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Underclocked card works

can anyone explain why my 5770 will work if underclocked but not if its stock clocked?
It crashes while playing games if it isnt underclocked. Also my computer freezes on startup sometimes, which i figure is before the underclocking is done by the computer.

I figure it uses less power when underclocked and maybe my PSU is a little short (but its ATI 4870 certified and i have a 5770 which is less power)

I cant think of anything else
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  1. Best answer
    it could be bad card, or very bad ventilated case, or you live in africa and its 50C usually.

    I will bet on faulty card. However list your specs here. PSU can be cause if its not enough.
  2. CPU: X3 440
    RAM: OCZ 4GB 1600 DDR3 OCZ3X1600R2LV4GK
    Monitor: Samsung SyncMaster 941BW
    PSU: SST-ST56F

    MOBO: GA-770TA-UD3
  3. Hmmm well that PSU isn't great but it should still at least run so I'm thinking faulty GPU.

    Just FYI, I brought my 5850 into the store I bought it briefly to check it out and they plugged it into an old rig with I think a 300W PSU and it booted up to windows fine.
  4. wolfram23 said:

    Just FYI, I brought my 5850 into the store I bought it briefly to check it out and they plugged it into an old rig with I think a 300W PSU and it booted up to windows fine.


    Booting up and playing games are two different things. When stressed a video card's power consumption will spike. Kinda like keeping you card in idle, then accelerlating up to 65mph+; your gas consumption will increase.
  5. jaguarskx said:
    Booting up and playing games are two different things. When stressed a video card's power consumption will spike. Kinda like keeping you card in idle, then accelerlating up to 65mph+; your gas consumption will increase.


    Agreed but the freezing at startup is what I'm going on.
  6. That PSU should certainly be enough but you may have a faulty unit. Hard to tell whether it is the card or the PSU really without isolating them. Do you know someone else with a computer with an acceptable PSU that would let you install the card to test it?
    You also may want to try reinstall the drivers. Uninstall and run driver sweeper in safe mode then reboot and install the latest Catalyst Control Center from the AMD site.
  7. Best answer selected by chico1st.
  8. no accessible PSU, all my friends are lame :(

    its a certified PSU at AMDs site for the 4870 so they say its fine

    im going to RMA it.
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