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can i add 7790 to my pc Acer Aspire M3 AM3985-UR20P it has a 300 watts power supply

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November 26, 2013 1:37:39 PM

i have Acer Aspire M3 AM3985-UR20P core i53450 at 3.1 ghz 10gb ram 2 tb harddrive and specs on tiger direct say 300 watts power supply, i want a decent gaming card at least 7790 1gb , so will that work with my power supply? and if not how hard wouyld be to upgrade power supply to an oem system like this

PS acctually when i go to acer parts for power supply for m3985 the power supply they offer is 500 watts is there a way to know whats inside Acer Aspire M3 AM3985-UR20P for sure (dont have the pc here to look)

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November 26, 2013 1:45:11 PM

It wont work with a 300W PSU. You'll need a 500W minimum but if i were you id pay 5-10 more $ and get a 600W to be safe. And dont worry , the power supply will fit.
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a b ) Power supply
a b U Graphics card
November 26, 2013 1:45:30 PM

^Whatever AMD says, a 500w PSU is not required for that card... Heck, the whole system will not draw more than 200w at load.

That OEM PSU should be fine, as long as it has at least 20amps on the 12v rails. The CPU and video card draw the most power - and all on the 12v rails, so that matters a lot more than whatever total wattage they claim. The i5 and 7790 are relatively low-power parts, and you can't overclock on that motherboard, so it's possible.

Better to save and get a $50 PSU and $150 video card - then you don't have to worry about overworking your PSU, and all games will run well at 1080p.
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November 26, 2013 1:47:42 PM

The AMD site says 600W minimum, however they exaggerate what you really need. You might get away with it.

If it was me and especially with those existing specs I would just upgrade to a reputable 500-600W PSU. Better safe than sorry.
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November 26, 2013 1:57:44 PM

Synysterenji said:
It wont work with a 300W PSU. You'll need a 500W minimum but if i were you id pay 5-10 more $ and get a 600W to be safe. And dont worry , the power supply will fit.


thanks for reply:
i'm confused now what power supply is inside this computer how do i know for sure what power supply is inside Acer Aspire M3 AM3985-UR20P
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a b ) Power supply
a b U Graphics card
November 26, 2013 1:58:59 PM

berbabog said:
Synysterenji said:
It wont work with a 300W PSU. You'll need a 500W minimum but if i were you id pay 5-10 more $ and get a 600W to be safe. And dont worry , the power supply will fit.


thanks for reply:
i'm confused now what power supply is inside this computer how do i know for sure what power supply is inside Acer Aspire M3 AM3985-UR20P


If you can't physically look at it, you'll have to Google it and see if you can get specs or an image of the specs sticker on it.
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November 26, 2013 2:08:16 PM

jessterman21 said:
^Whatever AMD says, a 500w PSU is not required for that card... Heck, the whole system will not draw more than 200w at load.

That OEM PSU should be fine, as long as it has at least 20amps on the 12v rails. The CPU and video card draw the most power - and all on the 12v rails, so that matters a lot more than whatever total wattage they claim. The i5 and 7790 are relatively low-power parts, and you can't overclock on that motherboard, so it's possible.

Better to save and get a $50 PSU and $150 video card - then you don't have to worry about overworking your PSU, and all games will run well at 1080p.


thanks for the answer, i will check the sticker on power supply to see the amps , and as far as upgrading the power supply i hope ois npt hard. (never done it)
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a b ) Power supply
a b U Graphics card
November 27, 2013 7:03:18 AM

berbabog said:
thanks for the answer, i will check the sticker on power supply to see the amps , and as far as upgrading the power supply i hope ois npt hard. (never done it)


Not hard at all, just have to remember where the right plugs go on the motherboard (you can take a picture of the existing system before swapping to make sure you don't miss anything). And have a phillips-head screwdriver. And make sure you constantly touch the case to ground yourself - static electricity kills.
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