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NB Strap and OCing?

R

RS3RS

[H]F Junkie
Joined
Dec 10, 2003
Messages
8,197
I have a 2.66B and an ABit IS7-E. I was told by someone from the start to set my NB strap to 533 mhZ if I was going to be overclocking. I did, and the chip maxed out at 2.9 ghZ. I left it like this for a few days, then I got bored and decided to try setting it to 667 mhZ (I think it's 667, maybe 668, I forget)... Now it's prime stable (so far) at 3.2 ghZ. :eek:

My question is this, what exactly is the NB strap and what does it do? I googled it, and seems it has to do with the memory speed, but I couldn't find much about how it comes in to play with overclocking. I have pc2700 ram that is rated to do 166 mhZ FSB 1:1, so I don't think my RAM could have been holding me back before? But just changing the NB strap got me 300 extra mhZ. :D

Anyway, a 2.66B at 3.2 ghZ is a pretty good overclock as far as I can tell. Prime's only been going for about an hour though, so I don't know if it's completely stable yet, but I have a pretty good feeling about it.
 
The NB strap setting determines the ram ratio settings for the board.
 
Not to sound like an idiot, but how is that different from the memory divider? Both times the ram was set to 1:1, so it was running at the same frequency, but this way it lets me overclock more?

Thanks
 
Ah, nevermind, I see, it's ignoring the fact that I have it set to 1:1 in the BIOS and is running it at 5:4 (that's what CPU-Z reports).

So my memory was failing me before when I had it at 2.9? It's pc2700, and with 1:1 it's not even running at stock speeds, it was underclocked... (it was running at 145 mhZ, rated for 166).

So is it my RAM that was holding me back (probably)?
 
Nah, I think that Abit board has trouble running properly if the NB strap isn't set to 667. I run my 2.6c with the NB strap set to 667 too to enable PAT on my IS7 board.
 
Ah, I see. Is there any possible way to run 1:1 with the NB strap at 667? Having my memory running at 128 mhZ without dual-channel is really killing me. It's set to 1:1 in the BIOS, but it's ignoring it and keeping it at 5:4 (that's what CPU-z, clockgen, etc. shows it running at).

Thanks
 
You running the latest bios? Try getting the latest one and see if that fixes your ratio problem.
 
Edit: Eh... I'm a noob. CAS latency was detected wrong, it was at 2 instead of 2.5. Changed it to 2.5 and I'm running 160 mhZ 1:1 :D

Thanks for your help.
 
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