Overclocking the CPU-NB on Phenom II's into the 2.6/2.8 range tended to put their gaming performance ahead of the Core2 line. If you want to get the most out Phenom II, you'll need to OC the CPU-NB.
http://www.anandtech.com/show/3877/...investigation-of-thuban-performance-scaling/7
So how do you arrive at the highest overclock? Do you literally push the FSB to its highest setting for each of the multipliers? I think at one multiplier setting you could reach a higher FSB, which might be the highest overclock, but how do you figure that out?
I came here to post this pretty much. Many people assume that since the multiplier is unlocked, overclocking is just a matter to adding some voltage and pushing the cores to their top speed. Really, what you want to do is use the multiplier to find the cores top speed, and than put them back down. From there push the FSB to push your NB/L3 up, find what your ram can do and your NB/L3 can do. Then, once you know where everything can get to, use the multipliers to keep the cores around that top clock, and push the FSB so the NB/L3 increase in speed.
As those cores get more clock speed they need to be fed, that's the L3/NB's job. So if the cores get faster and faster they need data faster, or the performance doesn't scale as well as it could with the increased clock. I can't say for sure, but I think the performance increase can be in the range of over 10% with, say, a 2.8GHz NB/L3 and a 4GHz core speed vs. a 2.0GHz NB/L3 and a 4GHz core speed.
So how do you arrive at the highest overclock? Do you literally push the FSB to its highest setting for each of the multipliers? I think at one multiplier setting you could reach a higher FSB, which might be the highest overclock, but how do you figure that out?
hey there.
i also use one of this cpu and need your help:
SO i am aiming for :
4.0 ghz cpu speed
1600 mhz ram speed( currently 1333mhz) - yes my ram support 1600 mhz
i want to also be able to use EPU-4 program that comes with my MOBO (Asus M4A77TD) so i can set it on High performace/Auto/Power saving, because my fan makes a lot of noise.
I tried raising the NB to 220 and multiplier to 18, but then the epu-4 program told me that it can not start under those overclocking circumstances and i really want to put the fan on Auto so it won't allways stay at full speed.
Help me with what should i change in BIOS:
NB, Voltage, Multiplier?
Cheers
Thanks for the info. 5% not worth putting the extra stress on my $60 motherboard.
I managed to do the following:
BUS: 220
NB is now at 2200mhz
multiplier x 18
Now cpu speed is 3960 mhz, ram speed is 743 mhx(1486)
I didn't do anything to the voltage.
I tried multiplier x20 but it won't boot. i don't know if i should raise the voltage or not to sustain the OC.
With the setup mentioned above ,i get a max of 44 degrees in full load.
PS: i don't understand how that voltage raising works,because it says it is raising with 0.15 v with every time i press + ,and it starts from 1.1 v,so how much should i put the voltage to a safe zone?
You're clock speed is determined by the bus and the multiplier. When you raise your bus speed, if you're not touching a memory divider, you're pushing the memory speed up. I'd add a little voltage to the NB/L3 and keep pushing that up. With an 18x multiplier, for every 1MHz you raise your bus you're adding 18MHz to the cores.
As an example, I run my Thuban at 15.5 x a 260MHz bus for 4030MHz/2600Hz. My Thuban is happy there but needs 1.5v to stay stable. If you are almost at 4GHz with factory voltage you should reach 4+GHz without an issue. Add some voltage, maybe 1.4-1.45volts would be my guess. You may need to add voltage separately to the NB/L3 to go above 2200MHz.
I think the important thing to do is overclock the cores and NB/L3 separately to find where the limits are at sane voltage. You know your cores are about as far as they will go on factory voltage. Give it a small bump and see where you can get with the cores. Once you have that number, I'd bring the cores down a bit and just work on the NB/L3, find how far you can push that. Then once you know what your cores will do and your NB/L3, use the multiplier to try and get both the cores and NB/L3 clocked up.
Thank you very much for your response .
Do pls tell me how do i increase voltage on NB? Is there a separate option in Bios?
How much should i increase the NB voltage? i just take it progressive untill my pc boots and gets stable?
Final setting:
CPU 1.45 v , 3812 mhz
19x multiplier
bus 200
ht link 2000
nb 2400
ram set on 1.65 v,latency 9 9 9 24 , 1600 mhz
final version,and stable
Hello people. I recently picked up a 960T and have overclocked it to 4.0Ghz. Coming from Athlon X3 2.9 GHz, it's a big leap in performance for me. I was wondering if anyone here knows how a 960T (x4) @ 4Ghz would compare to a Intel 2000 Series quad core? Is there a benchmark I could run to see what the gap is?
And are thubans faster than denebs? Core for core
Thanks