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Computer is slower after installing a new graphics card and going back to old graphics card

Hey guys. So I installed a Radeon HD 7770 and my computer as a whole became slow instead. Some guys advised that it was a PSU problem and that I should get a new PSU. I figured for the time being that I should just switch back to my old HD 5570 graphics card while I wait until i can buy a new one. But after reinstalling, the same slowness I had from the 7770 persists and now I don't know what to do anymore. Typing, loading browser pages, and even simply clicking on the desktop, dragging, and selecting icons is really slow. I didn't drop $100 for this to happen..

My specs are:
Motherboard: Gigabyte Ultra Durable 3 model GA-870A-UD3
Processor: AMD Phenom(tm) II X4 840 Processor
OS: Microsoft Windows 7 Ultimate Edition (build 7600), 64-bit
BIOS: Award Modular BIOS v6.00PG
PSU: Xion 700 Watts

Any help is appreciated, thanks!
6 answers Last reply Best Answer
More about computer slower installing graphics card back graphics card
  1. overheating can be the cause
    Or installing new drivers [from radeon site ] can help
  2. If you installed the drivers from the CD that came with the card then they will already be out of date. My PC gaming was awful when I did that with my Radeon HD7850 card. One time the card did not even boot and output a display. I re-installed the latest drivers from the Sapphire site and all was well.
  3. 9617932817 said:
    overheating can be the cause
    Or installing new drivers [from radeon site ] can help


    What should I do in this case then? Just leave my computer off and wait for it to cool down? Or replace the PSU, my friend said I might've fried my PSU with the new card.
  4. andyp3001 said:
    If you installed the drivers from the CD that came with the card then they will already be out of date. My PC gaming was awful when I did that with my Radeon HD7850 card. One time the card did not even boot and output a display. I re-installed the latest drivers from the Sapphire site and all was well.


    I installed drivers downloaded from the AMD website, drivers isn't the issue in my case unfortunately :(
  5. Best answer
    sleepinxonxbed said:
    andyp3001 said:
    If you installed the drivers from the CD that came with the card then they will already be out of date. My PC gaming was awful when I did that with my Radeon HD7850 card. One time the card did not even boot and output a display. I re-installed the latest drivers from the Sapphire site and all was well.


    I installed drivers downloaded from the AMD website, drivers isn't the issue in my case unfortunately :(


    Sorry about that. Your PSU seems easily capable of running the card power-wise. You could download "Speccy" from Piriform, (http://www.piriform.com/speccy/download) which is an application that displays the running temperatures of the CPU and motherboard. That could tell you if anything is getting hot. Then you could open the case and blow out any dust build up round the CPU, etc, to help out with cooling. Then maybe do a full re-install of the card. At least by doing this you'll be narrowing down the cause of the problem. Good luck.
  6. sleepinxonxbed said:
    9617932817 said:
    overheating can be the cause
    Or installing new drivers [from radeon site ] can help


    What should I do in this case then? Just leave my computer off and wait for it to cool down? Or replace the PSU, my friend said I might've fried my PSU with the new card.


    if psu is the problem you can try these
    -download an Overclocking program that was meant for your GPU, and used it to Underclock your GPU so that it was running on specs Lower then what it was set to out of the box
    -installing new psu and ram
    Or this can also be the problem
    have you uninstalled the old driver before when installing new gpu?
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