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  1. #1
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    My 955 / UD5P overclocking

    I have a 955BE (cooled by s1283 with stock fan) in a Gigabyte 790FXT-UD5P AM3 motherboard with 2x2GB Corsair DHX CAS9 DDR3 1600. I have been testing different overclocked settings a few hours a day for almost a week and have made the following observations:

    At stock speeds/voltages, my idle temperature is 40-42C and load is typically no more than about 51C.

    I can get to 3600MHz by doing 200x18 with only a .05v increase (cpu voltage reported around 1.392 volts in CPU-Z) and no noticeable increase in temperature. I'm still working on further multiplier increases, but it looks like a x19 multiplier will require a lot more voltage than the x18.

    I can get to 2400MHz on the CPU-NB with an increase of .1v but this jacks my temps way up to about 44-45 idle and 57-59 load. I can get the NB to 2600MHz with another .075v for a total increase over stock voltage of .175v but again, my temps are really high. Running IBT, I have seen the Core temp reach 62C (via AOD and Speedfan).

    I can do 3600/2400 rather easily with the aforementioned voltages. What I would like to do though, is 3800/2600. I suppose I could settle for 3700/2600 or so (after ref clock tweaking).

    My questions:

    These temps seem awfully high. I know that the Xigmatek fan isn't the strongest in the world, and I may swap it out and remount the cooler in a few days when new case fans come, but to hit 62C with only a nominal +.05v on the CPU-VID and +.175 on the CPU-NB under full 4 core load seems a little odd. Are these results typical for the s1283 and AS5? I have a feeling the heat is what's holding me back from getting to 2600 on the NB and I think the NB heat is preventing me from doing 3800/2600 or 3800/2400, though I have to try the 3800 with more voltage than +.075v (been working on the CPU-NB first).


    Any ideas what's keeping me from 2600 on the NB?
    Is the heat out of line for my setup?
    Last edited by Atheist; 07-08-2009 at 09:55 AM. Reason: added links to pics



  2. #2
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    Re: My 955 / UD5P overclocking

    Since your only using the multiplier to OC then there is no reason to raise the HT link or the cpu-nb. Actually even if your OC'ing by raising the HT (fsb)you still don't need to raise the HT link or the CPU-NB.
    I'm running a 940BE @ 3875Mhz with a HT of 250Mhz and I have my HT link at 1750Mhz and the CPU-NB at 2250Mhz and it's smooth as silk.
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  3. #3
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    Re: My 955 / UD5P overclocking

    You're right in that I probably could go higher on the multiplier by not touching the NB, but this and other threads at XS show improved performance with a higher NB so I thought I'd try it out. How much voltage did you have to add to your CPU to get that clock rate?

    2600 (200x13) on the NB seems to be stable with +.2v. Once I know for sure that it's stable I'll try to increase the CPU multiplier until I'm at +.2v on that too, temperatures permitting. I'm gonna have to remount my s1283 I think because my temps are a little ridiculous under Prime95 and especially so under IBT.



  4. #4
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    Re: My 955 / UD5P overclocking

    I'm running 1.525v to the CPU but I'm water cooled and my load temp NEVER gets above 50c.
    Electronic Smoke Signals From my "Techno Teepee"
    ASUS Crosshair V Formula AM3+ 990FX, 1703 bios
    AMD FX 8350 Vishera @ 5142Mhz [21x244] 1.536v
    Water Cooled - Koolance EX2-1055, CPU 370 WB, Idle=22c Load=53c
    32Gb G.Skill Sniper ddr3 1600 8G X 4 , 9-9-9-24 @ 1.55v
    ASUS HD7970-DC2T-3GD5, Cat 13.6 beta 2, Dell U3011 @ 2560x1600
    SanDisk Extreme 120GB SSD SATA 6Gb, 250Gb SATA 6Gb, 1Tb SATA 6Gb x2
    Win 7 Ultimate 64bit, Corsair Obsidian 800D, Corsair HX1000w PSU

  5. #5
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    Re: My 955 / UD5P overclocking

    Well I remounted the HSF and added a case fan (and replaced a broken one). I'm now idling at stock @ 31C in a 75F room. I'll put pics up in the morning but let's just say that only 2/3 of the IHS had AS5 on it. Yeah, a bit of a problem. Hopefully OC temps stay within reason now.



