OC & Modding need advice in OCing i5 750

M

madcrazyboys

Disciple
u can get my rig details frm my signature...

i used Easy Tune 6 to OC to 3ghz...
and manually
> reduced multiplier to 20 * 150MHz
> set dram voltage to 1.5

but one thing am vary of is the RAM...
its running at 1500MHz(1333)... not sure whether i can leave it the same or reduce it to 1200...

need advice -_-
 
corsair 2 * 2 1333 1.5V

as for as i noticed, ET6 n the things i do via bios seems to be the same except that et6 keeps the multiplier as 21 whereas i reduce it to 20...

but jus not sure about what the ram speed shd be...

can it be OC'd as well or it shd be below the specified level...?
 
^^

Well your choice. I never trust Windows based OC tools. The RAM should be at 1333 Mhz (or lower). Not sure how you are even managing 1500Mhz..?
 
it was running at 1500 since sat nite ^_^

n didnt face any issue at all... ^_^

not even a single slag in ne game...

but jus wanted to be sure...

a simple (dumb) question...

as per my understanding, as long as the voltage is under given specification, it shouldnt matter with the speed...

or is it the other way around...
 
^^ which heat sink are you using??? tell us about that so that we can guide you more properly..

if you try to OC it from bios, i can give some v0ltage setting to you for 3.8ghz..

try vcore as 1.24v and put the bclk to 200 and multiplier as 19...even select qpi link speed to auto and the ram freq anything wround 1333 mhz.. if this doesnt boot up, loosen the timings a bit..so you have 3.8ghz..

please only go for this if you have a after stock heatsink.. dont even think of doing it on the stock intel one!!!

here is my i5 OC at 3.8ghz @ 1.24v vcore

 
@vriship:

I do not have an i7 system, so help me out. How can the OP be running his 1333 RAM at a whooping 1500. And that too stable..?

@OP:

Regarding the speed and voltage. The voltage is what powers the chip. So when you change the motherboard setting (base clock and Mx for you), the CPU starts to do more cycles. After a certain point you need more power, so you increase the vCore, to push more juice into the silicon. Though these also heats up the chip, so constant temperature monitoring is required.
 
@vriship: currently me using stock cooler... and the idle temp it shows as 54 :-o @ 3.2@1.248V

i hav hyper 212, but dont hav the fan connectors... ll be fixing it today...

jus wondering, how come u cld push it to 3.8 but nt increaswing the core volt...?

@asingh: evn i dono how its stable... but reduced to 1240, to avoid ne prb...
 
^^^ the default voltage for i5 750 is 1.232... your stock cooler wont be sufficient to push your chip upto 3.8ghz!!! and by the way.. i just got i7 a week back.. previously i was using i5 750.. and one more setting..

bclk:- 200

multiplier:- 15..

and core voltage should be 1.016.. i did have a 3gz stable system at that voltage...

pls try and fix your hyper 212 and then go for such experiments...

if you wanna go for a new cooler then hyper212 + is the way to go.. the temps that you saw in the screen shot are using hyper212+ with mx-2 applied..
 
jus one question... how come the voltage stays low when the clock increases...?

arent they directly proportional? (am nt an expert in these... jus trying to understand b4 i lay my hands on my two month salary :-D )
 
The clock speed has nothing to do with the voltage -- in the sense, it does not drive it. See it the other way round, in order to get an 'x' speed you need to put 'x' amount of vCore. Basically the chip will need more volts/power to keep spinning at higher frequencies. They are not directly proportional. It varies for each chip even if they are same socket and model. This will explain it better. Good to see, you are researching out OC, before trying it on such expensive equipment. As Vriship, do try this on a good OEM HSF. Best of luck.
 
so if my understanding is correct,

despite what the base freq n the multiplier(ex: 20*180 @3.6), the core volt ll increase only if the procy needs more power to keep up wid that phase...

even in that case, as default the core voltage for 750 is ~1.18 to run at 2.66
if i push it to 3.2, ideally it needs more power to run it and so the core volt shd also increase rite... but in the above results by vriship the core volt is much lower... :huh:

does it has nething to do with the temp as well...?
 
^^

See there is no exact co-relation between the two. You will need to find that out yourself via trial and error. It is not like you increase the vCore 0.05V for every 50Mhz increase of CPU speed. Ideally you will have to find the baseline of your processor, absolute lowest vCore it can run at stock speeds, then work your way up. Do not take any reading/amounts of vCore from anyone else. Each chip is different. And monitor temperatures at the same time.
 
^^^ take a CHILL bro dont get ur self confused!!!!

See the default voltage when ur bios voltage setting is set to auto is the voltage which is supposed to be the adequate amount of voltage to run a particular CPU.. Now that doesnt mean that ur CPU requires that much amount actually!!! So here is where we input voltage manually in the bios and test it for stability!! and as the bios cant check for stability, it would provide some more voltage to ensure that the system should not crash or hang or become unstable!!

AFAIK the stock voltage at 2.67 with cstate , turbo, EIST disabled is 1.232 constant..

but as i said even 3ghz requires lower voltages.. i.e. can easily run around 1.000 to 1.02 volts.. that too completely stable... So this clearly shows that both the things are not directly proportional!!

madcrazyboys said:
any idea, whats intel specified min/avg/max coreV for 750?
Click to expand...

The max is 1.4v and the min specified is 0.8v...
 
^^

That is what I told him, to get the absolute baseline first of his system. To find the lowest possible vCore his system can run at stock speed. Then start the increments, and increase vCore when instability in encountered.
 
^^

eerr..you do not need to set the MAX vcore. Do this. Disable cstate , turbo, EIST. Lower the vCore directly to 0.8 and check for stability. If unstable increase the vCore till you are stable. While doing this keep the system at stock settings. This way you will find the absolute lowest vCore you system can run at. THEN, start to increase the BCLK. Only when you hit unstable system, increase the vCore.
 
thx mate...

that works pretty well for me... as of now running 3.2 @1.1 and wid min and max temp of 48 to 75(only at full load test via everest)... even at intense games, temp didnt go beyond 70...

eagerly waitin for my hyper z600...

and by the way, just to get a clear picture, what is cstate and eist... whats their purpose of being enabled and disabled...
 
^^

Putting it very broadly. These are settings which let the board and CPU dynamically control the CPU chip for voltages and speed (throttling) as per load requirement to optimize power consumption. But do remember, am stressing it again: get you system to the absolute baseline, then only begin the OC. Lowest vCore it is stable at on stock speed.
 
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