Guide for Selecting a Power Supply

[Big_Dave]

Hi,

You have a UK based slimline.  It's best to call HP in the UK and get the power supply. 

I could recommend a supplier in the US if you desire that information.  This US supplier has what you need.  I don't know what the shipping charges would be.

Oh, see your other post for a possible UK supplier.

[bored01]

Hi,

I'm trying to upgrade the GFX card in a Pavilion model m9788sc from 2009. (Truckee MB)

This will require a new PSU, but on fitting a 850W watt OCZ PSU, the CPU fan spins for a second or so, then it all shuts down. Everything works normally if I go back to the original 460W PSU.

Note, that this stage, I haven't fitted the new card (GTX590....Yes, I know there will be a heat issue!), and the original OEM GT230 is still in place.

I suspect that maybe there is not enough load on the PSU, and it may be OK if I install the GFX at the same time, but could there be another reason?

[Big_Dave]

Hi,

You better do some measuring to make sure that the NVIDIA 590 will even fit.

I have seen a few posts out here where the bigger PSUs didn't work.  You might consider a Corsair 750w model as that was the last size that I heard will work.

[bored01]

Thanks Big_Dave.

The card will fit, but I'll probably remove the 'media drive' bays (whatever they are) to improve airflow.

But anyway, I gather a standard ATX PSU 'should' work. I was concerned that HP may have some proprietry system.

[tarpon31]

Use caution with installing the 750 watt corsair I had purchased the corsair tx750 v2 for my hp 490t to give adequate power to my new gtx 580 and it did not work when you would turn it on it would power for a second then cut right off I had to return the corsair tx750 v2 as it would not work with my hp 490t after calling hp technical support I was informed to use a power supply no bigger than 600 watts (after contacting multiple hp employees with only one giving me an answer).

As of right now I have the corsair cx600 on order and I will follow up wether it worked or not. I sure hope this works as it has been a pain trying to add on to this computer and very expensive.

Good luck to you guys and thankyou Big_Dave for all your helpfull posts on this forum.

Forgot to mention I tried two tx750 v2 power supplies so it was not a power supply issue.

[Big_Dave]

Tarpon,

You might be right with too big of a power supply. However, the 600 watt limitation indicated by HP support is probably NOT correct.  I am using a Corsair HX 650 in my e9280t and it has the same motherboard as the HPE-490t and the bios was initially the same.  The HX 650 has enough amperage of the +12 volt bus for the NVIDIA 590 but it's 650 watt rating is a bit short of the 700 watt specification indicated by some manufacturers.  The HX 650 would probably work but it will not offer a lot for any future growth.

[tarpon31]

Yes the issue of future growth is a concern for me. I was wanting to make the 750 watt corsair work in this computer incase I ever upgrade again but as it stands I am keeping my fingers crossed that this 600 watt corsair psu will work as it is getting annoying sending back psu's to newegg and paying the $15 restocking fee.

As much as I like the HP 490t if I could have done it over again I would have bought the parts and assembled the computer myself. I was ignorant and a little intimdated to build a computer myself but realized after it was to late it realy is not that hard to accomplish I had no idea that the motherboard on this computer is so locked I may put back in the stock psu/gtx 460 that came with the unit and just save up for another build and take it slowly.

I am in no way trying to discredit hp desktops I think they are realy nice especialy if you can get a good deal on one and you are happy with it's initial specs but upgrading them is kind of limited IMO.

After looking at your model Corsair 650 watt I wish I went that route as it looks like a higher quality unit plus it would ahve given me a little bit of head room for the gtx 580. Thankyou for the reply I appreciate how much you contribute on this forum.

[tarpon31]

Just wanted to update my last post and let you all know that the Corsair cx600 is compatible with the HP HPE 490t it is doing a great job running  this machine. I will let you all know if I experience any issues. For all of you upgrading power supplies on your HP desktops try to keep the overall wattage under 650 watts to avoid problems.

[Big_Dave]

Hi tarpon31,

Thanks for getting back to us.  I don't like the restocking fees either.:smileymad:

[egkor]

I just installed a Corsair GS700 power supply into my HP p6710f desktop, replacing the stock Bestec 250w P.S.

So far so good, runs nicely, quiet.

Next (later today) I will be installing a GeForce GTS 450 1GB PCI-X video card (the reason I installed the new power supply).

-Gary K