Overclocking Athlon XP 2800+ Cpu voltage question

I have overclocked my AMD Athlon XP 2800+ to a 3000+ pretty easy. I just went in and changed the front side bus from 166 to 173.

My question is, my current cpu voltage is 1.676. I read in the overclocking faq to not go higher than 1.8 for AMD processors. My BIOS let's me bump this up by 5% or 10% if I need to. That would put me to 1.76 or 1.84. Because of what I read I probably will stay away from the 10% bump.

However, since my machine is running stable should i just leave it at 1.676, i'm assuming I should. However, in the future let's say I wanted to bump the FSB up to 176 - 180, then should I changed the voltage to 1.76?

Also, what would happen if I set the FSB on the motherboard jumper to 200? Would it ruin the chip, or just not boot up? Is there any difference between putting the jumper on 200 vs changing the FSB in the bios to 200 if the jumper is on 166?

Yes newbie questions sorry.

<i> If your computer is your best friend, maybe you should rethink your life.</i> :wink:
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More about overclocking athlon 2800 voltage question
  1. as long as u think ur system is stable, y increase voltage. And for ur 200 speed: try it. worst case u'll have a fired component :tongue: ....err...just wont boot. And then if need be increase the voltage.

    <i> :evil: <font color=blue>Futile is resistance,</font color=blue><font color=red> assimilate you we will.</font color=red> :evil: </i>
    <b>Hard work has a future payoff. Laziness pays off now.</b>
  2. Ok, you confused me :-)

    "as long as u think ur system is stable, y increase voltage"

    Are you saying it's a good idea for me to increase it now, if I have it overclocked to an AMD Athlon XP 3000+(fsb at 173) and everything is stable?

    If that is true, why? Does that help the processor in some way? Also, when you bump up the voltage, does it usually raise the heat a few degrees?

    <i> If your computer is your best friend, maybe you should rethink your life.</i> :wink:
  3. no i meant that currently u say ur system is stable. right ?

    If it is, no need to increase voltage.

    But if u plan to OC more to 200, and after that if u sys bcosm unstable, then try increasing voltage.

    <i> :evil: <font color=blue>Futile is resistance,</font color=blue><font color=red> assimilate you we will.</font color=red> :evil: </i>
    <b>Hard work has a future payoff. Laziness pays off now.</b>
  4. I'm, almost :wink: , sure that you can't burn the CPU just by raising the Mhz(within reason), it just wont boot if it's set too high. In order for it to boot and run stable at higher Mhz, you need to raise the voltage, and that's where most of the problems/risk come from.

    So as long as it is stable, there is no need for raising voltage. If you plan to OC more and the CPU becomes unstable, then, and only then, should you raise the voltage.

    <font color=blue>The day <font color=green>Microsoft</font color=green> will make something that doesn't suck is the day they'll start making vacuum cleaners.</font color=blue>
  5. Sort of sounds like you have a Gigabyte motherboard? Anyways on my board 10% puts you right at the 1.80 volt "limit." Setting it at 10%, it should keep it right at 1.8 volts, and shouldn't go past it.

    Anyways, if you keep uping your FSB you will have to increase your voltage to remain stable. Leave the voltage as low as you can, as more voltage equals more heat.

    Personally my 2800+ overclocks pretty well. In hot enviroments, mine runs 2500 mhz, at 1.8 volts and is stable. This 2500 mhz (Well past your 3000+ figure) is achieved with a 200 mhz FSB. Now that I am in a little cooler enviroment (the basement), my 2800+ now runs stable at 2600 mhz. This is all on air cooling.

    Set your VCore to +10% and check your voltages I think you will find your VCore doesn't go past the 1.80 volts. Then keep working your way up on the FSB.

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  6. Yes I have a Gigabyte board. Actually when you up the front side bus that much, I noticed that I can do 7.5%, that puts it at 1.8 volts. 10% would put it at 1.84.

    I tried putting the FSB at 200 and 1.8 volts through the bios and it didn't boot. Maybe i'll try the jumper instead.

    <i> If your computer is your best friend, maybe you should rethink your life.</i> :wink:
  7. Huh, thats strange, on the last three Gigabyte boards I have had the 10% setting sits right at 1.8, the 7.5% setting sits right about 1.74-1.76.

    Which GigaByte board do you have, and what are your temps? I currently have a 2800+, and mine doesn't mind being at the FSB 200 at all.

    Whats this jumper you are talking about? You're not talking about those dip switches are you?

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  8. I would suggest checking out the overclocking forums for these sorts of questions.

    There are many factors which will influence how well you can overclock, but the main ones are:
    Which motherboard you have (or more specifically, which Chipset it uses - nforce2=good, VIA/SIS=Not so good);
    Whether your CPU has an unlocked multiplier;
    How good your cooling is;

    I would <b><font color=red>NOT</font color=red></b> recommend running at 1.8V without <i>excellent</i> third-party air-cooling at least. Vcore has a much greater effect on temperatures than Mhz alone, and you're going to have a toasty chip @ 1.8V.

