Originally Posted by kcuestag
I'm giving this a try throughout the day, we'll see how it ends. At the moment with Strap on AUTO (I think, or 100, can't remember) I'm using ~1.38-1.39v for 4.7GHz, let's see if I can drop it a bit.
Originally Posted by alancsalt
When I tried it, I just changed the strap, entered 125 bclk, and adjusted ram to the nearest speed under spec. First thing I noticed was more stable. (I wasn't chasing lower vcore...I was chasing the highest OC that could pass 3dMark11 Physics and Combined tests.
...when I first got my RIVE / 3970X, I was running strap 'auto' / 100, but as reported, found that strap125 was more stable and also used a tad less v-core. But there is another advantage, but one that really only earns its mettle if you run 3 and especially 4 GPUs..the rated FSB speed increases from 3200+- MHz to 5000MHz with strap125. With 4 GPUs, I have run countless bench tests and those benches sensitive to memory almost all pick up scores, i.e. at 5 GHz, when comparing strap100 to strap125....makes some sense if you think about 4GPUs being much more sensitive to CPU bottlenecks.
...and within strap125, 5 GHz is special again - at least in a subjective 'how it feels'...at 5 GHz / strap125, the CPU and rated FSB run synchronous (5 GHz). You can test this out by opening CPU-z and watching the minute speed swings in both CPU and FSB speed.
The only 'drawbacks' are that with a changed strap speed you have to pick new memory timings - usually those slightly below what you had at strap100...but you can get lucky with that also: On my setup / RAM kit, I went from 2400 to 2333 - not enough to really affect benches much but at the same time allowing even tighter mem timings (that all depends on your RAM kit though). In addition, you can vary BCLK and get some of the (minor) RAM speed reductions back. Also, some folks experience issues with down-clocking for speedstep during idle, though I'm not one of those.
All told, strap125 is at least a very nice option worth trying, depending on your individual components...at the very worst, it gives you some EXTRA options to explore higher CPU speeds when you approach 'the wall'...and on top of strap125, you can still play with extra BCLK.