Hi all, I'm aware that this is a subject that is around all over the place, though I've spent several hours today looking for help and would like some clarification as I'm a little nervous about overclocking. Plus I've fried my brain a little with all the terminology!
My system is as follows:
E8500 (already overclocked to 3.8GHz)
Gigabyte EP45-DS5 Mobo
4GB OCZ DDR2 (full specs on exact memory here)
EVGA GTX 280 factory overclocked
Ultra 120 Extreme (AS5 paste) with a 2000RPM Sharkoon 120mm on it, + 3 others on front, side and back of an Eclipse62 case.
XP 32 bit
I've already overclocked from 3.16 >> 3.80, just by upping the FSB to 400mhz with a multiplier of 9.5, and setting the Vcore to 1.3V. My first question involves this voltage; it's the ONLY voltage i have explicitly set in the BIOS so far, and CPUZ shows a 'Core Voltage' of 1.280V. Why the disparity here? I appreciate it's only .02 of a volt, but it's quite a difference since we're talking about small numbers in the first place!
I'd like to get a stable 4.0+GHz overclock for running Flight sim X - i'm aware that the safest way to do this would be to notch up the FSB, while slowly increasing the Vcore to get stability. What other voltages do I need to adjust? What about RAM? My ram timings should be 5-5-5-18, and CPUZ shows them as such at the moment with a 1:1 DRAM ratio. Will the timings remain as that so long as I keep the ratio 1:1? Even though the timings SEEM to be correct on auto settings, I tried setting them manually today and was greeted with a blue screen upon trying to boot XP.
I'm aware that the FSB x memory multiplier = memory frequency. CPUZ tells me that my 'DRAM Frequency' is 400MHz, but the BIOS marks the 'Memory Frequency' as 800MHz. What is the difference between these two? I at least inferred that my FSB x multi of 2 gives 800MHz which matches this number in the BIOS, and thus registered a FSB : DRAM ratio of 1:1 in CPUZ, but I'm unsure of what to do with all these numbers after a further overclock. I'd never thought of any of this when I pushed it initially up to 3.8GHz a few months ago!
A further element of confusion is the G(MCH) Frequency latch, which I've set manually to 400MHz, and a multiplier of 2.00D, the lowest available for that latch (and giving the right ratio). My memory will apparently run at 1000MHz; would it be better to keep the 1:1 ratio or to sacrifice it for the faster 1000MHz?
I can take photos of the BIOS if that would help anyone, I'm just looking for help overclocking safely as high as I can get. FSX is a very CPU intensive app, and sends even the best i7s to 100%!
Thanks for your time!