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Poll: I5 - Lets Get Clocking!!!

Discussion in 'Overclocking & Cooling' started by rjk, Sep 8, 2009.


Who is Right?

Poll closed Sep 15, 2009.
  1. Big.Wayne

    90 vote(s)
  2. easyrider

    128 vote(s)
  1. rjk


    Joined: Aug 8, 2007

    Posts: 25,237

    Here we go guys :D

    As i did with the i7's, im going to see how far we can push things with i5 and how the performance relates to its bigger brother i7.

    I have only been allowed a short period of time to familiarise myself with the new tech so my results are far from the max obtainable.

    i5 clocks just like i7, there is a BCLK [Base Clock] which is the bus speed of the chip, also there seems to be similar multipliers [low to mid 20's].
    The i5 750 has a multiplier of 21 just like an i7 920. this meant that i was in familiar territory. The 750 doesnt feature hyperthreading in the same way the nehalem chips for socket 1156 do.

    The BIOS of all the boards has a similar layout to that of the X58 counterparts

    there is little difference between the bios of an Asus P6T Deluxe X58 and an Asus P7P55D Deluxe P55

    the notable difference is that all boards seem to like 1000mv being put through the cpu diff amplitude

    voltage wise - the 750 seemed to need around 1.35v to get stable at 4ghz
    this is slightly more than needed for an i7 920 but this is all relative of course

    the memory controller has its own IMC [internal memory controller] voltage in the bios, be warned though - this does add to the heat dump of the chip considerably. The smallest changes seemed to increase temperatures drastically.


    Test Setup
    • Intel Core I5 750 Processor [this is a standard retail chip]
    • Asus P7P55D Deluxe Intel P55 Motherboard
    • Corsair Dominator GT 1866MHz DDR3 Memory
    • Nvidia 9600GT Graphics Card
    • Corsair 650w PSU
    • WD Velociraptor HDD with Vista 64SP2

    I used watercooling to get my results
    • D5 Vario Pump
    • EK SUPREME Waterblock
    • Thermochill PA 120.4 Quad Radiator
    • 4X 120MM Delta Fans

    the deltas meant the cpu was idling in windows at just below sub ambient temperatures :p

    I started out with [what now] is a standardised clock target

    200 BCLK X 20 @ 1.35V


    then i raised it up a bit

    200 BCLK X 21 @ 1.40V


    notice the memory timings on this run, i managed to achieve great timings on the memory of CL7 8-7-20 1T @ 1600MHz
    partly due to to the Elpida Hyper IC's on the fantastic Dominator GT but also due to the IMC on the chip which has performed far in excess of my expectations

    Stability at 4.2Ghz with aggressive memory timings. All good so far!

    These clocks were fairly easy to obtain stability on
    I would imagine anyone could achieve similar using air cooling and minimal tweaking

    so how far does it go...
    well - i had to update the BIOS of the board to get above 200 BCLK

    I managed to get into windows at 4.72Ghz. this was so unstable that opening any programs resulted in a rapid BSOD
    i settled on 4.5Ghz, whilst this failed prime95 after a very promising 10 minutes, it still looked good for some CPU benchmarks :D

    SuperPi 1M is renowned for being a quick test of CPU speeds

    for reference here is the best result from my I7 920 D0 @ 4.66Ghz
    SuperPi - 8sec 830ms

    and the best result from the I5 750 @ 4.5Ghz

    all things considered - fairly level pegging!
    a sub 10s superpi 1m result is nothing to be sniffed at - especially for a chip in this price range!

    onto wPrime

    here are a few of my recent results on the wPrime 32m Speed Test:

    1. 5sec 630ms - Core i7 950 @ 4500mhz
    2. 6sec 190ms - Core i7 860 @ 3976mhz - WOW:eek:
    3. 6sec 350ms - Core i7 920 @ 4200mhz
    4. 7sec 280ms - Core i5 750 @ 4485mhz
    5. 9sec 305ms - Core i5 750 @ 4006mhz
    6. 9sec 322ms - AMD 955 @ 4004mhz

    here are a few of my recent results on the wPrime 1024m Stability Test:

    1. 2min 48sec 780ms - Core i7 920 @ 4500mhz
    2. 3min 3sec 110ms - Core i7 920 @ 4200mhz
    3. 3min 10sec 160ms - Core i7 920 @ 4011mhz
    4. 3min 10sec 340ms - Core i7 860 @ 3976mhz
    5. 3min 54sec 760ms - Core i5 750 @ 4424mhz
    6. 12min 26sec 650ms - Athlon II X2 245 @ 3132mhz

