Overclocking i5 750, 8GB RAM with GA P55 UD3

Nexus18

Nexus18

Nexus18

Caporegime
Joined
4 Jun 2009
Posts
32,399
Hi,

Looking for some help/advice on overclocking my i5 750 to 3.2GHz and my RAM up to 1600MHz. Motherboard is GA-P55-UD3

I have touched upon this overclocking stuff before due to problems with the PC/GPU so know a very small amount and from what I learned, I have just done again in order to achieve the above so just want to check that these are the correct settings etc.

I don't want to go any higher etc. as I want my PC to be super stable and to run cool and quiet (since my PC is right next to me on my desk), so here are my current settings, do these look ok, anything else I should do/change? Just tried it a quick game and all seemed fine with regards to temps (doesn't go above 60) and stability.

Main things I changed:

- upped the bus clock so that I get 3.2GHz and 1600MHz
- set CPU vcore to normal
- set performance mode to standard
- set dram to 1.64V
- set qpi/vtt to 1.31V
- set dynamic vcore to -0.00625V (can't go any lower)

PLxoHyR.png


OwtCJvp.png


w7OYa73.png


BIOS stuff:

QDeV0Nv.jpg


PiZ2gq7.jpg


tjAGs7c.jpg


QqCgNvq.jpg

TIA :)
 
You are doing it wrong. :p

You first need to turn off all power saving features and turbo. Bump your BLCK such that it works out at 3.2ghz. Presuming the Gigabyte board will try to guess the best voltage for that clock, boot into windows and check what voltage the cpu is at. Use that as the highest voltage and slowly work it down till it is no longer stable.

Once you find the point where it is unstable, push the voltage back up a notch or two and stress test again.

Once happy with that, turn on power states but leave turbo boost off.

Bare in mind it is more power efficient to find the max Ghz and voltage, and then use that as the target for Turbo so when you are not using your cpu it will be sitting at a lower clock therefore using less power and creating less heat.

Currently running mine at 170 blck @ 1.4v and the turbo takes it to 4Ghz.
 
Thought I might be! :o :p Saying that, the PC seems to be running pretty well so far, good temps (not much, if any different to what they were on stock settings) and no crashes so far with just games.

What power saving features?

I just opened crysis 3 to see what voltage is used with the settings in the first post:

GMcW9MZ.png


and this is when idle:

PLxoHyR.png


I have read that with the i5 750 chip to get 3.2GHz you don't need to touch voltage etc., although I changed it from auto to normal as last time I did that, the temps went up by about 10-15 degrees where as with normal preset, they aren't much, if any different.

So I shouldn't be using turbo boost with this current overclock that I have applied? What exactly does it do?

Sorry for noob questions :o
 
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Nexus18 said:
Thought I might be! :o :p Saying that, the PC seems to be running pretty well so far, good temps (not much, if any different to what they were on stock settings) and no crashes so far with just games.

What power saving features?

I just opened crysis 3 to see what voltage is used with the settings in the first post:

GMcW9MZ.png


and this is when idle:

PLxoHyR.png


I have read that with the i5 750 chip to get 3.2GHz you don't need to touch voltage etc., although I changed it from auto to normal as last time I did that, the temps went up by about 10-15 degrees where as with normal preset, they aren't much, if any different.

So I shouldn't be using turbo boost with this current overclock that I have applied? What exactly does it do?

Sorry for noob questions :o
Click to expand...

From the screenshots it looks like you don't have speedstepping/turbo enabled as it changes the mutliplier up and down depending on load.

You have some of the C states enabled which are the power saving features I was talking about (hence the voltage changing to 0.896v), my MSI fixes the cpu voltage regardless of the overclock. Check to see if C1E is enabled and C3/4 in bios (sorry not sure where you look but should be in advanced settings in the overclocking section for CPU).
 
I think turbo is disabled as I changed "performance enhance" from turbo to standard in here when I increased the bus clock to 160MHz (as it said stability should be better with standard when CPU etc. is overclocked):

http://i.imgur.com/tjAGs7c.jpg

But then in this next photo with the power saving stuff, it says intel's turbo boost tech. is on auto:

http://i.imgur.com/dDJt2Cf.jpg

Just leave the power saving stuff as they are or do I "need" to change them to something else?
 
