New Replacement Power Supply for the HP MediaSmart and Data Vault Servers

by Stephen Bruce on February 24, 2012 · 33 comments

in News

I am pleased to announce that OverTek LTD in the UK has a new direct replacement PSU for the HP MediaSmart and Data Vault servers.   Back in July 2010 we first learned about OverTek LTD offering a direct replacement PSU for the HP MediaSmart Server.  Since then I have had the opportunity to actually test one of their PSU’s and have been pleased with its performance.

What makes OverTek special is they modify an existing high quality FLEX ATX PSU to ensure it is wired properly for the HP MediaSmart and Data Vault and then properly terminate the unnecessary wires that are not needed.  What others offer is a PSU which will directly fit but lack the necessary wiring modification needed to make the PSU actually work, requiring the end user to modify the PSU on their own. You can learn more about the MediaSmart power supply in our Wiki.

The new PSU is actually manufactured by Seventeam a manufacturer of PC and IPC PSU’s in Tiawan and Guandong Province China who has been manufacturing PSU’s since 1986.   The new PSU is a 300w FLEX ATX PSU  which is bump up from the typical 200-250w PSU,  so this unit will more than handle anything you throw at it reducing the risk of overloading it and having a premature failure.

The power supply is also quiet. Overtek has provided this PDF document highlights that in the power region HP Mediasmarts tend to operate, up to 100W, forced cooling remains at a minimum which means the noise levels stay very quiet at around 20dBA.

While Overtek LTD does sell other PSU’s on their website you will need to purchase this PSU on eBay for the low cost of $69.99 + Shipping.

Here are the specifications of the PSU:

Manufacturer: Seventeam

Model: ST300-FUB (300W Flex ATX PSU)

General Specs provided by OverTek as listed on eBay:

Output Power:  Max 300W Continuous

PFC:  Active Power Factor Correction

Protection:  OVP, OPP, Short Circuit Protection


Input Voltage:  100 to 264 Vac

Input Frequency: 50-60 Hz

MTBF: 100,000 Hrs Min @ 25c excluding fan

Input Current:  3A @ 115Vac – 1.5A @ 230Vac


Voltage:         +5V    +12V   +3.3V   +5Vsb

Min Current: 0.2A   0.5A    0.1A     0A

Max Current: 16A    18A    14A      2.5A


Operational Temp: +0 to +50C

Storage Temp: -20 to +80C

Operational & Storage Humidity: 5 to 95% non-condensing

Safety Ratings:

  UL1950, CUL, CB


  UL 60950

For those interested in purchasing their own Flex ATX PSU and modifying it to work with their server we do have instructions in the sites Wiki on how to go about doing this.   For those who desire a direct replacement PSU then head over to eBay and purchase one from OverTek LTD.

If you have purchase a PSU from OverTek LTD please feel free to share your experience.

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By day I am a Plant Engineer running a food container manufacturing facility which supplies containers to the Chinese Restaurant Industry. By night I spend my time helping others with their Windows Home Servers, working on various server projects. My other interests are animals, photography, media streaming, cultural history and linguistics. You can find me in the forums as Comp1962


Adam February 25, 2012 at 8:50 pm

This almost makes me want to replace my current PSU in my 470 before it dies. If these great replacement parts keep coming out, I’ll never build a new WHS!

Comp1962 February 27, 2012 at 4:26 pm

The thing about the EX470 is there are many available forsale by those who have outgrown it and need something more robust so finding parts should be an easy task. Even if you were to say purchase a working server the same model series as your current server then all you need to is pop in the drives, connect the external components and turn it on and everything will boot up perfectly for you. While I do have multiple servers I still use EX470′s on and offsite.

Mark February 27, 2012 at 1:03 pm

I bought one for my EX470 and it worked great so ordered another for a spare.

Comp1962 February 27, 2012 at 4:30 pm

I like having a spare PSU available to me onsite. I do not keep every PSU onsite that I use but do keep the ones that are either special, proprietary or hard to find. Those which I can get the same day locally I do not keep on my self.

