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Old Jun 19, 2010, 01:50 PM   #1
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Thacker
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Default Can a weak power supply limit overclocking?

Hey guys,
I recently purchased a HD4890. I have the card overclocked to 890 / 1080 stable... however if I go any higher than that I get artifacting and complete computer lockups.

I am using a thermaltake 650watt PSU, which only has 18a on the 12v rails (4)
I know that overclocking is like rolling the dice... some cards can do it better than others but from what I am reading online MOST people are able to achieve 930-950 on the core and 1120-1150 on the memory without any issues.


Would upgrading my PSU in this case possibly allow for a higher overclock?

Thanks,
Brandon
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Old Jun 22, 2010, 01:24 PM   #2
Mystik
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sounds like it's just the card limiting you.

with my system specs, my computer is only pulling, at full load (ibt + furmark)
about ~320W.

my video card, a 4870, can only do 800MHz on the core without any issues
cropping up. Memory @ 1000MHz causes errors after hours of gaming.

almost every person out there with a 4870 that i've seen post about
overclocking can get much higher on the core than i can.

i just chalk it up to getting a dud overclocker.

speaking of which, i need to update my system specs.
haven't updated since i rebuilt with a new system.
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Old Jun 28, 2010, 07:34 PM   #3
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Quote:
Originally Posted by Thacker View Post
Hey guys,
I recently purchased a HD4890. I have the card overclocked to 890 / 1080 stable... however if I go any higher than that I get artifacting and complete computer lockups.

I am using a thermaltake 650watt PSU, which only has 18a on the 12v rails (4)
I know that overclocking is like rolling the dice... some cards can do it better than others but from what I am reading online MOST people are able to achieve 930-950 on the core and 1120-1150 on the memory without any issues.


Would upgrading my PSU in this case possibly allow for a higher overclock?

Thanks,
Brandon
The short answer is yes, a weak PSU could affect greatly the performance of a computer, but in your case it is probably (99%) not. It looks like it is your card-configuration. What are your temperatures? What are you comparing it to? To another manufacturers? That would be completely wrong, as different companies can have different PCBs, components, voltages, cooling solutions, etc.

Try fixing your fan to 100% and try overclocking again. If it works, there is your problem - you will need a better cooling solution. If it doesn't work, it just probably needs more voltage. Try with a software method first (easier and safer). If you have money to throw or do not really care, you can voltmod your card, in which case you will probably need a better cooling solution anyway...

Your PSU sounds fine to me though and that is why i believe it does not affect your overclocking.
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Old Jul 11, 2010, 05:53 PM   #4
john19055
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Yes a weak power supply can hurt your overclockin ,but your power supply should be plenty in overclocking a 4890.Does the 4890 have a voltage control .
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Old Jul 13, 2010, 11:08 AM   #5
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Unfortunately no voltage control as this is a non reference board card.
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