Winmate DD-24AX DC-DC Module for Silent, Efficient Power
Posted: Mon Oct 26, 2009 12:18 am
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That is very clever, Mr. Chin! But you can hardly expect us to figure all this out by ourselves!!Since the FSP adapter is claimed to be 86% efficient and the Winmate board is claimed to be 88% efficient, the combined claimed efficiency of the two together amounts to 75%. Since the test results show better efficiency than this for most of the operating range, the claim of the Winmate board is essentially verified.
I reread your post, decided my comment was an overreaction, and changed it when your post came in at the same time. No offence taken.reddyuday wrote:Oops! Sorry, I didn't mean no offence! I was truly confused about what was measured in the efficiency test.
That's a good clarification and I've borrowed it to use in that discussion about efficiency, hope you don't mind!Now that you made me think it through, here is what I can say:
Since the FSP adapter is claimed to be 86% efficient and the Winmate board is claimed to be 88% efficient, the combined claimed efficiency of the two together amounts to 75%. Since the test results show better efficiency than this for most of the operating range, the claim of the Winmate board is essentially verified.
I am honored! (By the way, I did some time travel myself and unapologized for the offence that wasn't taken )MikeC wrote: That's a good clarification and I've borrowed it to use in that discussion about efficiency, hope you don't mind!
Impressive. SPCR news travels fast!BTW, someone from Winmate just contacted me about the article.
At least on my computer all USB connectors are powered by the 5Vsb, so that has no impact on the power available on any other line.- if many USB devices are connected, for example, pulling on the 5V line — there will be less current available for the CPU or GPU, the big current demanders on the 12V line.
corrected.Olle P wrote:I think there's also a mistake on page 1 (bottom]:At least on my computer all USB connectors are powered by the 5Vsb, so that has no impact on the power available on any other line.- if many USB devices are connected, for example, pulling on the 5V line — there will be less current available for the CPU or GPU, the big current demanders on the 12V line.
Cheers
Olle
EFFICIENCY UPDATE - Oct 28/09
After some experimentation with the SPCR power supply test system, a way to measure the energy efficiency of the power adapters was established. This methodology has to be refined, but the preliminary results look accurate. The FSP120-AAB adapter was found to have about 86~89% efficiency. This suggests that the Winmate DD-24AX V220-2 has a much higher efficiency than 88%. At the high point of the curve, it appears to be at least 93% efficient, and the 88% figure can be regarded as a worst case.
More on all this to come later, as a method of directly measuring the efficiency of the Winmate DC/DC adapter is being devised.
On my computer USB ports are supplied from 5V line when computer is ruining and at suspend hibernate and power down USB will use the 5Vsb.Olle P wrote:At least on my computer all USB connectors are powered by the 5Vsb, so that has no impact on the power available on any other line.
I think it quite possibly is. Some boards switch, some only use one or the other, some have a jumper to select which to use. It's pot luck which you end up with (unfortunately).electrodacus wrote:On my computer USB ports are supplied from 5V line when computer is ruining and at suspend hibernate and power down USB will use the 5Vsb.Olle P wrote:At least on my computer all USB connectors are powered by the 5Vsb, so that has no impact on the power available on any other line.
I do not think on your computer is different.
Hi, I was thinking if you have a board that doesn’t have USB power on 5vsb it can’t wake with USB mouse/keyboard. Maybe could use a USB back plate adapter routed to motherboard header and then remove the USB power (only) from the motherboard header and the connect directly to the 5vsb on the PSU. Could/would this work, anyone any idea?I think it quite possibly is. Some boards switch, some only use one or the other, some have a jumper to select which to use. It's pot luck which you end up with (unfortunately).
I think SebRad is wrong I think is a standard that as long as the PC is ON will use the 5V for USB and when power OFF the USB will use the 5Vsb all modern computer can power from USB . Usually even for big ATX power supply you do not have more than 2A available on 5Vsb so you can not use this to supply the USB when computer is running using only two external USB devices and you run out of power if you use the 5Vsb this is used only when computer is powered OFF (or better standby).SebRad wrote:Hi, I was thinking if you have a board that doesn’t have USB power on 5vsb it can’t wake with USB mouse/keyboard. Maybe could use a USB back plate adapter routed to motherboard header and then remove the USB power (only) from the motherboard header and the connect directly to the 5vsb on the PSU. Could/would this work, anyone any idea?I think it quite possibly is. Some boards switch, some only use one or the other, some have a jumper to select which to use. It's pot luck which you end up with (unfortunately).