Gib February 29, 2012 at 6:47 pm

Just wanting to make sure this will work with an EX490.


Overtek Ltd March 2, 2012 at 7:37 am

It’ll work, you can be totally assured of that.

I’ve personally professionally reworked somewhere between 100-200 units to date.

Overtek Ltd

Gib March 2, 2012 at 5:59 pm

I guess next question is can we get these in Australia? I went to the Overtek web site and it says we do not ship to AU.


Overtek Ltd March 3, 2012 at 1:27 am

Listing Error, please give it another try.

Gib March 3, 2012 at 8:29 pm

Thanks Overtek Ltd. Ordered one today. Good to have a spare.


Earl March 5, 2012 at 2:03 pm

Will this work on a ex487? I’m guessing it should be fine. My server died last night and according to HP support it might be the powersupply since it will power off and on by itself.

Overtek Ltd March 5, 2012 at 4:03 pm

Hi Earl, will work well with EX487

Earl March 5, 2012 at 5:54 pm

Thanks I placed an order on ebay. I’m so glad you sell these!

TJCyr March 6, 2012 at 12:44 pm

You can also get replacement power supplies here:

I just ordered one for my EX490. Should have it next Monday.

Comp1962 March 8, 2012 at 2:42 pm

Make Certain you check the PINOUTS on the connector to make certain its wired correctly for your server. Even if its wired properly then your probably going to have to deal with extra connectors your server will never use. Please let us know how you made out with the PSU. One thing about Overtek PSU’s is they have been completely reworked so you can easily replace the PSU without having to deal with the other connectors that again are not used in your server.

Gardian March 6, 2012 at 2:00 pm

I can vouch for Overtek Ltd power supplies, I got one for my EX470, plugged right in and the wiring was short, like it needed to be. THX

The link above looks like a less powered unit for more money. Can’t speak for them.

I should get a spare for my x510 but then I will never build my own :-) Maybe when the drives are full.
Awesome power supply, Thx

TJCyr March 6, 2012 at 4:49 pm

You are right, my choice has not been tried and true in this forum yet.
However, once you include the shipping, I think I got the better deal – $108 vs $114 (for expedited shipping). My server is down so I needed it asap. As far as the 300W vs the 270W is concerned, you only need so much overkill. You have to keep in mind that you are replacing a 200W PSU which has been fairly reliable for most people.

Alex Kuretz March 8, 2012 at 8:53 am

The atxpowersupplies guys were promoting their own products in comments here and so were deleted. Since TJCyr is a legit customer I’m sure many of us will be interested to hear how it goes since Overtek is well known here and the other company is not.

Overtek Ltd March 8, 2012 at 9:34 am

I’m sure it will work just fine providing your able to cram all the other connectors in and it doesn’t impact on airflow/cooling too much. You could always cut the remaining connectors off and cap them, warranty notwithstanding. Or maybe even take them back to PCB if you have the time, soldering equipment and experience. FSP270-60LE is densely packed and is not the easiest to rework.

The power aspect is interesting though, FSP270-60LE can run 300W @ 25°C (part of the manufacturers spec) it then de-rates to 270W for up to 50°C range.

TJCyr March 8, 2012 at 6:24 pm

I’m sorry that I came across as someone trying to promote another vendor, that wasn’t my intent. I was just trying to point out that if you need your PSU in a hurry that there is an alternative. If I was shopping around for a spare PSU I probably would have gone with the OverTek unit. Since my server has been down for almost 2 weeks I couldn’t wait the 2 to 3 weeks to get a new PSU.

Thanks for the advise on the extra cables. Due to the warranty issues I’ll leave them intact for now but if airflow becomes a problem I’ll break out the wire cutters and shrink tubing. Since noise is not an issue for me (I keep the EX490 in the basement) I’m thinking of cranking up the RPM on the fans to around 75% in the BIOS. Do you think this might help?

As far as the wiring is concerned I was assured by atxpowersupplies that it was a direct fit but I will make sure the color codes match up. I would short pins 1 & 2 out to force the PSU on to check the voltages but I read somewhere that this could damage the PSU. The PSU is made by FSP so I assume they use the standard color coded wiring.

