Overclocking my Opteron

[PureAppleJuice]

Basically I'm a bit of a noob at overclocking, managed to get my Opteron 165 from 1.8ghz to 2.0 using the same memory timings etc. But basically my lack of understanding of memory timings etc. leaves me stranded here; tried getting the FSB past 230 but it just isn't happening, tried upping the Vcore and such but generally don't have much of an idea of what i'm doing. Is it the memory limiting me? Any suggestions welcome!

 

[ghgh]

I think you need to lower the memory divider.

What is it currently set to? 200? so the memory runs at a 1:1 ratio with the CPU - it sounds like this else your CPU could do a lot more.

Try lowering the divider to 166 and then seeing what the FSB will do.

edit - didn't see the second screenshot but that prooves it is definitely running a 1:1 ratio so try what I mentioned and you should see more speed.

Ghgh

 

[PureAppleJuice]

Ok... How do I do that? I'm on an Asus A8N - Premium I do believe; is that lowering the frequency of the RAM... or?

 

[Cob]

Yeah it's lowering the ratio.

It's the Memclock Index Value option in the DRAM Config menu. 400mhz is 1:1, so lower it to 333mhz, or 266mhz to take the memory completely out of the equation for the meantime.

 

[GeForce]

Go into DRAM config in the BIOS. You'll see THIS screen.

The bit that says "Memclock Index Value (Mhz)" is the bit you want. By default (as the screenshot) it will be at 400mhz, which is the 200 divider.

Change it to 333 (which is the 166 divider).

200/166 ~= 1.205
230/1.205 = 190.9mhz.

Ie. with your FSB still at 230mhz and using the 166(333) divider, the memory will be running at ~190mhz.

Basically the idea is to drop your memory to a low frequency. Then you can overclock your CPU to its max without worrying about the memory holding it back.

I'm using an A8N-SLi premium, so if you want any help feel free to email me (in trust) or add me to MSN etc

Jon