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|Jun 19, 2010, 01:50 PM||#1||
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Join Date: Sep 2004
Can a weak power supply limit overclocking?
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?
|Jun 22, 2010, 01:24 PM||#2|
Radeon Arctic Islands
Join Date: Jun 1999
sounds like it's just the card limiting you.
with my system specs, my computer is only pulling, at full load (ibt + furmark)
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.
low yield toner cartridge.
|Jun 28, 2010, 07:34 PM||#3|
Radeon HD4850 512MB
Join Date: Oct 2003
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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|Jul 11, 2010, 05:53 PM||#4|
Join Date: Jun 2001
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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