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#1
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OC settings advice from the experts
I'm new here. So first let me say hello and thanks in advance to all who
spare a moment to provide their thoughts. I have an ABIT IS7 motherboard with a P4 3GHz/1MB over clocked and stable at 267Mhz. So my 3GHz CPU is running at 4.005GHz. I'm using the stock heat sink and fan on the CPU. I'm running Windows XP Home Edition. I have the following settings and temperatures at idle and at load while running Prime95 v2.38 at maximum torture settings: Bus setting: 267/76/38 Memory: 5:4 (512x2 DDR PC3200) someday I'll get PC4000 and try 1:1 AGP Setting: 7:2:1 VCo 1.6v (Prime95 produces errors at voltages below 1.56v) DDRcc: 2.70v +3.3: 3.3v Temperature at idle: Sys: 34c | CPU: 54.5 +/- 5c | PWM: 50.0 +/- 5c Temperature at load (Prime95 maximum torture setting): Sys: 37c | CPU: 75.5 +/- 5c | PWM: 75.0 +/- 5c The system is rock solid at these settings and Prime95 ran error free for two hours. No crashes. No I/O problems with Sondra2005 disk drive test. Are these settings and temperatures safe? Am I walking on thin ice, or living on borrowed time? Any suggestion, comments, observations? Any suggestions on a better heatsink fan combo that will fit on this MB inside by Antec SLK1600 case (300watt stock power supply was upgraded to 450watts, hey what can I say, the case was free). Thanks, -Barry |
#2
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"baj2k" wrote in message...
I have an ABIT IS7 motherboard with a P4 3GHz/1MB over clocked and stable at 267Mhz. That's a good overclock! Bus setting: 267/76/38 As a general point, you'd be better off locking the PCI and AGP buses at 33/66. Running an overclocked PCI bus doesn't gain you any significant performance nowadays, and can cost you in component (primarily hard disk) reliability. Memory: 5:4 (512x2 DDR PC3200) someday I'll get PC4000 and try 1:1 You're actually losing quite a bit of overall system performance by running the async memory bus. As you say, PC4000 (or maybe better PC4400) is the perfect answer, but you may find that, if your current memory will run a little faster than it is ATM, it's possible that the best performance compromise may come from running 1:1 at a lower FSB. Doing it that way would also reduce the CPU's power demand, which would make the power supply circuitry happy if nothing else! Temperature at load (Prime95 maximum torture setting): Sys: 37c | CPU: 75.5 +/- 5c | PWM: 75.0 +/- 5c That PWM reading is very, very hot. Unsurprising given the amount of current the CPU will be pulling under load. It's also possible that the CPU is throttling, cutting back the performance. You can check this by downloading ThrottleWatch and leaving it run during periods of extended intensive utilisation. Are these settings and temperatures safe? I'd be uncomfortable running this system with the PWM temps as high as they are, while I'd also want to check for CPU thermal throttling before deciding whether the existing thermal solution on that was sufficient. At minimum I'd be thinking about heatsinking the power MOSFETS and directing a source of cold air directly onto that area of the board. Am I walking on thin ice, or living on borrowed time? Questions like that are always almost impossible to answer with certainty or evidential backing, unless you're a motherboard manufacturer with access to proper test data. Which, of course, none of us are. Any suggestions on a better heatsink fan combo There are a few heatsink/fan assemblies that'll do a better job than the stock product supplied with the CPU. Difficult to suggest one in particular. -- Richard Hopkins Cardiff, Wales, United Kingdom (replace nospam with pipex in reply address) The UK's leading technology reseller www.dabs.com |
#3
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"Richard Hopkins" wrote in news:4209fe75$0$16577
