Johnson Posted February 9, 2006 Posted February 9, 2006 Had my 148 about 3/4 months now and it was quite happilly sitting at [email protected] in the bios but I wasnt very happy with load temps.Tried various heatsinks etc and have had a really good sort out of my cables etc but it still seems to get too hot. I have had to knock the clock down as it started just powering off and I was not prepared to give it any more volts. It now runs at 1.450volts @ 250 x 11 and seems to back to normal. A question now if you have got this far. I decided to break out the DMM and see if I could find what the cause of the instability was. When I went back to my original overclock I found that the chip was receiving 1.58 volts(reported 1.52) now would this overvolting,which I know is not a great amount compared to what some people put through their cpus actually damage the chip? I dont want to remove the IHS as it was a retail chip which I could obviously sell quite easily if I was to upgrade (X2 :drool: ) but I do think that the IHS is not making that good a contact with the core. Does this sound like a fault with the chip or could the problem be elsewhere? Trying to decide whether or not to go for a 4800 X2,do they O/C well and what should be the safe max voltage for one of these(read from the board not software/bios)? Thanks J Share this post Link to post Share on other sites More sharing options...
supershanks Posted February 9, 2006 Posted February 9, 2006 hi Johnson, I'd say your voltage is 2 high. I'm , running a 148 @264 x 11 9:10 24/7 my vcore is at 1.325x110% = 1.46v, can run fine above that but need 1.35x110% = 1.485v. The above show as 1.41 & 1.44v is MBM Most threads seem to suggest 1.5v as a ceiling on air cooled opterons, but i must admit have not found that i need it. Temps:_ Idle Load:- Share this post Link to post Share on other sites More sharing options...
Johnson Posted February 9, 2006 Posted February 9, 2006 I couldnt figure out why it was just rebooting so as I said I broke out the multmeter and checked all the rails and thought I know will check actual VCore. It surprised me that its so different from the bios tbh. I think I may sell this chip and get an X2 then and will make a point of checking the VCore on all future mobo purchases just to be safe. I swopped out the OCZ psu I have last night to my Hiper 580 just for a test but have not had time to measure rails and stuff on that yet but will do. I have the crappest luck with CPUs lol. J Share this post Link to post Share on other sites More sharing options...
supershanks Posted February 9, 2006 Posted February 9, 2006 Yes have not tried a multmeter yet. have currently backed down 2 the lower voltage i showed, as i think i may be starting to get some pSU instability as my 12v @ 1.485v is showing max amps with 80% loading. Would have thought your OCZ was better than your Hiper, u can adjust the pots om the OCZ ?? Not sure if your rebooting is something else, :- Memory Stability Gfx Card/Driver issues. I have the crappest luck with CPUs lol. - Yep it's a lottery :nod: This 148 is the closest i've been 2 winning so i'm pretty happy, hope u get there. luck Share this post Link to post Share on other sites More sharing options...
Johnson Posted February 9, 2006 Posted February 9, 2006 Yeah the rails are adjustable and they are correct. I threw the Hiper in just in case it was a psu issue and wanted to eliminate it more than anything else. Tried another set of Patriots I have and still the same also chucked in my PC3500 BH5 with the same results. I need to do a reinstall of Windows so might do that tonight if time permits. J Share this post Link to post Share on other sites More sharing options...
Markus_d Posted February 9, 2006 Posted February 9, 2006 what does bios report for voltage when you run it @ 1.52v windows... Share this post Link to post Share on other sites More sharing options...
Johnson Posted February 9, 2006 Posted February 9, 2006 I decided to break out the DMM and see if I could find what the cause of the instability was.When I went back to my original overclock I found that the chip was receiving 1.58 volts(reported 1.52) now would this overvolting,which I know is not a great amount compared to what some people put through their cpus actually damage the chip?J I have quoted myself above lol the info was in my original post Hope that helps J Share this post Link to post Share on other sites More sharing options...
Markus_d Posted February 9, 2006 Posted February 9, 2006 1.58v with good temps will let your core live long i think... maybe you should drop it down to 1.54-1.56v... Share this post Link to post Share on other sites More sharing options...
Bull Dog Posted February 9, 2006 Posted February 9, 2006 So voltage was reported as 1.52v, a voltmeter showed 1.58 and what did you have it set to in the bios? Share this post Link to post Share on other sites More sharing options...
Johnson Posted February 9, 2006 Posted February 9, 2006 Apologies I skim read Markus's post as I am at work. I will double check and repost my results when I get home.I will get readings from CPU Z,MBM,the bios and with a multimeter. J Share this post Link to post Share on other sites More sharing options...
Johnson Posted February 9, 2006 Posted February 9, 2006 Ok quick update, I have measured again and results are below Set volts Bios Actual MBM CPU- z 1.500, auto 1.48 1.497 1.46 1.456 1.375*110% 1.48 1.513 1.46 1.456 1.400*110% 1.51 1.533 1.49 1.488 1.425*110% 1.54 1.569 1.52 1.52 I didnt make a note of the combination of VCore * % when I got the scary 1.58 volts sorry. What can I conclude from this? Not a lot it would seem lol only that the VID % does seem to vary the VCore quite significantly from the actual shown voltages within the bios.Also its a good idea not to rely on any software or bios voltages without checking with a multimeter first as I have always done. J Share this post Link to post Share on other sites More sharing options...
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