i5 750 @ 4 GHz Any tips ?

[Cesar67]

Any i5 750 users running on a Gigabyte UD5 ?

Just upgraded yesterday.

Had it running @ 4.2 GHz with 1.4vcore, I used some settings from here.

I want to settle on 4 GHz with voltages as low as possible.

I also got 2X2 GB sticks of G.Skill ECO which i obviously want to run as best i can however, I have absolutely no clue about memory especially DDR3.

Here is what i have at the moment, I can post VTT/PCH values if needed.

Intel Core i5 750

Gigabyte GA-P55-UD5

G.Skill ECO - F3-12800CL7D-4GBECO

Thermalright ULTRA 120

Corsair HX650 PSU

 

[Cesar67]

Looks like you can adjust some of the timings.
Speed is correct - 800 x 2 = 1600mhz.

Yeah, I was wondering if the DDR3 RAM runs 1:1 with the BCLK ?

Never saw any settings for it (Or i didn't understand them)

Set vdimm to 1.4Vish and set timings to 7,7,7,20, 88

I was a bit unsure when it had that RAM @ 1.5x when i first booted in.

Cheers mate, Will do, Be back in a tick.

 

[Cesar67]

QPI Clock Ratio [Auto]
Sys Memory Multi (SPD) [6.0]
PCIE Frequency [Auto]
CIA2 [Disabled]
CPU Clock Drive [800mv]
PCIE Clock Drive [800mv]
Clock Skew [0ps]
=======================================
Memory
=======================================
Performance Enhance [Turbo]
Dram Timing Selectable [Quick]
Profile DDR Voltage [1.5v]
Profile QPI Voltage [1.1v]
Channel Interleave 6 [Auto]
Rank Interleave 4 [Auto]

Load Line Calibration [Level 2]
CPU Vcore [1.375v]
QPI/VTT Voltage [1.2v]
PCH Core [1.12v]
CPU PLL [1.8v]
DRAM Voltage [1.4v]

All Others [Auto]


Would not boot at Load Line Calibration Level 1.

 

[Cesar67]

why is your memory at 600mhz now?

I don't know, What would have changed that ?

 

[Cesar67]

Tried with 8 and BSOD, Upped the DRAM Voltage to 1.5v Still BSOD.

Back to 6.

I have managed to boot @ 8-8-8-24/88 with 8X Memory Multiplier.

Command is 1T, Does this make any difference ? I normally see peoples at 2T.

 

[Cesar67]

Same system bar the cooler and max i can go is 4.1, with the F8 bios you can go up to 21 multi although i think that just forces turbo mode even though its on already.

Aye, 21 multi is turbo on one or two cores ?

Can you post your voltages mate ?

What temps are you getting ?

I can hit 80C running prime, I don't want to try LinX

 

[Cesar67]

Stuck LLC to [Standard] and still (Short term testing) stable @ 4 GHz.

Lower volts (1.28v ~ 1.3v) means lower temps, Average around mid sixties in a heated room.

Cheers for that wee tip, Most reviews i read said to use LLC.

 

[Cesar67]

Any pro overclocker care to comment on Load Line Calibration? Is it better to use it or not use it?
I am using it and prime95 failed after 3 hours at 1.29vcore and I am now priming with 1.3vcore at 4ghz (both with LLL on, I realise the vcore would be about 1.45v without).

Stuck LLC to [Standard] and still (Short term testing) stable @ 4 GHz.

Lower volts (1.28v ~ 1.3v) means lower temps, Average around mid sixties in a heated room.

Cheers for that wee tip, Most reviews i read said to use LLC.

Although, I am far from an experienced over clocker, It works great for me.