: First of all thanks for the thorough and very informative reply. I've done some case baffling to dirrect the air in a more efficient manner and have droped average case, CPU and PWM temps under Prime95 maximum torture settings by ~3c. While significant I'm assunig that's not enough. I do have a question and I'm not asking for an implied warrenty, and if I blow this thing up it's nobodies fault but my own, but what is the maximum CPU and PWM temp's you'd be comfortable running. This thing ran in the high 60's C on Prime95 at stock 200MHz / 3.0GHz CPU speed. I'd say it gained ~ 8-10C at 267MHz. ThrottleWatch Here's the ThrottleWatch data @ 4.005GHz The first throttled data point was at CPU temp of 68c. No throlling seemed to occur until that temp. Max temp was 72.5C +/-5C on CPU and 71.5C +/-5C on PWM; temp fluctuates up and down quite a bit on the ABIT EQ monitoring app, but never exceeded ~ 77C. ThrottleWatch Journal file -------------------------- Time Load Throt. Clock 460 51 11 4034 1459 45 11 4047 2462 37 0 4009 3455 51 0 4009 4459 52 0 4020 5459 51 55 4036 6461 55 22 4009 7462 52 11 4032 8456 55 22 4010 9460 51 22 4036 10458 55 22 4022 11458 51 20 4036 12455 51 22 4040 13460 50 33 4033 14468 52 11 4010 15455 52 33 4043 16454 51 22 4038 17555 50 44 4009 18457 55 10 4009 19459 50 33 4040 20459 55 55 4009 21457 51 44 4040 22457 56 11 4013 23459 52 44 4029 24458 52 22 4036 25459 51 20 4045 26460 51 33 4041 27458 55 55 4009 28456 51 22 4031 29455 55 22 4009 30457 51 33 4038 31454 55 33 4009 32454 52 20 4037 33461 55 44 4022 34459 51 44 4029 35462 50 44 4028 36455 51 44 4060 37454 52 22 4047 38455 51 33 4045 39458 52 20 4032 40461 55 33 4009 41455 51 44 4014 42458 55 11 4009 43456 51 66 4015 44465 56 22 4019 45460 50 44 4037 46459 51 40 4028 47557 51 22 4009 48463 55 22 4009 49459 51 22 4028 50457 51 22 4042 51460 50 33 4031 52458 55 22 4006 53460 51 30 4027 54463 55 55 4009 55462 51 33 4034 56459 55 55 4023 57458 51 33 4048 58458 55 77 4012 59458 52 66 4040 60457 51 30 4035 61458 51 22 4041 62461 51 22 4039 63455 55 44 4002 64460 52 0 4019 65459 55 33 4009 66459 51 33 4040 67461 55 70 4008 68462 51 33 4048 69459 56 33 4015 70460 51 55 4049 71454 51 100 4045 72459 52 44 4027 73458 51 55 4044 74460 55 0 4009 75464 51 11 4936 76513 54 22 4009 77566 52 44 4020 78454 55 44 4020 79459 55 22 4011 80460 52 33 4047 81461 55 0 4018 82458 52 55 4040 83462 51 55 4044 84463 51 55 4037 85458 52 33 4039 86463 55 77 4009 87456 52 22 4044 88464 55 70 4001 89464 52 33 4050 90462 55 77 4009 91464 51 44 4027 92455 58 33 4022 93456 51 55 4036 94454 55 11 4027 95459 50 70 4029 96459 51 55 4038 97460 55 66 4009 98459 53 22 4029 99457 55 44 4009 100458 50 22 4025 101457 55 55 4009 102460 53 30 4034 103458 55 33 4015 104467 52 11 4035 105461 52 44 4031 106460 51 44 4030 107557 52 44 4020 108455 55 33 4020 109455 57 50 4009 110459 52 22 4031 111459 55 66 4009 112459 51 33 4033 113460 56 55 4017 114460 52 22 4034 115459 55 44 4019 116455 52 30 4032 117457 51 33 4032 118456 51 33 4018 119459 52 33 4037 120455 55 33 4009 121454 55 11 4042 122459 58 33 4009 123456 51 30 4041 Average load 52% Average throttling 34% Prime95 Benchmark Results: Intel(R) Pentium(R) 4 CPU 3.00GHz CPU speed: 4009.14 MHz CPU features: RDTSC, CMOV, PREFETCH, MMX, SSE, SSE2 L1 cache size: unknown L2 cache size: 1024 KB L1 cache line size: unknown L2 cache line size: 128 bytes TLBS: 64 Prime95 version 23.8, RdtscTiming=1 Best time for 384K FFT length: 10.206 ms. Best time for 448K FFT length: 12.443 ms. Best time for 512K FFT length: 13.979 ms. Best time for 640K FFT length: 16.765 ms. Best time for 768K FFT length: 20.182 ms. Best time for 896K FFT length: 24.361 ms. Best time for 1024K FFT length: 27.124 ms. Best time for 1280K FFT length: 36.160 ms. Best time for 1536K FFT length: 43.214 ms. Best time for 1792K FFT length: 52.054 ms. Best time for 2048K FFT length: 58.215 ms. Thanks, -Barry |
#4
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"baj2k" wrote in message...