Regards, Seb
That looks like a reasonable option, and cheap.Avalanche wrote:Has anyone tried a power supply for an Xbox 360? They seem to put out 12V DC up to 200 W: Amazon.com Link. The price seems good, but there might be a trick or two to getting it to work just right. I know there's a couple of models of them, due to the various Xbox models Microsoft has released.
The price is OK but it seems this AC adapter is using a fan for cooling so it will not be silent also in this photo of the label the input current is 5A at 100V this will be 500W for a 203W output so is probably not power efficient. I fond this Link someone is trying to use this with a PicoPSU.Avalanche wrote:Has anyone tried a power supply for an Xbox 360? They seem to put out 12V DC up to 200 W: Amazon.com Link. The price seems good, but there might be a trick or two to getting it to work just right. I know there's a couple of models of them, due to the various Xbox models Microsoft has released.
Would it not be possible to measure the efficiency of both stages by measuring the DC current and voltage out from the AC/DC adaptor (or into the DC/DC converter)?MikeC wrote:An update posted in the article:
EFFICIENCY UPDATE - Oct 28/09
After some experimentation with the SPCR power supply test system, a way to measure the energy efficiency of the power adapters was established. This methodology has to be refined, but the preliminary results look accurate. The FSP120-AAB adapter was found to have about 86~89% efficiency. This suggests that the Winmate DD-24AX V220-2 has a much higher efficiency than 88%. At the high point of the curve, it appears to be at least 93% efficient, and the 88% figure can be regarded as a worst case.
More on all this to come later, as a method of directly measuring the efficiency of the Winmate DC/DC adapter is being devised.
Ah, drat. I read the article and then commented a few days later. So much for my brilliant idea.electrodacus wrote:PS: This Xbox AC adapter will not work with DD-24AX this require min 18V input so it is not making to much sense to post here.
Not really a good idea with a 130W DC/DC module. Startup peaks on 3.5" drives reach >20W. With 3-4 drives, even if it's brief and not exceeding the max power of either adapter or AD module, it's still a lot of wear and tear over time. I'd venture to say, tho, that this DC module will handle 4 modest power desktop drives w/ an energy efficient CPU/board. I overloaded it a bunch of times and it never complained.Steve_Y wrote:That's fine for a minimalist build, but are there any options for someone who'd want to run 3 or 4 drives in their PC?
Contact Electrodacus, he is a member on this forum, he sells themlargon wrote:Am I stupid or can't one get one of these outside Canada, let alone Europe? Ebay page has shipping in Canada only.
Shipping to: Canada, Europe, United States, Taiwan, Australia, Japanlargon wrote:Am I stupid or can't one get one of these outside Canada, let alone Europe? Ebay page has shipping in Canada only.
I sell world wide if you look at the end of eBay listing you will see the shipping for some country.largon wrote:Am I stupid or can't one get one of these outside Canada, let alone Europe? Ebay page has shipping in Canada only.
41W idle is great for your system (you can not get much less with an Atom board and Atom is 3 to 4x less powerful) I get about 32W idle with a similar system I just use G31 < G45 same amount of RAM undervolted and undercloked Q8400S 32GB-SSD no wireless and DVD is most of the time disconnected.hmsrolst wrote:I purchased the DC-DC converter with a Gateway brick from Electrodacus and just tried it out with a system I'm setting up. The system is pretty basic: MSI G45M Digital, E3200, 4GB RAM, Intel X25-M, SMC PCI-N and a DVD burner.
For a PSU, I was using an old Seasonic 300W Super Toronado which is not very efficient by current standards. The system idled at 51W. With the DC-DC converter and Gateway brick, the system idles at 41W. That seems to me to be pretty low for an MATX desktop setup.
I recommend the Winmate.
I noticed from your ad that you were getting low 30's. I assumed undervolting was producing most of the difference from mine. Do you think G31 draws much less than G45? Have you measured it, or seen it measured? I ask because I have a spare G31 board, and in this system I don't need the graphics advantage of G45.electrodacus wrote:41W idle is great for your system (you can not get much less with an Atom board and Atom is 3 to 4x less powerful) I get about 32W idle with a similar system I just use G31 < G45 same amount of RAM undervolted and undercloked Q8400S 32GB-SSD no wireless and DVD is most of the time disconnected.
Intel thinks sohmsrolst wrote:Do you think G31 draws much less than G45?