Overclocking E8500 on EP45-DS3

[Chike]

Re: Overclocking E8500 on EP45-DS3

Try the -1 MCH Reference with 1.28v VTT, then higher.
Sometimes much higher VTT is needed, I've seen users with 1.4+, but try to keep it as low as possible tweaking the references.

[yuu]

Re: Overclocking E8500 on EP45-DS3

My EP45-DS3/E8400 overclocks to 433Mhz with VTT, PLL and MCH @1.05V and that's it. ALso 500Mhz @ MCH Core 1.2V /it needs 1.16 only, 1.2 is just to be safe/ at this point only 1.05V Termination(VTT) and PLL is enough it really doesn't do anything touching those. EP45-DS3 is not like UD3, just set every voltages to normal and play with CPU and DRAM Voltages.

[gile]

Re: Overclocking E8500 on EP45-DS3

With VCORE=1.4000V,CPU PLL=1.59V,MCH CORE=1.24V,DRAM VOLTAGE=2.180V,Timings=5-5-5-18
and tRd=10 I first run Prime95 custom test FFT=800K,if passed I run Blend test:

VTT***CPU REF.*MCH REF.
1.28V*0.810V***0.790V-After 5h.28m.failed on FFT=256K.
1.30V*0.823V***0.803V-failed on FFT=800K.
1.32V*0.836V***0.816V-failed on FFT=800K.
1.34V*0.848V***0.828V-After 4h.26m.failed on FFT=160K
1.36V*0.861V***0.841V-failed on FFT=800K.
1.38V*0.874V***0.854V-failed on FFT=800K.
1.40V*0.886V***0.866V-failed on FFT=800K.

[Chike]

Re: Overclocking E8500 on EP45-DS3

The references may need to be changed with VTT, up or down, try both sides, including default.
Try 421 and 423 MHz FSB.

[gile]

[Chike]

Re: Overclocking E8500 on EP45-DS3

With the settings that gave you best results, try 50-100 CPU Clock Skew, then 50-100 MCH Clock Skew wth CPU Clock Skew 0.
They should not be needed, but never hurt to try.

[gile]

[Chike]

Re: Overclocking E8500 on EP45-DS3

Was it prime95 stable? Try to run prime95 with those settings.
MCH Core and VTT are only 1.2v according to ET6 in post #64 but CPU PLL is 1.65.

[gile]

[Chike]

Re: Overclocking E8500 on EP45-DS3

It's up ou you, 3.9GHz not bad overclock at all.