If you want more details on how this horror story started out you can read about it here, just look for my postings starting on page 2:

Thanks for all you advise and understanding…

Overtek Ltd March 9, 2012 at 6:17 am

Just a couple of things.

Standard delivery is approx 1-2 weeks with final delivery handled as Registered Post by USPS.

Expedited delivery is guaranteed 2 day delivery to most of USA. In other words if we’ve got your order over the weekend it will ship on Monday and will be with you on Wednesday.

If it helps, we can add a Fedex service which will deliver within 2-5 working days. Giving a total including shipping of $104.99

TJCyr March 24, 2012 at 7:42 pm

Here’s an update to that atxpowersupplies PSU that I purchased several weeks ago. You are absolutely right about all those extra cables restricting the airflow. Most of the extra cables I could have tucked in along side the PSU but they have a 24 pin ATX to 20 pin HP ATX adapter which is huge and impossible to bury anywhere. It is positioned such that it will restrict the airflow to the CPU heat sink. I sent it back for a refund. Unfortunately, they charged me a $20 restocking fee!

Anyway, I made an adapter to test my old PSU with an old ATX motherboard that I had and it seems to work fine (should have done this weeks ago!). I also took an old ATX power supply and made an adapter so I could hook it up to the EX490. The system has been working fine for about a week now with this power supply sitting out on the bench. I have no clue why the EX490 will work with an older ATX supply but not with the PSU that it was designed to work with.

I suspect the problem may be something wrong with the Power OK circuit on the motherboard. Can this circuit be bypassed somehow? Can I just slap a pull up resistor to +5V on that pin?

Alex Kuretz March 24, 2012 at 8:11 pm

Thanks for sharing your feedback on the other power supply.

I wonder if the PSU failure in your MSS is load related? If you just hooked it up to an ATX motherboard with no load, maybe it wasn’t exhibiting the problem?

Unfortunately I don’t know the answer to your last question about the resistor.

Keith March 31, 2012 at 12:54 pm

I came home from vacation last week to find my EX470 completely dead. The unit would not power up. I ordered a new PSU from Overtek on Wednesday with expedited shipping and it arrived yesterday. Installed it this morning and the EX470 is back up and running. And it’s is much quieter as well!

This website and posts like this have been so helpful over the last few years. Thanks to all for the robust community help!

Earl March 31, 2012 at 1:38 pm

The one I ordered installed just fine, but is actually louder than my original stock PSU. Its a quiet fan noise, nothing crazy but I never noticed my old PSU.

Overtek Ltd May 31, 2012 at 5:25 am

Just a quick note, due to high demand we have just ran out of stock of the 300W unit, due back in stock in early July. In the mean time we’ve reverted back to reworking the previous 250W in house for any requirements during June.

Ken Smith June 4, 2012 at 4:38 pm

Just checked ebay and it said the psu was going fo $749! That must by a typo.

Ken Smith June 4, 2012 at 4:40 pm

Here is the link: Say it aint so ;)

Idle Hanz June 5, 2012 at 12:20 am

That makes sense, bet you that price drops down a decimal place in July when there back in stock like they say above your posts and like it says on the second line of the listing in your link.

This must be the 250W replacement their on about as the alternative in June for that one.

Earl June 5, 2012 at 4:24 am

LOL! Well after looking at this this safe to assume a typo… either that or they were bought out by apple ;)

Overtek Ltd August 30, 2012 at 7:23 am
Ziv September 21, 2012 at 9:45 pm

Good and yet sad timing, my EX485 just had to join the non-starter club.
Looking forward to installing the new 300W PSU. Hopefully it will handle my 4 WD Black Caviars.

Overtek Ltd December 4, 2012 at 8:14 am

A quick update.

We’ve been able to reduce the noise levels further by slowing the fan speed a little more whilst maintaining sufficient cooling levels to ensure optimum product life.

All units now shipping feature a reduced noise level signature from the fans. December 28, 2012 at 6:24 am

Just bought the PSU for my Mediasmart EX475 and it works perfectly. My server is up and running again!

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