    I am massivley impressed by the i5, it seems intel have refined their midmarket offerings and produced what appears to be a chip with good performance and value to compete in a section of the market where AMD had previously occupied alone.

    the preformance seems to be right on the money in the few benchmarks i had time to run

    I hope this gives a good indicator of whats to come

    thanks for reading


    Appendix 1

    860 Clocking results

    heres my findings today with an 860 processor on air
    i used the following equipment
    Test Setup
    • Intel Core I7 860 Processor [this is a standard retail chip]
    • Asus P7P55D EVO Intel P55 Motherboard
    • Corsair XMS3 1600MHz DDR3 Memory
    • Nvidia 9600GT Graphics Card
    • Corsair 650w PSU
    • WD Velociraptor HDD with Vista 64SP2

    i didnt really have time to do a full report so grabbed benchies i could easily obtain
    by no means are these max clocks like the testing of the 750 so take these as a guideline

    initial impressions, this is essentially the exact same chip as the 750 but with hyperthreading capability
    it clocks exactly the same as i mentioned previously with regards to the 750

    however - it does dump around 10'c more heat into an air cooler than the 750 [both chips on same cooler running at 4ghz]

    it was a little harder to gain stability on air at 4ghz with this chip - it required a lot more tweaking than the 750 which was at 4.2 after 5 bios changes on the asus p55 deluxe [which is a better board in all fairness]

    i like the Evo board, it features many of the deluxe features and overclocks nearly as far

    the Zalman CNPS10X was my cooler of choice for these tests as most of the major third party coolers dont have a bracket yet

    here is 3.8 stable on air - pretty easy, not many tweaks required - more than acceptable temperatures

    i pushed for 4ghz and got that stable in time to do some benches before i had to carry on with other things

    here is SuperPi at 3.8Ghz

    and SuperPi at 4GHz

    my main interest - and something that made me smile - is gaming
    whilst i had no games to hand to compare, i was eager to see some 3d benchmarks from the new socket

    i am putting this up against an i7 920 benchmark i have to hand

    i7 920 @ 4ghz - biostar X58 - OCZ blade@ 1600Mhz CL7 7-7-20 1T - GTX280 SLI @ GTX285 speeds
    I& 860 @ 4ghz - Asus P55 Evo - Corsair XMS3@ 1600Mhz CL9 9-9-24 1T - GTX285 SLI @stock

    the 920 rig got the following results

    the 860 got this...


    whilst a little slower than 1366 i7, this can be accounted to the dual/triple memory difference

    if it were my money, i would still go for the 750 for gaming
    but go for the 860 if you wish to get that bit extra without stepping up to x58 platform price brackets
    Last edited: Sep 8, 2009
  2. lettuce

    Wise Guy

    Joined: Oct 15, 2007

    Posts: 2,011

    Location: Bedfordshire, UK.

    Nice results, any reason you decided on the Asus to do the OC??

    Just ordered:

    Intel Core i5 750 2.66Ghz (Lynnfield) (Socket LGA1166)
    Gigabyte GA-P55-UD4 Intel P55 (Socket 1156) DDR3 Motherboard
    G.Skill Ripjaw 4GB (2x2GB) DDR3 PC3-12800C8 1600MHz Dual Channel Kit

    Have you played around with the Gigabyte's yet rjkoneill??. I'd be happy with 4.0GHZ out of that with my Corsair H50
    Last edited: Sep 8, 2009
  3. CK61938


    Joined: Jan 31, 2009

    Posts: 3,119

    Location: Fortress Of Solitude

    ah good good...you re-created it :D
  4. Happy


    Joined: Jan 7, 2008

    Posts: 7,120

    Location: Tunbridge Wells

    The thread lives again!
  5. ben90

    Wise Guy

    Joined: Jan 3, 2009

    Posts: 1,150

    Location: Wiltshire

    YAY!!!!!!!!!! :D
  6. Tolmekian


    Joined: Jan 11, 2009

    Posts: 963

    Them temperatures are brilliant, so excited :)
  7. mmj_uk


    Joined: Dec 26, 2003

    Posts: 22,190

    More interested in seeing how the i7 860's clock since these lack Hyperthreading..
  8. pendy


    Joined: Feb 18, 2004

    Posts: 273

    Thanks for the info.
  9. Geckovich

    Wise Guy

    Joined: Nov 27, 2008

    Posts: 2,239

    Location: Cambridge

    It's really nice to see the effort that's gone into this but I'm afraid I switched off as soon as I read what cooling you were using :(

    Quad rad and 4 delta fans, seriously!? That's such a rare/odd/extreme/unrealistic setup that it gives me no way of trying to deduce how hot these things would run under any cooling I could give them :(

    I appreciate you doing this for us Rich but it looks like I wont be clicking "go to checkout" just yet.

