cali101 Posted February 13, 2009 Posted February 13, 2009 I quite recently got into overclocking, as I wanted to do more gaming, and as I have an E2180 (which I found on forums to be very overclockable). I managed to get it to 2.5Ghz with stock cooling and the original volts (after getting a new fan it went to 2.66Ghz). Later on, I got a new graphics card - a Palit HD4850 (the one with the big heatsink) - and I found that it limited the CPU frequency to just above 2.2Ghz. This was with a 450W power supply (which is what it recommended for the card on the ati website). I upgraded the power supply to a 650W and I got the exact same problem - the CPU frequency still doesn't go above around 2.2Ghz. I would have thought that it would've made no difference whether the graphics card was there or not with the CPU at 2.66Ghz when I got a more powerful power supply. Sorry for the long post. Share this post Link to post Share on other sites More sharing options...
Verran Posted February 13, 2009 Posted February 13, 2009 It would seem to me that there's more to this story. The video card should not affect your OC at all unless you have a weak power supply that can't handle running both. What KIND of 650W did you get? Share this post Link to post Share on other sites More sharing options...
a93j202k Posted February 13, 2009 Posted February 13, 2009 (edited) Verran is right, but there may be another reason. Did you set the PCI-Express bus frequency to 100MHz, or did you leave it on auto? Leaving it on auto is a big nono, because then it will incease along with you FSB, limiting your overclock. Edited February 13, 2009 by hojin994 Share this post Link to post Share on other sites More sharing options...
cali101 Posted February 13, 2009 Posted February 13, 2009 (edited) It would seem to me that there's more to this story. The video card should not affect your OC at all unless you have a weak power supply that can't handle running both. What KIND of 650W did you get? Its an Atrix 650T from dabs. And I left the PCIE frequency at 100Mhz. Edited February 13, 2009 by cali101 Share this post Link to post Share on other sites More sharing options...
paulktreg Posted February 13, 2009 Posted February 13, 2009 (edited) Its an Atrix 650T from dabs. And I left the PCIE frequency at 100Mhz. I have tested an Atrix power supply here on OCC. Not the best! ....and the Atrix 650T is only 16A on the single 12V rail! (Your graphics card will need 10A when working hard). I would suggest a replacement as soon as possible. If you aren't sure then ask for help. Cheers Paul Edited February 13, 2009 by paulktreg Share this post Link to post Share on other sites More sharing options...
cali101 Posted February 13, 2009 Posted February 13, 2009 I have tested an Atrix power supply here on OCC. Not the best! ....and the Atrix 650T is only 16A on the single 12V rail! (Your graphics card will need 10A when working hard). I would suggest a replacement as soon as possible. If you aren't sure then ask for help. Cheers Paul How many amps would you suggest then??? I did hear that the 4850 is a card that needs a lot of power. Thanks for the help by the way people! Share this post Link to post Share on other sites More sharing options...
paulktreg Posted February 13, 2009 Posted February 13, 2009 (edited) The Atrix 650T is Edited March 27, 2009 by paulktreg Share this post Link to post Share on other sites More sharing options...
Verran Posted February 13, 2009 Posted February 13, 2009 Verran is right, but there may be another reason.Did you set the PCI-Express bus frequency to 100MHz, or did you leave it on auto? Leaving it on auto is a big nono, because then it will incease along with you FSB, limiting your overclock. I have never had this be an issue for me. The only way I see this happening is if you use a proprietary software OC suite that does OCs by percentage. Then maybe it would OC the PCIe bus without your knowledge. I have never seen a board that will OC the PCIe when you raise the FSB. Maybe on low-end boards? I don't know... Share this post Link to post Share on other sites More sharing options...
cali101 Posted February 13, 2009 Posted February 13, 2009 I have never had this be an issue for me. The only way I see this happening is if you use a proprietary software OC suite that does OCs by percentage. Then maybe it would OC the PCIe bus without your knowledge. I have never seen a board that will OC the PCIe when you raise the FSB. Maybe on low-end boards? I don't know... Well thanks for the help, and I'll save up some money to get a PSU with a higher ampage. Adios! Share this post Link to post Share on other sites More sharing options...
cali101 Posted March 25, 2009 Posted March 25, 2009 Just got a new power supply:- 600W - 18A - Dual rails Makes no difference at all! :@ Calimero Share this post Link to post Share on other sites More sharing options...
RJR Posted March 25, 2009 Posted March 25, 2009 Hi cali101, If you can post some pics of your Bios settings and temps (under load or OCCT graphs) that would be very helpful. Without those it's just kinda poke and hope. Also what PSU did you get? Share this post Link to post Share on other sites More sharing options...
cali101 Posted March 27, 2009 Posted March 27, 2009 (edited) Here's the OCCT ones, taken over 1 hour, can't find my card reader for my camera though so i'll get the BIOS settings to you later... and it's a:- CIT 600UB Edited March 27, 2009 by cali101 Share this post Link to post Share on other sites More sharing options...
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