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I5 750 @ 3.6ghz 1333 ram

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April 23, 2012 8:56:48 AM

Hi,

I am revising my i5 750 OC since i am thinking of upgrading to a new GPU and i am worried about the bottleneck. Currently i have it OCed based on Tom's article with Turbo boost enabled at 160 BCLK (3.2/3.8).

I am shooting for a 3.6ghz static overclock now with low voltages and i am having trouble with my Kingston 1333 CL7 rams.
Since i used 180 BLCK to hit 3.6 (180x20) i had to choose between 1440mhz ram OC or downclock to 1080mhz ram.
Testing the 1440mhz ram with the same timings (7-7-7-20) i got errors on Prime 95 and i reverted the OC.
I want to try again and the question is : what timings can i use at 1440mhz? is 8-8-8-24 the next available?
Also if i downclock the ram at 1080mhz and use lets say 6-6-6-18 will i have any performance loss?

More about : 750 6ghz 1333 ram

a b à CPUs
a b K Overclocking
April 23, 2012 1:35:34 PM

Try triple 8 by 24 and then go from there. You can lower 24 down to 20 or so if the board allows for full manual tweaking of the ram timings. I am running a i5 760 at 3.53ghz with the turbo active. As for low volts the 750 is an earlier bin so they often need a little more extra to hit good clocks. Power consumption doesn't increase much until you go passed 3.4ghz. 20-30w for every 200mhz that you go above 3.4ghz and at 4ghz the sample is nearly twice stock power consumption so be sure that your board and cooler is solid first.
April 23, 2012 1:41:08 PM

I was fiddling with the Bios and i have a question if you know : if i select Turbo Boost and EIST enabled but disable the C1E and the C3 states does that mean i can force the x21 multi but not the x24?

Also will EIST downclock when on idle after disabling the C-States? Are those 2 separate settings or they work together?

If that is the case i will go for 175 BCLK x 21 for 3.675ghz and 1400mhz ram.

Please verify.
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April 23, 2012 4:27:26 PM

How does these look? 1 pic is stress test and other idle.

Bios settings :

Turbo Mode : Disabled
C1E : Disabled
C3,C6,C7 : Disabled
Intel EIST Speedstep : Enabled

BCLK : 180 X 20 / RAM Multi x8 : 1440 MHZ 7-8-7-20.

Apparently the CPU can downclock only with EIST enabled and Balanced Power plan in Win 7.



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a b à CPUs
a b K Overclocking
April 23, 2012 10:40:35 PM

I kept most of those setting enabled and works without any issue. Enable turbo as it raises the multiplier by 1 so when under heavy load it can hit a slightly higher clock. Factor in turbo when going to 3.6ghz so in general loads you can save a little on power and help the board in the process. Can you try and push the base clock higher like 185.
April 24, 2012 2:38:47 PM

beyond 180 BLCK and 3.6ghz the cpu needs 1.26 Vcore and it is more than i like to pump in comparing to 1.18-1.20.

any info about the Speedstep enabled and Balanced power plan? do i need the C-States since it is idling with them disabled? I am sure leaving C1E disabled, it upped my SSD scores a lot but i dont know what to do about C3,C6,C7. Should i enable them, do they offer something more?
!