Nexus18 said:
I think turbo is disabled as I changed "performance enhance" from turbo to standard in here when I increased the bus clock to 160MHz (as it said stability should be better with standard when CPU etc. is overclocked):

http://i.imgur.com/tjAGs7c.jpg

But then in this next photo with the power saving stuff, it says intel's turbo boost tech. is on auto:

http://i.imgur.com/dDJt2Cf.jpg

Just leave the power saving stuff as they are or do I "need" to change them to something else?
Click to expand...

Set to enable rather than Auto if you can. Also, why is XMP off? Unless you are using tighter timings than XMP which you aren't, you should use it.
 
Set which option(s) to "enable"? :p The intel turbo boost tech.?

IIRC it was due to not being able to change the DRAM voltage with XMP enabled.

I will give it a try again though.
 
Ok, I enabled XMP instead now and left all the other stuff as they were so here are the new settings?

E4hYrBL.jpg


NGYve93.jpg


sESsNsH.jpg


UfJgpO0.jpg

And CPU Z idle:

t2oyZ9y.png


Load (vcore fluctuates a wee bit)

ZlFIoX5.png


How do I put the CPU clock back up to 3.2GHz? Originally I just used the bus clock to do that.
 
Your multiplier has changed. You need to put it back up.

Also, agreed with above. If you are overclocking, disable all of the power saving features as they could cause you hassles at higher clocks.

My i5 750 happily ran at 1.35v with a 4GHz clock, and it was an average chip.

For that (going from memory as this was back in 2010 I believe) I used:

200BCLK
20x multiplier
1.35 volts on the CPU
1:8 ratio
DRAM @1600MHz
 
Ah ok, thanks!

I won't go any higher than 3.2GHz as I don't feel that I need to just yet so the default power savings should be fine for now? Main reason I OC a wee bit was just go get a bit of a performance boost and to not hold back my MSI OC 7850 as much. EDIT: Also don't want to put too much stress on my old antec earthwatts 500W PSU

What is the 1:8 ratio thing for? :confused: :o

edit:

put the multiplier back to 20x and all seems good so far. Had quite a few hours gaming last night and didn't encounter any problems. So I presume I can just leave my system as it is?
 
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you can clock much higher,should do an easy 3.6ghz-3.8ghz

ill sort some settings out for you to try and keep all power saving on it wont affect stability

what motherboard are you using? if you put cpu v back to auto or normal (might need to set stock clocks to get a true reading)

then post what amount of cpu v is used in the bios
 
Thanks for the reply :)

Yeah I have read that these are superb chips for overclocking and would go higher (as long as temps don't increase much further as I hate the fan noise :p) but I am bit concerned about it due to my antec earthwatts 500W PSU (especially when it is at least 6 or so years old now)

Motherboard is ga p55 UD3.

Currently I have these settings:

- CPU vcore to normal
- performance mode to standard
- dram to 1.64V
- qpi/vtt to 1.31V
- dynamic vcore to -0.00625V (can't go any lower)
- XMP enabled
- cpu clock ratio set to 20x

According to cpuz, the core voltage fluctuates between 0.880V and 1.120V when idle and with a game launched it is mostly around 1.120V

Also, in CPuz it says the multiplier is x21, I set it to x20 in the BIOS :confused:
 
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you need to look in the bios for default cpu voltage once set to normal

I just need to know what it uses so I can give you dvid settings
 
ok try

180x20 bclk for 3.6ghz
8x mem multi for 1440mhz (speed is affected by the bclk you use so 8x 160blck = ram speed of 1440mhz)

same qpi/vtt for now
dvid try +0.07500v for roughly 1.2v (may need more)
cpu clock drive 800mv
pcie clock drive 900mv

enable spd timing then quick and enter your ram timings
 
see bclk freq in above screenshots??? set it to 180

if cpu goes to 21x multi then disable intel turbo boost
 
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