real beefy on that motherboard. Probably the heatsink too.