Number Six wrote:
You chose a very expensive set of RAM designed for high-end OCing. Since you are planning to keep the RAM to CPU-stock speeds
No, bad Jipstyle. I want the Ram running at the Ram's default of 2200, which is much faster than the default for the CPU (1333).
Tech sites are getting stable 4+ GHz o/c's with slight vCore increases. I want the best stable O/C with stock vCore, and running the memory at 2200 instead of 1333.
Ah! I misunderstood. Sorry 'bout that.
Right, I don't know how much you know about the new BIOS', Chams, so forgive me if I give too much detail.
The front-side bus is dead and gone. With the memory controller now integrated on the chip, what was once the northbridge no longer exists. Instead, we have a Base Clock (Bclock, or BCLK) and a bunch of multipliers. Specifically: CPU, Uncore, and Memory.
The base clock is a frequency most similar to the old FSB and you won't go wrong by equating the two. They aren't the same, really, but if you use them the same way, you'll be ok. The BCLK of your i5 750 (and all Lynnfields) is 133.
The CPU Clock multiplier determines your CPU speed and core frequency. The 750 is 20 and is upward locked. This means that you should be able to turn it down, but never up. BIOS dependent, of course. 20 * 133 = 2.66 Ghz ... your stock speed.
The Uncore multiplier determines your uncore frequency. This is where shit gets weird. Your core frequency governs your CPU and L1/L2 caches. The uncore frequency governs the memory controller and the shared L3 cache. This of it this way: the core frequency applies only to the discrete cores whereas the uncore frequency governs everything on the chip that does not belong to a discrete core. Clear as mud? Doesn't matter .. just remember that OCing your core results in big gains and OCing your uncore doesn't really do much.
Finally, your RAM multiplier governs the speed of your RAM (duh). RAM mult X BCLK == RAM speed. Stock, your RAM Mult should be 10 ... 10 x 133 == 1333MHz.
So ... where do you want to set these things? Excellent question. It really depends on the options on your board.
You can ramp your BCLK up to 200, giving you a 4Ghz CPU speed, and put your RAM mult to 11, give you 2200 MHz RAM ... tapping out those expensive sticks of yours. Doing this without a volt boost is unlikely ... most people need to push to 1.4v to get a 4GHz speed from a 750.
I recommend dropping your CPU Mult to 14, pushing your RAM mult to 11, and trying your BCLK at 200. This will give you a CPU speed of 2.8 with your RAM maxed out. If it passes the stability tests, slowly push the CPU Mult up while bringing the RAM mult down, keeping the RAM around 2200 and seeing how high you can go without
overvolting the CPU.
Note: I haven't actually got my i7 yet, so all of this advice is garnered from extensive googling and forum reading. YMMV and I'm not responsibile for any light shows, fires, or burnt-out parts.