    ---
    Epox 8RDA+ V1.1 w/ Custom NB HS
    XP1700+ @200x10 (~2Ghz), 1.4 Vcore
    2x256Mb Corsair PC3200LL/1x512Mb Corsair XMS PC4000 2.5-3-3-7
    Sapphire 9800Pro (VGA Silencer Rev3) @418/742
  9. I did this using a calculator not a real life test. Mine sits at 1.676 normally.

    so I just assumed this based on math

    1.676 * 1.05 = 1.7598
    1.676 * 1.075 = 1.8017
    1.676 * 1.1 = 1.8436

    I have the Gigabyte GA-7VT600 1394 Motherboard. When it's stock the temperature is running about 45 degrees, when overclocked to a 3000+ (fsb @ 173), then it's runs about 47-48 degrees.

    and yes i'm talking about the switches on the motherboard, where you can tell it the default fsb speed.

    <i> If your computer is your best friend, maybe you should rethink your life.</i> :wink:
  10. You shouldn't have to mess with those switches, I have never used them.

    Your temps look pretty good, and should not be causing you a problem.

    I sat with my settings at 7.5% on the VCore for a while. I did the same math you did, and determined that the 10% would put me over 1.8. However I eventually said screw it and turned it up to 10%, the board never goes above 1.8. My last three boards have been like this. Most likely you will be ok at 10%, turn it up to 10% then watch your temps.

    The extra voltage may make your chip stable at higher speeds.

    As mentioned above, and good heatsink is recommended.

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  11. Boy now this is wierd. I went ahead bumped up the voltage by 10% and changed the FSB to 180 in the bios.

    That puts me at 2250 Mhz :-) But???? The cpu voltage is only registering as 1.756 in EasyTune4. It was registering as 1.676 before, odd.

    So far i've opened and closed IE a bunch of times, opened up Quicken 2004 and closed it and a few other things. I'm writing this with it OC'd that much. Everything seems stable so far and the CPU is running at 51 degrees and the system at 36 degrees right now.

    So far 180 fsb seems pretty safe. I'll try more later, i'll run with it this way for the rest of the night another 3 hours and see if it crashes at all.<P ID="edit"><FONT SIZE=-1><EM>Edited by jflongo on 09/07/04 07:06 PM.</EM></FONT></P>
  12. Download prime95. If it doesn't make you system crash after a couple of hours, you can say you're stable. Get mbm5 as well, and keep an eye on the temps.
    If you want to run OCed, spend a few dollars to get a better hsf, the vantec aeroflow is cheap, and good.
    If you are running OCed, it's a good idea to clean your hsf, once every month or two. A vacuum with a plastic noozle is fine (power switch turned off), or if you have blow function, that works well, but is messy.
  13. That is strange that it only upped the voltage to 1.756, is it fluctuating at all? Mine sits at a pretty solid 1.8 while at 10%, sometimes it drops to 1.78 for a split second or so, but goes right back up.

    You aren't using EasyTune4 to overclock are you? The BIOS settings are far superior to that program. EasyTune just tends to cause problems when I have used it in the past. Ctrl-F1 once inside the BIOS, will open up new advanced settings, if you hit this on the main screen, then go under the menus you will notice they have changed.

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  14. i'll look into downloading those thanks. So far everything has been stable with browsing and such. I even ran a tool that monitors one of our applications servers, it takes all the CPU for about 45 seconds while it's coming up and shot my processor from 50 degrees to 55 degrees, but once up it settled back down to 51 degress while i was using it.

    In fact, while browsing and typing this, it's settled back down to 48 - 49 degrees.

    As far as cleaning my machine. I can take it out to my driveway, put my air compressor on 20psi and just blow everything out with air.
  15. I'll reboot my computer in about and hour and try the Ctrl-F1. It's not fluctuating at all, it's just sitting solid at 1.756 using EastyTune4 to watch.

    I'm not using EasyTune4 to overclock. I'm just using it to check the settings and temperature.

    <i> If your computer is your best friend, maybe you should rethink your life.</i> :wink:
  16. There is a nice System Temp program that came with a Giga-Byte motherboard several years ago, it doesn't come with them anymore, but works great. I prefer it over EasyTune for monitoring and such (It just plain and straight foward).

    If you private message me your email address, I can send it to you, its 300 KB.

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  17. I think I remember that tool as well, I may have it on CD.

    NOW I HAVE A PROBLEM!!!!!!!!!!

    The memory I have in my machine is the Corsair XMS PC3200 512MB 2-3-3-6 memory. I have 2 sticks of it. I downloaded CPU-Z and looked at my memory and the latency was set to 3. So the default settings were 3-3-3-8. I went into the advance bios settings and changed that to 2, and changed the rest of the settings so that it was 2-3-3-6.

