Need New PowerSupply Advice Needed

March 22, 2011 at 08:36:15
Specs: Windows Vista
Good day to all,
First of all I really never thought about upgrading the stock powersupply. What made me think about it was helping a buddy purchase his new computer. I started reading spec's and realised most of the units you can buy off the shelf come with 250-300w power supplies. Which is underrated for most up grades.
Here is what I have
Hp M9340F This unit case with a 350w power supply stock. (

I upgraded to
8gig ram ( I put 2 sticks in.

New case exhaust fan (

New and faster DVD combo drive (

New Video Card Gforce GT-240 (

Also I run with 2 screens most of the time screen #1 is a 32" Sanyo and screen #2 is a 46" Sansung. I run 2 external hard drives both 2TB and some times plug a 3rd one in with is 500GB. Also charge phones and Ipods with the USB cables.

All this said I know I'm under powered and I'm getting worried. I want to put the AX850 Corsair ( This unit is about 0.8" longer. There is a latch holding the one that is in there fight now which with the new one it will be too lone I believe to latch in. Specs on the one currently installed (

Can I put this in with out any case modifications or would you suggest something else.

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March 22, 2011 at 09:01:03
OK, here is what I see. According to the specs of your HP desktop it originally came with an add in GeForce 9500M GS. You have evidently added the Gforce GT-240. The geforce card draws a max. of 70 watts. That is a low power card.

The other items you mention are inconsequential. If you need to upgrade at all, going to an 850W PSU is gross overkill and a wast of cash.

Post the full specs of your current PSU off the label. It is likely you have no problems with your current PSU.

You can monitor voltages in real time with utilities like CPUID or Speedfan. Either one will run in the tray and you can see what your voltages are. If the voltages stay steady and are within 5% of the default values for each rail, that would be an indication there is no problem.

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March 22, 2011 at 09:03:32
You're not underpowered. The additional RAM & cooling fan added very little to the load & the GT 240 is has very low power requirements. If you feel you need peace of mind, go ahead & upgrade, but you certainly don't need an 850W unit for that configuration.

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March 22, 2011 at 09:44:55
Thanks for the info, Seems I was worried about nothing. If I was going to upgrade the power supply I wanted one that I can use for my next computer. My nest one will be a custom build and I currently have no idea what I will put in it. I will cross that bridge when I need to.
Here are the specs from the power supply Installed
Modle # Hp-D3537f3r
Part # 5188-2859
AC Input (47-63Hz)
Dc Output
+5v =/13A * +12v=/18A
+3.3v=/15A * +12Vb=/18A
-12V=1.8a * +5Vstb=/2A

+12v & +12Vb shall not exceed 300w

Max output power 350W

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March 22, 2011 at 09:49:16
As I stated, if you want to go further with this, use CPUID or speedfan to monitor the voltages. I don't think you have a problem.

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