Intel Core i5 750 - Quick Question

wazza300 · 12 Jan 2012 at 02:01

You realize speedstep or power saving states only work on normal and auto CPU voltage setting? With a fixed CPU voltage then CPU won't throttle

However if you set CPU voltage to normal you can use dvid to add extra voltage + or take off extra voltage - only at load,and CPU will downclock at idle

To work the dvid amount you will need,first you need to find out what amount of voltage you need to be stable at your oc,and see what voltage is used when you set CPU voltage to normal and subtract the stable from normal amount and enter it into dvid,safe CPU voltage can be anything upto 1.4v although personally I wouldn't use that much,qpi/vtt no more than 1.25v imo

Same thing for asus boards only dvid is called CPU voltage offset

pastymuncher · 12 Jan 2012 at 09:42

On the Asus boards the dvid wazza300 is on about is the offset voltage under the CPU voltage tab. I found i need to apply a notch extra when setting the offset than just a straight over voltage.

Thekwango · 12 Jan 2012 at 16:06

beejjacobs said:
Will do, one last question. There seems to be loads of info on SB i5s, but whats the max vcore we can use? Obviously I aim to be way off the limits!

think max vcore as recommended by intel is 1.4v

it'll be in here somewhere

http://ark.intel.com/products/42915/Intel-Core-i5-750-Processor-(8M-Cache-2_66-GHz)

Blue160 · 12 Jan 2012 at 16:14

I've had my 750 at 4.1GHz for over a year now with no bluescreens. Brilliant clocking chips. Temperatures in the 70's are nothing to worry about. Anything over 80 is a bit too toasty

Mak3R · 12 Jan 2012 at 17:39

My 750 runs at 3.6 using 1.26 or 1.27vcore (cant remember exactly). Speedstep etc is all on, so I found it a nice middle ground as I didnt need it burning away at max speed all day everyday.

beejjacobs · 13 Jan 2012 at 00:14

wazza300 said:
You realize speedstep or power saving states only work on normal and auto CPU voltage setting? With a fixed CPU voltage then CPU won't throttle

However if you set CPU voltage to normal you can use dvid to add extra voltage + or take off extra voltage - only at load,and CPU will downclock at idle

To work the dvid amount you will need,first you need to find out what amount of voltage you need to be stable at your oc,and see what voltage is used when you set CPU voltage to normal and subtract the stable from normal amount and enter it into dvid,safe CPU voltage can be anything upto 1.4v although personally I wouldn't use that much,qpi/vtt no more than 1.25v imo

Same thing for asus boards only dvid is called CPU voltage offset

Thekwango said:
think max vcore as recommended by intel is 1.4v

it'll be in here somewhere

http://ark.intel.com/products/42915/Intel-Core-i5-750-Processor-(8M-Cache-2_66-GHz)

Thanks guy.

I'm not bothered about a huge OC atm, 3.2Ghz @ 1.176V. Has been running prime for about 5/6 hours now! Will check out the voltage offset. Seems to downclock to 1.4Ghz, is it just that it is not reducing the voltage?

beejjacobs · 13 Jan 2012 at 03:13

wazza300 said:
You realize speedstep or power saving states only work on normal and auto CPU voltage setting? With a fixed CPU voltage then CPU won't throttle

However if you set CPU voltage to normal you can use dvid to add extra voltage + or take off extra voltage - only at load,and CPU will downclock at idle

To work the dvid amount you will need,first you need to find out what amount of voltage you need to be stable at your oc,and see what voltage is used when you set CPU voltage to normal and subtract the stable from normal amount and enter it into dvid,safe CPU voltage can be anything upto 1.4v although personally I wouldn't use that much,qpi/vtt no more than 1.25v imo

Same thing for asus boards only dvid is called CPU voltage offset

Thank you very much for this. Before doing this the clock would drop down, but it would still be loud/relatively hot as it was obviously pushing more volts than it needed for idle.

All settled now

EDIT: I keep pushing the voltage lower and lower, and it seems to be OK!? I mean nothing I do will come close to Prime as far as stressing the CPU out, so if its works with Prime it should work everyday for me. Currently on 1.072V...

Havana_UK · 20 Jan 2012 at 09:58

My i5 750 is at 4GHz on Asus P7P55D Pro, with a tad over 1.36VCore. Using a Megahalems with a single low RPM Akasa fan I idle at <30C and full load (IBT on max) I don't exceed 78C on any core.

Prime95 / Seti@Home / Folding, max CPU temps don't exceed 70C, and gaming temps rarely reach even 65C.

This is with SpeedStep on, but manually setting the VCore. I couldn't get it stable using Offset voltage.

For reference SpeedStep still works with manual VCore setting in that the CPU multiplier turns down (to a minimum of 9) thus slowing the CPU down, but the voltage doesn't drop like it would do if you were overclocking using Offset Vcore.

I'm using 20 x 200Mhz. Couldn't get the CPU stable at any higher speed without a lot more voltage, so settled happy at 4GHz.

pastymuncher · 20 Jan 2012 at 13:13

Havana UK, i found that using the offset i needed a extra notch or two of voltage compared to a straight voltage increase to get stable.

Havana_UK · 20 Jan 2012 at 15:43

Thanks pasty, I'm happy with temps so I might not bother messing around any more, but it's useful to know that.

beejjacobs · 22 Jan 2012 at 16:11

Havana_UK said:
My i5 750 is at 4GHz on Asus P7P55D Pro, with a tad over 1.36VCore. Using a Megahalems with a single low RPM Akasa fan I idle at <30C and full load (IBT on max) I don't exceed 78C on any core.

Prime95 / Seti@Home / Folding, max CPU temps don't exceed 70C, and gaming temps rarely reach even 65C.

This is with SpeedStep on, but manually setting the VCore. I couldn't get it stable using Offset voltage.

For reference SpeedStep still works with manual VCore setting in that the CPU multiplier turns down (to a minimum of 9) thus slowing the CPU down, but the voltage doesn't drop like it would do if you were overclocking using Offset Vcore.

I'm using 20 x 200Mhz. Couldn't get the CPU stable at any higher speed without a lot more voltage, so settled happy at 4GHz.

Thank you! Yeah I had noticed that the multiplier dropped, but it still meant it was relative hot, and I just wanted it as quiet as possible. I'll probably try a more ambitious overclock one day.