First of all thanks for the thorough and very informative reply. No worries. :-) I've done some case baffling, dropped average case, CPU and PWM temps under Prime95 maximum torture settings by ~3c. While significant I'm assunig that's not enough. Not really. Other folks here may have different opinions of course but if that were my system I'd like to see the PWM temp significantly lower, and the CPU cooling improved enough to eliminate the throttling. but what is the maximum CPU and PWM temp's you'd be comfortable running. As I say, opinions may vary but I wouldn't be truly comfortable with the whole thing until the PWM temp was down below 55C or so under load. The CPU temperature is a slightly different case. Prescotts run hot, and there's very little you can do about that. However, you need to cool it sufficiently well enough that it doesn't throttle. If it does, there's very little point running it at the sort of speeds you are, as, if all it does is throttle whenever you use it, you're not actually getting the performance you should be, if you see what I mean. This thing ran in the high 60's C on Prime95 at stock 200MHz / 3.0GHz CPU speed. I'd say it gained ~ 8-10C at 267MHz. Yeah, this is the problem with these bloody things unfortunately. Fricking silly power consumption and heat dissipation before you even start overclocking. Here's the ThrottleWatch data @ 4.005GHz The first throttled data point was at CPU temp of 68c. No throlling seemed to occur until that temp. Indeed. What you then need to aim for is a situation where you can keep the CPU under this temperature, even under sustained and full utilisation. Max temp was 72.5C +/-5C on CPU and 71.5C +/-5C on PWM; temp fluctuates up and down quite a bit on the ABIT EQ monitoring app, but never exceeded ~ 77C. The throttling prevents the CPU from lunching itself by inserting increasing amounts of halt cycles once the temperature starts to reach danger level. This is a handy safety mechanism, but it also means that any gains you make from overclocking are going to be offset - and possibly even lost completely - if the throttling is severe. Average load 52% Average throttling 34% That's a significant statistic. I haven't done any in-depth testing with ThrottleWatch, primarily because my setup doesn't run hot enough to throttle, and thus don't know whether its readings pan out in reality. If they do, in effect it means that your 4.005GHz CPU turns into something like a 2.65GHz CPU whenever you try and do anything significant with it. If the ThrottleWatch results are correct, it also, significantly, means that you're getting less performance at 4GHz than you would at the CPU's default speeds - provided of course that CPU then ran cool enough to keep it under the throttle threshold. Prime95 Benchmark Results: As a matter of interest, have you tried running Prime at default CPU speed? It'd be interesting to see how the results compare, and whether the throttling is indeed impacting performance to the extent ThrottleWatch is suggesting. -- Richard Hopkins Cardiff, Wales, United Kingdom (replace nospam with pipex in reply address) The UK's leading technology reseller www.dabs.com |
#5
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"Richard Hopkins" wrote in
