Originally Posted by Bravo2010
Cool, i try that one, whats the +100 MHz people get?
Perhaps you are more experienced but just in case you are OCing noob...
:::EDIT::: I dont think you need all this :::/EDIT:::
AMD use to use FSB (front side bus) which was essentially a base frequency that everything ran off of. If you had a x10 HT multi then you had 2GHz HT. With a 15 core multi, you had a 3GHz core. Things have been this way with AMD for as long as i can remember. The APUs changed... they re now using a "base freq" of 100MHz. which functions like the old FSB did. on the old FSB, you could usually get about 230MHz on almost any mobo without a north bridge voltage increase. Only the high end boards could reach 250+ MHz. I would equate this 230MHz to about 115 base freq.
Remember that this also overclocks the ram
. the A75 chipsets allow a max of 1866MHz (DDR) I have my mobo set to 1866. A base freq of 115MHz meas that it's 15% over default. so,
1866/100 = 18.66
18.66 * 15 = 279.9
279.9 + 1866 = 2146MHz
I've never found ram that overclocked well. I can never get more then about 10% over default and voltage doesn't seem to help. The ram I have is rated for 2133MHz so +0.7% is will within the 10% limit.If your ram is only capable of 1866
then you would need to use the divider in the bios. Set the ram speed for DDR1600. 1600/1866 = 0.857 which means that the 1866 is about 15% faster So add 15% to your base freq and your ram will now be running at 1866MHz.
As a side note, you may want to manually set the timing that are either printed on the ram or the packaging it came with. for example, my ram is 10-10-10-15. the bios wants to boot my ram at 1866 and set it to 9-9-9-12. 9s are faster than 10s so anything over about DDR 2050 wouldn't boot with the CL9.The annoying part
sometimes you want an even 3.5GHz or 3.7GHz. of you have a base of 115Mhz and a core multi of 32 you get 3680MHz. So close to 3.7! In this case i would usually add 1MHz to the base freq as a core multi of 33 would prob crash it. AMD useto have it's core multi in 0.5 increments. It would be nice to see those again one day.