GA-P55-UD4 with Core i5-750 OC configuration
GA-P55-UD4 with Core i5-750 OC configuration
Hi Overclockers,
Thanks for the comments,
@lga1156_ftw
with your tips I have now got to 3.80Ghz I dropped most the settings (below) and I even got it to boot once at the default Vcore voltage at 3.8Ghz!
I can't get passed 3.80Ghz now however, as soon as I go above, it fails to boot and the BIOS resets my CPU to the base clock speed of 2.6Ghz, I even tried bringing the vcore voltage up to 1.45v. No avail, any further tips to take this 4Ghz? Or should I be happy with 3.8Ghz for this machine considering it's age.
New OC settings for 3.8Ghz
Vcore: 1.25625
VTT: 1.100
PCH: 1.050
PLL: 1.80
DRAM: 1.50
Turbo boost Off
Load line calibration On
Power saving Off
c1e , c3 c6 c7 Off
EIST Off
Temps are looking good to me, running prime95 while writing this and highest temps after about an hour are 77'C, no crashes yet...
Also I have had a decent performance increase with Company of Hero's which is awesome!
Under load the Vcore voltage is sitting at 1.264 with a Min of 1.248 showing up hwmonitor, I take it that variance is okay?
Regarding the memory as I have brought up the BCLK up to 190 and using the 8.0 SPD Multiplier the ram is now running at 1520Mhz.
Should I bring the SPD up to 10 taking the memory to 1900Mhz I notice that the specification only support 1600Mhz for these ram sticks?
I tried dropping the CL down to 7, but set off the memory alarm on boot, so I set it back to 8 CL and dropped the DRAM Voltage back down to 1.50 booted fine after that. I wonder if there's anything more I can do here? These DDR2 sticks support CL of 6, lower is better correct?
Current Settings:
CAS 8
TRCD 8
TRP 8
TRAS 24
Performance Enhance Standard
SPD 8.0
Thanks Koekieezz I'll keep an eye out for a X3470 locally now, if you think they are the best for LGA1156 socket? Pricing seems reasonable for the used market!
Thanks again for the comments, any further tips would be awesome, if I can take this a bit further... One question if I'm now at 3.8Ghz if I turn turbo boost back on will it boost me up to 4Ghz?
Also does anyone know isochronous support is? I have that Enabled
I never new OC'ing was this fun!
Cheers
Isochronous support: disable
Focus should start with CPU speed, then move to cache speed, and finally DRAM frequency/timings. Increasing BLCK will also raise DRAM frequency, along with uncore/nb frequency and QPI frequency—consider this when deciding.
Are you using a CPU clock multiplier or ratio at 20x or 21x? After disabling Intel Turbo Boost, are you restricted to 20x or can you go up to 21x? Always opt for the highest multiplier to avoid excessive BLCK settings.
Set QPI clock ratio to its lowest possible value, possibly 16x or 18x, which slightly impacts performance but allows better tuning once the stable CPU clock and uncore are identified.
Lower the memory multiplier, reduce DRAM frequency to around 1000 or 1200mhz while testing the maximum BLCK, then return to this setting after finding the optimal stable speed.
As mentioned before, higher BLCK requires a higher VTT voltage; core voltage only matters when increasing CPU frequency. I wouldn’t exceed 1.35V for the VTT with that cooler—you’ll likely reach 85°C on some cores.
Maximize the CPU multiplier to 20 or 21 as possible, then incrementally increase BLCK using these adjustments.
You can raise VTT to 1.275V and observe the effect, or try 1.300V. Avoid exceeding 1.325V with VTT.
Changing PLL voltage from 1.800 to 1.900V can help achieve over 200BKC.
Once you reach 85°C on any core during stress testing, that’s your VCORE limit; VTT can increase slightly, but it mainly affects the core.
With the x3470, you won’t face extreme BLCK issues when overclocking—currently at 4300MHz with 204 BLCK since the multiplier is unlocked. Ignore CPU voltage; you have three AIO fans.
From the link, 204-205 BLCK brings me to 3680MHz on the uncore/northbridge, so I need around 1.335VTT due to the high uncore frequency.