    <A HREF="http://img30.exs.cx/img30/8797/myCPU-Zmemory1.jpg" target="_new">http://img30.exs.cx/img30/8797/myCPU-Zmemory1.jpg</A>

    At that point my machine wouldn't boot up, and reset itself to 166.9 FSB.

    So basically my memory is set at the settings it should be, but then I can't clock that high, does that mean i need to up the dram voltage as well?

    ******** Edit *********
    I tried upping the dram voltage by 0.1, 0.2, and 0.3 all the avaiable ones, it didn't help. So I set the DRAM back to Auto for configuration, which puts it back to 3-3-3-8 and i can set the fsb back to 180 fine.<P ID="edit"><FONT SIZE=-1><EM>Edited by jflongo on 09/07/04 09:54 PM.</EM></FONT></P>
  18. Normally when you increase the FSB you memory timings will go up. When overclocked you may be forced to run slower memory timings.

    If you read this you won't worry about the RAM timings as much anymore:

    <A HREF="http://www.tomshardware.com/motherboard/20040119/index.html" target="_new">http://www.tomshardware.com/motherboard/20040119/index.html</A>

    In newer systems memory timings don't really help you much at all. You will make much bigger gains with the increased FSB, vs the lower timings.


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  19. Ok, i'll give that a good read tomorrow, thanks.

    So far my machine is running with auto on the memory settings now and the front side bus is bumped up to 181 Mhz.

    That puts me at 2262.1 Mhz, so far stable. I'll try that prime95 program tomorrow night with the 181 fsb setting.

    <i> If your computer is your best friend, maybe you should rethink your life.</i> :wink:
  20. How long are you running Prime95? Honestly when I am overclocking a new system, I don't bother running Prime95 or anything similar for a couple of hours. I know this is the only way to know for sure, but generally I just run a few benchmarks.

    After each step in overclocking, I run PCMark02, 3DMark03, AquaMark3, and sometimes 3DMark01 as well. Generally if my system is unstable it will crash during one of these tests. If it passes all of them, your odds are pretty high that you are still stable. Generally after I get what I think is the max overclock, then I run an extended test, generally loop somesort of CPU benchmark to keep the CPU at 100% load, and watch the temps. If nothing funny happens I leave it.

    In my expeierence if my system can run the benchmarks, its stable. Running PCMark02 (No HD test) and AquaMark3, would probably save you time, then run the extended tests after you get your "max overclock."

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  21. I haven't tried prime95 yet. I just ran my machine for about 3 hours or so and opened and closed programs. Like I mentioned earlier, I opened up a monitoring tool that I use at work and that pegged my CPU for 30 - 45 seconds, raised the temp from about 50 degrees to 55 degrees during that time, but all was stable. I also opened up about 45 IE Browers at once and no problems with that either.

    As far as all of those tests that you mentioned. Will they all work with my ATI Radeon 7500 video card?

    And as far as max oc'ing goes for my machine, i have a feeling it's going to be somewhere around 183ish, that would put me at 2287.5 Mhz. I wish it would go higher, but i'm still going to be happy. I will probably attempt 184 tonight, but 185 definitely didn't work for me last night. So that's why i'm thinking 183 may be it.

    I basically got an AWESOME deal on this 2800+ awhile back. A store in my area had a 2800+ Retail bundled with a Cheap ECS Mobo retail for only $99!!. I bought that and then sold the mobo for $30. So I basically got this processor for about $77 if you include tax.

    If AMD would have kept making 333fsb barton processors past the 3000+, i'm guessing mine would be comparable between a 3200+ and 3400+ for only $77 ;-)

    ***** Edit *****
    I just read that article on memory timings thanks. Now i'm mad at myself a little for buying the Corsair XMS 2-3-3-6 memory. I should have just bought the value select probably and saved $40 / 512MB stick. Another question about memory and the gigabyte board. Have you tried setting the memory from normal --> fast --> ultra while everything is overclocked? What does that do exactly?<P ID="edit"><FONT SIZE=-1><EM>Edited by jflongo on 09/08/04 08:21 AM.</EM></FONT></P>
  22. Thats a killer deal for that 2800+.

    Those different settings normally play with the memory timings. You can try them, but they haven't worked for me in the past. Of course I also just have the low-end Mushkin RAM, which doesn't seem to like latencies below 2.5. As you have pretty good RAM it may be worth a try.

    3DMark03 won't work that well with your 7500, it will only run the first test. However 3DMark01 would work great on your card. AquaMark3, is questionable. PCMark, is just got CPU and RAM, so it will obvisuly run. You could also use any of the many free programs just to stress the RAM and CPU. PCWizard04 is a good free program. SiSoftware Sandra is also pretty good.

    If you could get your temps down a little you may be able to go farther. Maybe lapping your heatsink and some Artic Silver5 would be worth a try?


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