P4 2.6c overclock

MoTHA_NaTuREMoTHA_NaTuRE All over this bizzatch called FL
edited February 2004 in Hardware
ok, so i got me a P4 2.6c on a p4c800e-dlx. the farthest i can push this setup prime95 stable is 237fsb on 1.58 vcore.

my kingston hyperx pc4000 is now set to 2.4-3-3-6 at 5/4 ratio.
at 1/1 ratio, i can only set it to 3-4-4-7, so kinda crappy.

i can push this cpu above 255fsb, but requires 1.65 vcore and not prime95 stable.

is this the limit for this cpu? :werr:

Comments

  • Geeky1Geeky1 University of the Pacific (Stockton, CA, USA)
    edited December 2003
    Probably. When you hit a point where you have to drasically increase the voltage to get it stable at just a very slightly higher speed, it's probably the limit for the CPU.

    Take my Athlon 1800; it does 2.51GHz with a 92mm Tornado on a SLK-900A. It'll do 2.56GHz with my squirrel cage fan assembly, but I have to bump the voltage from 1.9v to 1.95v to get 50MHz out of it. 2.5GHz is, therefore, about the limit for that particular CPU.
  • MoTHA_NaTuREMoTHA_NaTuRE All over this bizzatch called FL
    edited December 2003
    is prime95 stability a necessity? why if it's stable on sandra and 3dmark just not prime95
  • DanGDanG I AM CANADIAN Icrontian
    edited December 2003
    I'm running the same chip @230mhz, and that's as far as I can go with my sata hard drive. Any further and it gets funky on me and I get some weird errors.
    Running ~50°c under full load(f@hx2) with an SP94 and a 92mm fan that pushes about 49cfm.
  • ketoketo Occupied. Or is it preoccupied? Icrontian
    edited December 2003
    OK I have the same 2.6C and motherboard.

    at 1:1, my memory craps out above 230fsb.

    at 5:4 I can run at 265fsb (3.45GHz) and successfully complete Prime, 3DM2K1 etc. at 2-2-2-5-4 memory timings.

    BUT I have to back down to ~3.3 (253fsb) to run 2 instances of F@H stable.

    This is with VERY cool ambient temps, my case/mobo temp is usually reading around 5C (MAX, sometimes lower), depending on the weather outside - case is parked beside open window. Bios set at 1.5875v, which under load is more like 1.545v.

    Yes, I'd say you're at cpu limit barring phase change cooling or extreme (and dangerous to the cpu) voltages.

    I sent a review and overclocking guide on the P4C800-E Deluxe to MediaMan 10 days ago, but he seems to not be around, no replies yet :confused:
  • ketoketo Occupied. Or is it preoccupied? Icrontian
    edited December 2003
    MoTHA_NaTuRE had this to say
    is prime95 stability a necessity? why if it's stable on sandra and 3dmark just not prime95?

    That's fine, you can do that but PLEASE do not run Folding@Home at those speeds - if it's giving memory errors, you could very well be turning in corrupted wu's and skew the data. I personally turn down the speed to get rock solid Folding performance.

    DanG, I'd bet the ranch that it's your memory holding you back, not the HD.
  • MoTHA_NaTuREMoTHA_NaTuRE All over this bizzatch called FL
    edited December 2003
    well, i can run my memory fine at any fsb, but i need to relax my mem timings to 3-4-4-7, is it better to do this at 1:1 or run tighter timings at 2.5-3-3-6 at 5:4. i was hoping i could run this thing into the 260's. mebe should have gotten a 2.4c
  • madmatmadmat
    edited December 2003
    Try running the ram at 3-4-4-8 and see if it'll allow for a higher fsb before you get too discouraged with your 2.6c.
    I've found that my PC3700 Corsair XMS doesn't like to go too terribly fast with anything tighter than 3-4-4-8.
  • ketoketo Occupied. Or is it preoccupied? Icrontian
    edited December 2003
    Yup, you should run some benchies for yourself - some quick sandra memory + 3Dm2K1, at both highest 1:1 poorer timings AND at highest 5:4 tighter timings will give you a good indication of what's going to be faster, at least for gaming....you haven't really indicated the primary purpose of the rig, there may be other benchmarks appropriate depending on day to day usage.