: As a matter of interest, have you tried running Prime at default CPU speed? It'd be interesting to see how the results compare, and whether the throttling is indeed impacting performance to the extent ThrottleWatch is suggesting. Here's the results, surprisingly no apparent difference when throttling up to 33%. Prime95 Benchmark results as requested: 200/66/33 Cold - No throttling - Before Prime95 Torture Test -------------------------------------------------- Intel(R) Pentium(R) 4 CPU 3.00GHz CPU speed: 3006.85 MHz CPU features: RDTSC, CMOV, PREFETCH, MMX, SSE, SSE2 L1 cache size: unknown L2 cache size: 1024 KB L1 cache line size: unknown L2 cache line size: 128 bytes TLBS: 64 Prime95 version 23.8, RdtscTiming=1 Best time for 384K FFT length: 13.515 ms. Best time for 448K FFT length: 16.461 ms. Best time for 512K FFT length: 18.552 ms. Best time for 640K FFT length: 22.104 ms. Best time for 768K FFT length: 26.584 ms. Best time for 896K FFT length: 32.062 ms. Best time for 1024K FFT length: 35.689 ms. Best time for 1280K FFT length: 47.582 ms. Best time for 1536K FFT length: 56.890 ms. Best time for 1792K FFT length: 68.379 ms. Best time for 2048K FFT length: 76.474 ms. Hot - No throttling - After 10 min Prime95 Torture Test ------------------------------------------------------- Intel(R) Pentium(R) 4 CPU 3.00GHz CPU speed: 3006.90 MHz CPU features: RDTSC, CMOV, PREFETCH, MMX, SSE, SSE2 L1 cache size: unknown L2 cache size: 1024 KB L1 cache line size: unknown L2 cache line size: 128 bytes TLBS: 64 Prime95 version 23.8, RdtscTiming=1 Best time for 384K FFT length: 13.522 ms. Best time for 448K FFT length: 16.417 ms. Best time for 512K FFT length: 18.537 ms. Best time for 640K FFT length: 22.084 ms. Best time for 768K FFT length: 26.578 ms. Best time for 896K FFT length: 32.110 ms. Best time for 1024K FFT length: 35.709 ms. Best time for 1280K FFT length: 47.621 ms. Best time for 1536K FFT length: 56.845 ms. Best time for 1792K FFT length: 68.380 ms. Best time for 2048K FFT length: 76.365 ms. 267/66/33 Cold - No throttling - Before Prime95 Torture Test -------------------------------------------------- Intel(R) Pentium(R) 4 CPU 3.00GHz CPU speed: 4009.11 MHz CPU features: RDTSC, CMOV, PREFETCH, MMX, SSE, SSE2 L1 cache size: unknown L2 cache size: 1024 KB L1 cache line size: unknown L2 cache line size: 128 bytes TLBS: 64 Prime95 version 23.8, RdtscTiming=1 Best time for 384K FFT length: 10.143 ms. Best time for 448K FFT length: 12.348 ms. Best time for 512K FFT length: 13.931 ms. Best time for 640K FFT length: 16.638 ms. Best time for 768K FFT length: 19.955 ms. Best time for 896K FFT length: 24.166 ms. Best time for 1024K FFT length: 26.890 ms. Best time for 1280K FFT length: 35.734 ms. Best time for 1536K FFT length: 42.728 ms. Best time for 1792K FFT length: 51.370 ms. Best time for 2048K FFT length: 57.345 ms. Hot - Constant, up to 33% throttling - After 10 min. Prime95 Torture Test ------------------------------------------------------------------------- Intel(R) Pentium(R) 4 CPU 3.00GHz CPU speed: 4009.11 MHz CPU features: RDTSC, CMOV, PREFETCH, MMX, SSE, SSE2 L1 cache size: unknown L2 cache size: 1024 KB L1 cache line size: unknown L2 cache line size: 128 bytes TLBS: 64 Prime95 version 23.8, RdtscTiming=1 Best time for 384K FFT length: 10.136 ms. Best time for 448K FFT length: 12.358 ms. Best time for 512K FFT length: 13.925 ms. Best time for 640K FFT length: 16.712 ms. Best time for 768K FFT length: 19.985 ms. Best time for 896K FFT length: 24.193 ms. Best time for 1024K FFT length: 27.678 ms. Best time for 1280K FFT length: 35.815 ms. Best time for 1536K FFT length: 42.793 ms. Best time for 1792K FFT length: 51.682 ms. Best time for 2048K FFT length: 57.333 ms. Your thoughts, perhaps Prime95 benchmarking is not a good test for this, maybe you could suggest another. Cheers, -Barry |
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