prescott OC help

itchy5 · Mar 8, 2005, 11:08 PM

well i was doing some OC tonight and i got into windows at 4ghz at 1.48V 5:4 ratio but it wasnt stable it errored in prime95

now what? up the core V to 1.5 or back down a little bit? temps were fine 39C idle i couldnt get a load temp but im guessing 45-47C range. help would be great

thanks
iTcHy

MiDKnYtE · Mar 9, 2005, 12:01 AM

You should be able to OC up to around 1.6v (1.4x115%). I normally don't go over around 15% over stock voltage. Some guys will say 20%. The point is, don't use more voltage than you absolutely need to.

***Zardon*** · Mar 9, 2005, 02:45 PM

Quote:

Originally Posted by itchy5

well i was doing some OC tonight and i got into windows at 4ghz at 1.48V 5:4 ratio but it wasnt stable it errored in prime95

now what? up the core V to 1.5 or back down a little bit? temps were fine 39C idle i couldnt get a load temp but im guessing 45-47C range. help would be great

thanks
iTcHy

You need to ensure your load temps are ok before trying for 1.6volts as this is getting into the danger zone on air IMO unless you have a good fan/heatsink and airflow. However, you should be ok to around 1.525-1.55 volts, but you still need to watch those load temperatures, as I dont know your system in detail or the temps etc its hard to give you a safe figure. You may also find it might not be your cpu but could be your VTT which is causing the instability, so increase the voltage to your mobo/chipset a little to test. Loosening a few ram timings might be a wise idea to isolate issues.

I recommend you get a hold of memtest+ and burn a bootable CD from the ISO file you download, as this is a great tool for testing stability before getting into windows. If you cook it too much you can hose your page file / MTF and then have to perform a new OS install which is time consuming. Memtest will give you errors if your system is failing on memory reads, it also will throw up errors if your cpu isnt stable so its a viable choice to test.

http://www.memtest.org/

itchy5 · Mar 9, 2005, 05:53 PM

Quote:

Originally Posted by Zardon

You need to ensure your load temps are ok before trying for 1.6volts as this is getting into the danger zone on air IMO unless you have a good fan/heatsink and airflow. However, you should be ok to around 1.525-1.55 volts, but you still need to watch those load temperatures, as I dont know your system in detail or the temps etc its hard to give you a safe figure. You may also find it might not be your cpu but could be your VTT which is causing the instability, so increase the voltage to your mobo/chipset a little to test. Loosening a few ram timings might be a wise idea to isolate issues.

I recommend you get a hold of memtest+ and burn a bootable CD from the ISO file you download, as this is a great tool for testing stability before getting into windows. If you cook it too much you can hose your page file / MTF and then have to perform a new OS install which is time consuming. Memtest will give you errors if your system is failing on memory reads, it also will throw up errors if your cpu isnt stable so its a viable choice to test.

http://www.memtest.org/

thanks for the help zardon

i'll try some things out tonight and let you know how it goes

edit: about the temps thing its on water so load temps shouldn't get to crazy

mike2h · Mar 9, 2005, 06:04 PM

zardon, so vtt is mb & chipset? always wondered about that. i really think my chipset is limiting my oc. not that ia m complaining about a 2.4 to 3.03 oc, i just think it could do a little better.
depending on what you say i might give that a shot, after all, my comp is running really stable & fast & we just can not have that, can we?

CDsDontBurn · Mar 9, 2005, 06:27 PM

Quote:

Originally Posted by itchy5

well i was doing some OC tonight and i got into windows at 4ghz at 1.48V 5:4 ratio but it wasnt stable it errored in prime95

now what? up the core V to 1.5 or back down a little bit? temps were fine 39C idle i couldnt get a load temp but im guessing 45-47C range. help would be great

thanks
iTcHy

whenever i take my rig to 4Ghz, i run my voltage at 1.53v. Also very important is the ram you have. You put in your siggy that you have corsair memory. What kind of memory is it (XMS, XMS LL, etc.)? What is it rated at? What can the memory do (i.e. timings, ratio, voltage). So yea.....let me know more specs on your rig and i'll be able to help you out some more on taking your system to 4Ghz stable

.

Quote:

Originally Posted by Zardon

You need to ensure your load temps are ok before trying for 1.6volts as this is getting into the danger zone on air IMO unless you have a good fan/heatsink and airflow. However, you should be ok to around 1.525-1.55 volts, but you still need to watch those load temperatures, as I dont know your system in detail or the temps etc its hard to give you a safe figure. You may also find it might not be your cpu but could be your VTT which is causing the instability, so increase the voltage to your mobo/chipset a little to test. Loosening a few ram timings might be a wise idea to isolate issues.

I recommend you get a hold of memtest+ and burn a bootable CD from the ISO file you download, as this is a great tool for testing stability before getting into windows. If you cook it too much you can hose your page file / MTF and then have to perform a new OS install which is time consuming. Memtest will give you errors if your system is failing on memory reads, it also will throw up errors if your cpu isnt stable so its a viable choice to test.

http://www.memtest.org/

nice find Zardon

. I like it alot, thanks

.