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Thread: Just a few questions...

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    Question Just a few questions...

    Hello experts!!

    Before i get into the questions i would like to say that it has been quite a while since i have visited these forums, but i am happy to be back. When last i was here i was trying to overclock an ECS C19-SLI A1 with an Intel Pentium D950, it was my first overclocking attempt and the hardware just wasn't the best in the world. But i did get some help that taught me some of the basics of overclocking and I think that thanks are in order for: Jameson and Smith for teaching a noob how to overclock.

    I now have a new board (eVGA 780i) and proc (Q9550) and i found that the new hardware is much better at overclocking as i am now at 3.825Ghz and the memory (Corsair Dominator 1066/pc8500 2 Gig x 4) is at 900Mhz 4-4-4-12-2T for a 1:1 ratio.

    I have been using prime95 to test temps and stability. To test the temps i have been running small FFTs for ten minutes to get an approximate reading of max temps (61C with side panel open, read with RealTemp and speedfan). To test stability i have ran prime95 on blend for 24 hours with no errors or warnings.

    I apologize if some of the questions are related to RAM but i figured it would be better to keep all the questions to one post instead of two. Perhaps it should be moved if I posted in the wrong forum.

    Question #1. To be sure of stability do i need to run each test in Prime95 for 24 hrs or is blend just fine?

    #2. I have a large amount of RAM, do i need to do a custom test in order to accuratly test RAM stability or is the generic blend test fine?

    #3. Is it pointless to run the RAM faster than 1:1 with the FSB or can applications and games benefit from running the RAM faster?

    #4. What is a FSB "hole", and how do i determine when i have found one?

    #5. Even though small FFT tests show that at higher voltages/clockspeeds the temps go beyond what I am comfortable with, as i am only on air. Will these temps carry over to real world applications and games?

    #6 What would be a good program to measure performance increases/decreases and/or stress/stability tests for 8 gigs of RAM in Vista x64?

    Much thanks in advance, i look forward to reading your answers, and once again Thanks to Smith and Jameson for a good basic lesson in overclocking.

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    Welcome back!

    A few answers you requested:

    #1- Blend is just fine.

    #2- Blend test is again fine. However, if you want to get bonus points you can run MemTest for a few hours to make sure your RAM is stable.

    #3- Running 1:1 is preferred. Running odd multipliers might create a few issues, and you will not notice a performance difference. Technically speaking, an increase will be there, but it will be very negligible and you'll only notice a difference in synthetic scores. Real world applications and usage won't be noticeable.

    #4- FSB hole is well.......the point where your OC takes a dump into the black hole of despair and cannot find its way out. Generally speaking though, if one does exist, you SHOULD be able to just jump to a higher FSB and get "out of the hole" and continue OC'ing. For example, a certain mobo might have a hole at 375-395 FSB. So chances are if you just jump to 405 FSB then your OC will actually be stable (assuming you have the voltages working correctly and stable) but it won't be stable between 375-395. Go figure. It's not terribly common though, but I have seen it happen on occasion.

    #5- Prime95 will stress your temps far more than any "normal" usage and applications would. It's designed to push your hardware to the limit to ensure 100% stability. Normal daily use will not push it that hard, and certainly not for 24 hours. Maybe a few minutes at most, unless you're doing intensive tasks regularly for long periods of time such as graphic renderings, animations, etc.

    #6- Use several tests to measure the differences in performance. No single test will really give an accurate picture overall. Everest, Sandra, and 3DMark Vantage are popular synthetics. Beyond that, for real world, you can run Super-Pi, WinRAR, Office, etc with a stopwatch and chart the differences if you like.

    Hope that helps.

  3. The following user thanks Skyguy For this above post:

    Necro1 (07-05-2009)

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    thank you for your quick and explainatory answers i much appreciate it. However i have to ask a couple more questions now to make sure i understand your answers correctly.

    for the FSB Hole: if like you said the "hole" was from 375 - 395 then i should actually be able to run stabile at 396? or do i need some buffer room away from the hole. The reason i ask this is because i was trying to run at 3.9Ghz but it needed a drastic amount of voltage and i never got it stabile at 463, but i found a chart of supposed settings that should work and 466.6 was listed for 3.9Ghz. I tried for several days with various settings and couldn't get it to run stabile for more than 4 hours in prime95 blend so i dropped down to the next lower suggested setting and its like a rock. So could the 463 to 466.6 change be the differance between non-stability and stability? (havn't tried it yet, temps were through the roof at 463)

    Now for the temps: since prime95 pushes the machine far beyond normal stress levels, i could actually overclock to a higher FSB to achieve possibly a 4.0 Ghz overclock with no real world problems because of the temps. (I would still want to check for stability, but if my rig runs, lets say 10C cooler than when prime95 is running, under real world loads then it would still be considered a safe overclock?)

    Thanks again for your help, you are cheering me up on a bad day of work by the way.
    Last edited by Necro1; 08-05-2009 at 19:06.

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    With an FSB hole, assuming it's occuring, you might as well just jump 5 FSB higher. I suppose the trick is finding exactly where the problem starts and ends.

    Yes, Prime95 pushes a normal setup much harder, so I suppose you could go higher, but just keep in mind that you may get some stability problems on occasion. It might happen, it might not, but don't be surprised if you get the odd lockup or blue screen.

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