    My money's on 1:1, if it will reach similar fsb to 5:4. It would be different if your memory would run 2-2-2-5, I'm susbstantially faster at 253fsb 5:4 2-2-2-5-NO turbo than at 230fsb 1:1 3-4-4-8-turbo enabed. You will likely have to turn turbo off at 5:4, at least I have to in order to stay stable. PAT always on.
  • MoTHA_NaTuREMoTHA_NaTuRE All over this bizzatch called FL
    edited December 2003
    im starting to get the feeling that my memory is not limiting me. anything above 235 fsb, and prime95 fails on the first test. even on relaxed timings of 3-4-4-8 both 5:4 and 1:1. vcore does not help much either, im not bout to push the vcore over 1.65 just for an extra 5-10mhz increase in fsb.
  • ketoketo Occupied. Or is it preoccupied? Icrontian
    edited December 2003
    OK have you got 1. Legacy USB DISABLED - this is a critical overclocking setting on this mobo 2. Turbo OFF ? - can help with stability

    Also, post all your "chipset" settings
  • MoTHA_NaTuREMoTHA_NaTuRE All over this bizzatch called FL
    edited December 2003
    hmmm, i do not have legacy usb disabled, i should give it a try

    :UPDATE: ok i just tried disabling legacy usb, the problem is still not pushing the fsb up, that is very possible, it is pushing the fsb up and keep prime95 stable, so still stuck at 235.
  • nartacnartac
    edited February 2004
    Sorry for posting on an old thread but I'm a newbie in OC. I just recently purchased the P4C800-E Deluxe motherboard with the same CPU (2.6C). I'm trying to overclock this and read what you guys were saying about ram timing but I have a question. What is this 1:1 and 5:4 stuff. I went into the motherboards bios and can't find this option anywhere. Can someone explain clearly to this newbie? Thanks for your time.
  • Geeky1Geeky1 University of the Pacific (Stockton, CA, USA)
    edited February 2004
    it's the ratio of the CPU's FSB speed to the RAM speed.

    1:1 would be 1MHz FSB = 1MHz RAM speed (pre-ddr, pre-dual-channel)
    2:3 would be 2MHz FSB = 3MHz RAM speed "
    5:4 would be 5MHz FSB = 4MHz RAM speed "

    So, if the CPU is a 200MHz bus CPU (which your P4-C is; the P4's bus is "quad-pumped" as Intel calls it):
    1:1 = 200MHz RAM speed (400MHz DDR)
    2:3 = 300MHz RAM speed (600MHz DDR)
    5:4 = 160MHz RAM speed (320MHz DDR)
  • madmatmadmat
    edited February 2004
    It might be listed under ram speed...look for ddr400, ddr333 or 320, ddr266.
    Those will decide if the ram is set to the fsb speed. it might also say ram speed by spd.
    If so set it to whatever you choose from the list, 1:1, 5:4, 2:3 all depending on the ram you've got.
  • ketoketo Occupied. Or is it preoccupied? Icrontian
    edited February 2004
    Madmat has it right. At memory setting DDR400, memory is running at same speed as fsb. So, at default, P4C fsb = 200 (800 is what Intel call it, "Quad Pumped"). At memory speed 320, memory is running 160 when fsb is 200. It's commonly called 5:4, the formula is fsb(200) X 4 = 800 / 5 = 160 memory speed (DDR320). Memory speed 266 is commonly called 3:2 ratio, runs the memory 133 at fsb200. Formula is 200(fsb) X 2 = 400 / 3 = 133.3 memory speed (DDR266).

    The purpose of having these ratios is primarily for either a) overclocking, where the cpu will handle higher fsb than the memory will or b) for people who have older, slower memory.

    For example, my cpu runs all day long at 253 fsb but no way will my memory handle that. So, I set it to 320 and it runs at this speed: 253 X 4 = 1012 / 5 = 202.4 or DDR 405.
  • nartacnartac
    edited February 2004
    Man, I this forum is awesome. Lots of friendly and helpful ppl. Thanks for the reply guys.
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