Devonavar, don't you think about using MOSFETs instead of high power resistors? They are more stable under load and can be controlled very easy and precisely, without high-current switches -- you can use rotary switch or variable resistor. I can draw you simple schematics if you wish.

the ONLY reason psu makers switched to multiple 12v rails was because some dumbass that was writing the specifications for PSU's decided it was too dangerous to have more than 18a on a single line. Which it isnt. EN-60950 safety requirements: power above 240 VA on user-accessible rails may lead to ...

One misprint in the article, page 3:
"An secondary heatsink provides spot cooling for this transistor"

It is diode bridge rectifier, not transistor.

EsaT wrote:-12V is only one which is available from any modern power supply but even that is propably quite needless

-12V is used for RS232 port drivers (single +5V voltage drivers are more expensive) and sometimes for onboard audio, also it may be used on PCI add-on cards.

I'm not entirely sure about running a 3.2E on it, though. Does anyone know how the 9800pro ranks when it comes to power draw? Less than 50W, shared between 5V, 3.3V and 12V rails. http://www.xbitlabs.com/articles/video/display/ati-powercons_8.html P.S. Get FSP. BlueStorm, Saga or OEM models (FSPxxx...

Add a few DC-DC converters inside the PSU, and you have something which functions the same as a current-gen PSU, but may be more efficient No, it wouldn't. Independent DC-DC converters are not more efficient than group stabilization (used in most of the modern PSUs) or mag-amps (used in PSUs with i...

1) SilverStone Zeus SST-ST75ZF and SST-ST85ZF have one AC-DC converter and two fully independent DC-DC PWM converters (STMicro L6730 PWM controllers with synchronous rectifiers and 400 kHz switching frequency). Their overall efficiency is about 85% -- good, but nothing exceptional. 2) Distributed po...

burebista wrote:On paper it sounds very promising.
I'm waiting for a SPCR review when it will be available.

http://www.silentpcreview.com/article280-page1.html
http://www.silentpcreview.com/article292-page1.html

They all are based on the same design, FSPxxx-60GLN series.

I just wonder might there be two versions of GameXstreams? Theoretically, yes. I asked FSP if there is another version of fan controller specially designed for OCZ or different revisions of FSP700-80GLN (Epsilon), they don't answered yet. Also basing to responses in FSP's support forum in Hexus som...

EsaT wrote:It's identical to Fortron Epsilon and X-Bit labs review stated this from it

Right now we have two OCZs: GameXStream 600W and 700W. And they are much louder than Epsilon that we have tested.

It does matter, like i said, because if its positive for the effect that i want to work, i would have to hook up the 20,000 volts to the chassis Since all high voltage sources are isolated from the ground (for safety reasons) it doesn't matter which voltage you connect to the case, positive or nega...

The reason i want to work with a negative voltage is because if i used a positive voltage, i would need to apply it to the chassis, which would be bad It doesn't matter whenever you connect negative or positive voltage to the ground. There's no any difference. But for safety reasons it would be muc...

Aris wrote:if i used a negative voltage and then the chassis of the case as ground, would ground become my positive because the voltage is negative?

Please explain clearly -- what you want to do?
If you get negative voltage (-12V) from PC's power supply -- yes, you can take ground as opposite (positive).

cass wrote:They typically trip at about a 5-6 milliamp difference in the live and neutral currents

No. Minimum is 10 mA (used in dangerous environments or in specific locations at home, e.g. in the bathroom), than 30 mA (mostly used in live environments) and 100 mA (used in industrial environments only).

However, a properly operating computer will not have any current flowing to the earth (nor will any other properly working electronic device) Not quite right. There will be small currents from AC noise filter (~1mA), there are two Y2-class capacitors between ground and N&L AC lines. They used to fi...

What's it sensitivity like on the low end of the spectrum? ie, Do you think it could give meaningful numbers from 12v DC sources like HDD's or fans? Usually resolution of clamp meters with 300...600A range is 0.1A and absolute error is about 3 to 5 digits (= 0.3...0.5A). So you can't measure low cu...

My P4-3.4 idles at .7A (77watts) and maxes out at 1.4A (154watts)....about right This is wrong unless you have PSU with ActivePFC. Without ActivePFC, TrueRMS clamp meter will give you RMS current and therefore apparent power, not active power. Non-TrueRMS meter will give you some completely meaning...

Oklahoma Wolf wrote:Topower just omitted independant protection for each 12v and is pretty much selling that as a "feature."

Exactly.

burebista wrote: That Nexus is based on FSP Bluestorm (ATX12V v2.x), and I'm pretty sure that that heatsink looks different.

Nexus NX-4000 is based on FSP400-60PFN (ATX12V 1.2), not Bluestorm (FSP400-60THN-P, ATX12V 2.0).

jaganath wrote:Thermaltake is like the opposite of Seasonic; they have a massive marketing budget, and a tiny research and development budget

It seems they don't have research and development at all, only "Label Design Department" :)

Wow, it used to be that PSU's with ~80% efficiency at 150W+ were considered pretty stellar, and now they are the dog's breakfast? How times change.... Recommended efficiency for the ATX12V 2.2 power supply is 75% at light load (20% of full load or 130W for the 650W PSU), 80% at typical load (50%) a...

Devonavar wrote:Filling out some details ... 54% efficient at 40W. 36 dBA@1m at the same level. That tells you everything you need to know.

Hmmm... Just processed my data. Mushkin XP-650 -- 57% efficiency at 51W load, 75% at 150W, 79% at higher loads (up to 630W). You're right, not very impressive

85 USA bucks with a modular cable system and SLI support. Has anyone tried it? Made by Topower, so you can search for Topower tests (OCZ ModStream and PowerStream, Topower itself and so on). BTW, I've tested Mushkin XP-650. Very good voltage stabilization (independent stabilization on +12V, +5V and...

Article with this graph will be published at xbitlabs.com... mmm... may be at the end of august :) Yes, it was constructed by myself :) Actually, OCZ GameXStream made by FSP and almost identical with FSP Epsilon, but Epsilon is much quieter . I asked FSP Group did they change fan speed controller in...

Ambient temperature 22C.

The one I was looking at actually differs from the one pictured and comes with the 20-pin atx extension lead. I was thinking of securing it to two small wooden blocks at each end then just sticking the blocks down onto the case floor You can use ordinary brass standoffs coming with motherboards and...

Jordan wrote:They usually have little screw holes in them anyway so I could probabaly mount it on two small strips of wood

BTW, it would be better if you screw it to the PC's case and connect to the motherboard with the cable like this one.

Not even stand-offs to keep them off a metal surface like Motherboards? In this case -- main ATX connector acts like a stand-off, so usually there is no need in additional fastening. Of course you'll have to make sure that PCB doesn't touch any conducting parts (case, motherboard, unused connectors...

Jordan wrote:Being bare circuit boards though, do they need to be isolated in some way?

No, they don't. There's is no dangerous voltages.

If overheating phantoms are likely to blow up mainbords "After that" doesn't mean "owing to that". I mean, for example, if you case doesn't have enough cooling/ventilation, it may lead to motherboard overheating (e.g., MOSFETs in VRM must be cooled with air flow) AND psu overheating at the same tim...