    I'm going to have to wait for more pedestrian overclocking reviews.
  10. Tom|Nbk


    Joined: Mar 12, 2006

    Posts: 21,868

    Location: England

    Those temps are impressive, what could we expect from something like the Corsair H50?
  11. Happy


    Joined: Jan 7, 2008

    Posts: 7,120

    Location: Tunbridge Wells

    But be aware there's a PA140.4 and four deltas contributing to the temps as well :D
  12. CK61938


    Joined: Jan 31, 2009

    Posts: 3,119

    Location: Fortress Of Solitude

    I have to admit you do have a fair point...Rich does overclock using water, but it's not to say you won't achieve almost similar results using air or water cooling on a dual or triple rad...but everyone has their own setup for cooling so will have fairly different temp readings...
  13. bulldog147


    Joined: Mar 22, 2009

    Posts: 5,107

    delta fan ? he probably use 4000rpm fans ? that's too loud for me!
  14. rjk


    Joined: Aug 8, 2007

    Posts: 25,237

    i chose the asus as that is what we are basing the first P55 systems on
    once the playing field is set out - myself and Yewen will develop a bundle in the same way as the 4GHz i7 bundle

    the gigabytes need a little work doing to the bioses, but the quality of the boards are excellent - i have seen the ud4 up close and it is a cracking piece of kit
    also tested the ripjaw memory, you are in for a treat!

    thats because the chip was running on a quad radiator with 4 delta fans strapped to it

    EXACTLY the same
    just more heat dump
  15. Geckovich

    Wise Guy

    Joined: Nov 27, 2008

    Posts: 2,239

    Location: Cambridge

    My CPU loop has a slim triple rad and 3 low RPM fans, not the most extreme loop ever but nice and quiet and better than an air cooler.

    I'm just tyring to work out a rough idea of how hot this would run if it's hitting 60 load on a loop which keeps them sub ambient at idle.

    I think my judgement is just clouded, for no real reason I just assumed these would run as cool as the 45nm core2s - idiocy I'm aware.
  16. Tolmekian


    Joined: Jan 11, 2009

    Posts: 963

    This please.

    We don't ask for much do we :p
  17. rjk


    Joined: Aug 8, 2007

    Posts: 25,237

    point taken - myself and Yewen do our very best to find the most unnecessary cooling solutions you can find
    the reason we didnt do a run on air is simple
    there are no high end air coolers available for the socket as yet and i mentioned that an EK supreme would fit

    i ran the loop with one delta on 1/4 speed for an hour with no problems
    temps hardly dropped

    with something like a TRUE/Megahalems/Fenrir - i would imagine temps in the 70's for a 4.2ghz oc

    my estimate
    a h50 runs a 4ghz i7 at 75'c
    so i would guess mid 60's max for this chip at 4.0Ghz - 4.2Ghz

    when i have access to a hold down plate i will post results

    in fact - i am such a nice guy - i will email corsair now!!!
  18. moppy89


    Joined: Jun 16, 2009

    Posts: 574

    4.5 is very very impressive...what do you think it can do on air though? And am I right in thinking that you can get the Phenom 955 to hit 4.0 on air?
  19. manic111


    Joined: Jul 1, 2007

    Posts: 14,864

    Location: Various

    Any knowledge of the cheaper Gigabyte boards rjkoneill? Particularly looking at the UD3 myself - in my experience Gigabyte boards clock pretty nicely, but what are they like in the lower price bracket? From the pics it doesn't look like there's a whole lot of stuff to deal with heat; is this going to be a problem?

    Or is the £115 Asus the best to go for in this price range?

    EDIT: Cheers for the clocking info by the way, looks amazing! Think it's made up my mind to break my wallet and go Intel :D
  20. ck88

    Wise Guy

    Joined: Sep 9, 2008

    Posts: 1,461

    Location: Birmingham