  6. #6
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    Re: My 955 / UD5P overclocking

    I got 3 SlipStream 120mm 1200RPM yesterday, so I replaced my broken TriCool and added a fan to the front intake in the upper chamber of the P180. I turned the rear fan around to suck cool air in onto the HSF. The top fan is the only exhaust. Seems to work well so far. I also remounted my HSF and here's what I found when I took it off:







    2/3 coverage... no wonder I was hitting 62C.

    I cleaned the AS5 off of the CPU and HSF, reapplied, and mounted it better:



    I now idle in the mid 30s and max out with the NB at 2600 (+.2v) around 55C. My case isn't quite silent anymore, but it's still not bad - I just hear the gentle "woosh" of air.

    2800 on the NB wasn't stable at +.25v so I backed it down to 2600/+.2v and tried a multiplier of x18 on the CPU to get 3600/2600 at +.05/+.2, CPU/NB respectively.



  7. #7
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    Re: My 955 / UD5P overclocking

    It is my understanding, I saw someone write HT (FSB), that those are two different things, correct? FSB is 200 Mhz stock on these boards, but the HT has a 9x multi for 1800 mhz, or 10x for 2000 on some boards.

    Anyways, I have the same board without the "T" its the DDR2 version. I came from a DFI 790FX-M2R and this Gigabyte is my first, but let me say its INCREDIBLE! My Phenom 940 could NOT get the memory controller past 1800 mhz (stock on 940, its 2000mhz on all newer phenom x4) but on this board I can easily run 2400mhz memory controller. HUGE HUGE benchmark boost compared to raising multi or FSB! The HT link is 9x on my board, but honestly it hardly does anything to affect performance. When I OC, I lower the HT to about 1600 Mhz, so when I raise FSB the HT will settle around 1700-1800mhz and not give problems. Even if you keep HT high it won't boost much at all. Its better to leave FSB (on my board anyways) around 205-220 mhz, then use the multi and NB multi to get your OC. More stability for certain!

    DFI Specs:

    Highest Multi stable - 16x
    FSB highest stable -210
    NB stable - stock
    HT link - stock.

    Gigabyte specs

    Highest Multi stable- 17.5x (so far)
    Highest FSB Stable - 210 mhz (I never get good FSB clocks!!! )
    Highest NB multi stable - 10x (raises with FSB also ex. 10x with FSB @ 200mhz = 2000 mhz NB clock and 2000 mhz phenom memory controller but 210 FSB = 2100mhz NB 2100 mhz phenom memory controller even with 10x multi)
    HT link - stock

    So far I've settled @ 205 Mhz FSB with 17.5x multi cpu, 9x multi NB + Mem controller, HT link - 9x. This gives me over 3700 mhz CPU, almost 2000mhz Memory controller and NB speed, HT link is a bit over stock, DDRII @ 1100 Mhz.

    Sandra memory bandwidth = 12.1 GB/s! On par with DDR3 speeds!
    Phenom 940 x4 @ 3700 mhz = Beats Intels I7 920!

    2x3870's @ 800mhz/1200mhz + ^ overclock = 3dmark06 @ 18363!!!

    But please remember, I'm only saying this since I just did the research, when upping the NB multi the CPU memory controller goes up with it, and its VERY DELICATE. Which means going too much over for too long of a time will kill the processor or cause major errors during processing. People have pushed theirs from 2000mhz to 2400-2600 mhz and lost their processor randomly @ even 3 months after the OC. Although you get a HUGE performance boost, its still better to just stick with FSB and multi overclocking, leaving NB multi's and HT multi's at stock. During my research I've noticed that the FSB OC alone will boost the NB And CPU memory controller enough for performance gains while maintaining safety for your components.
    Last edited by Chimaira; 09-01-2009 at 03:58 AM. Reason: Add more info.
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