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Upgrading Power Supply

#1MattyPPosted 10/16/2013 12:54:45 PM
I recently upgraded my computer's graphics card to an AMD Radeon HD7750.
I wanted to upgrade as little as possible in the computer to try and get a performance boost.
I do find that performance has increased, however, my framerate stutters every now and then and I can hear the card's fan stuttering a little as well.

I think the problem is that I just don't have an adequate power supply for the card, which i was skeptical of even when I initially did the upgrade.

http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/kb/docDisplay/?sp4ts.oid=5187019&spf_p.tpst=kbDocDisplay&spf_p.prp_kbDocDisplay=wsrp-navigationalState%3DdocId%253Demr_na-c03359124-10%257CdocLocale%253D%257CcalledBy%253D&javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken

That is a link to my specific computer on the HP website, but keep in mind that I am using the Radeon HD 7750.

The specs under my PSU are
Power Supply

Internal 300W (100V-240V)
Form factor: Internal ATX
Total wattage: 300W
Nominal input voltage range: 200-240V/3A (50-60Hz)
Dimensions: 150mm x 140mm x 86mm (5.9 x 5.5 x 3.4 inches)

Am I able to just install any Power Supply with those specific dimensions, or is there anything in particular I should be looking for?
Also, if I were to upgrade the power supply, could anyone recommend a better card for my rig?
My reasoning for choosing the 7750 was that it doesn't require connection to the Power Supply other than just being plugged into its PCI-slot and my PSU couldn't really handle anything better, but if I am going to upgrade the PSU I might as well upgrade the Graphics Card further.
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We live on front porches and swing life away. We get by just fine here on minimum wage. - Rise Against
#2JockoPosted 10/16/2013 3:56:51 PM
You didn't post a budget but in my opinion this is the best value that matches your computer:

http://pcpartpicker.com/p/1PET0

Some people here my complain that your processor is a little weak but I think you'll be good if you want to play less CPU intensive games. MMO's, RTS games and sim games are typically more CPU intensive where as console ported games like Tomb Raider and Bioshock are more GPU intensive which is what this setup would do well with.
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The oxygen's leaving my brain!!! --Clucky the Chicken
()===={SWORDSWORDSWORDSWORD> It's my SWORD sword.
#3Sergei_DukanovPosted 10/16/2013 4:01:32 PM
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150671

and

http://www.newegg.com/Product/Product.aspx?Item=N82E16817171038

I have that same power supply powering a second amd rig with a phenom 965 and a XFX 6850. I have owned 3 XFX cards and had no issues out of them.
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FX8350 oc'ed 4.6ghz asrock 990fx extreme9 8gigs ddr3 MSI R9 280x antec 750W http://imgur.com/DKxtZXP http://imgur.com/I9vdXTk