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| Is overclocking a CPU ok to do? |
| Yes |
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84% |
[ 27 ] |
| No |
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15% |
[ 5 ] |
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| Total Votes : 32 |
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bacterio
Joined: 04 Dec 2005
Posts: 242
Location: Getafe, Espaņa
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 Posted: Thu Mar 09, 2006 1:31 am Post subject: |
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I love overclocking computers.
I usually overclock my intel pentium4 prescott at 3'2Ghz(200x16) to 3'6Ghz(225x16) without problems, also my nvidia geforce4 mx440 agp4x at 270mhz to 320mhz and it's ddr memory to 550Mhz (originaly at 400).
I also like to overclock old computers (becuase they're easy to do), like my intel pentium 200Mhz(66x3)(no mmx) running at the speed of 262.5(75x3'5) with it's 3dfx voodoo3 2000 PCI running at a higher speed(don't know now), or my old intel 486dx33 running at 50Mhz
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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JAC
Joined: 24 Jul 2005
Posts: 3469
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| Posted: Thu Mar 09, 2006 5:05 am Post subject: |
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| yeah I do it all the time. first discovered it by accident when I used the wrong jumper settings with a 486 sx33. ~ 1993 I think. I still have the board, I ought to dust it off and fire it up again to see what I did. There might be somehting in that.. retro board challenge. See how much you can overclock ( stable ) on motherboards built before 1995. |
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chipcollector
Joined: 28 Sep 2004
Posts: 1681
Location: New England
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| Posted: Thu Mar 09, 2006 3:13 pm Post subject: |
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I overclocked three different 3.6GHz P4's (560J, 561 ES, 660) all to 4.2GHz and higher, stable. Highest suicide run was 4.55GHz. 
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CPUShack
Joined: 16 Jun 2003
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bacterio
Joined: 04 Dec 2005
Posts: 242
Location: Getafe, Espaņa
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| Posted: Thu Mar 09, 2006 4:15 pm Post subject: |
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wow beat the speed
the max mhz I got was 3872(242x16) with my prescott
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chipcollector
Joined: 28 Sep 2004
Posts: 1681
Location: New England
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| Posted: Thu Mar 09, 2006 4:19 pm Post subject: |
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| CPUShack wrote: | | 4.55GHz is so freakin cool lol |
scary as hell, too my computer turned off a number of times right after a suicide run, and didnt turn on for hours 
| bacterio wrote: | wow beat the speed
the max mhz I got was 3872(242x16) with my prescott |
672MHz overclock isn't bad at all. You know what else you can do to get higher performance? Lower the multiplier to 15 and overclock as much as you can. That way you'll get higher FSB for the videocard to pump out as much power as it can. It may not work on your 3.2, I think it was made for 3.4 and up.
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sammyc
Joined: 09 Dec 2005
Posts: 1668
Location: Scottish Borders
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| Posted: Thu Mar 09, 2006 4:31 pm Post subject: |
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I stopped overclocking at DX4-100 lmao
I had a intel DX4-100 running at 125 i think... hmm?
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Thu Mar 09, 2006 4:52 pm Post subject: |
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The poll is a leading question - is it OK or not - depends on what you have the processor for.
I overclock the Sempron 2600+ (normal 1600, actual = 1800 and sometimes higher). For a working processor, I think overclocking is fine, in fact it's more than that - it's a money saving feature of many processors
For a processor that I consider collectible, I would NEVER overclock, as it CAN (note that I say CAN, and not DOES, as it doesn't always...) shorten the life of a processor. I'd be gutted if I spent good money on a processor for my collection then killed it when searching for a little speed
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Hippo
Joined: 01 Feb 2006
Posts: 377
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| Posted: Thu Mar 09, 2006 6:29 pm Post subject: |
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| chipcollector wrote: | | That way you'll get higher FSB for the videocard to pump out as much power as it can. It may not work on your 3.2, I think it was made for 3.4 and up. |
That bit is purely wrong. When overclocking you want the PCI and AGP/PCI-E busses to remain at there standard speeds so that you dont get any errors. Running most cards at a high bus speed can and will cause timing errors etc.
Yes your right about the multiplier, lower the multiplier and raise the FSB. You get a better performance boost with a higher FSB. For instance 200 x 10 will be faster than 166 x 12. Always try and get the best ram you can afford with high bandwidth for the high FSB clocks.
Dont forget if it isnt stable at a higher FSB try slackening the Ram timings and increasing the CPU Vcore and the Ram supply voltage.
Use Prime95 and memcheck to test for system stability after an overclock and use Super PI as a nice quick numbercrunching performance tester
I once had a Duron 1800 converted to a Athlon XP by re-enabling the extra L2 cache and overclocked it to 2.2Ghz (and I've got the screenies to prove it). I dont overclock much now as I have a A64 Shuttle and things can get a little toasty in there
My first overclock was an Intel 486 DX-2 66 to 80, a whole extra 14Mhz, w00t  
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chipcollector
Joined: 28 Sep 2004
Posts: 1681
Location: New England
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| Posted: Thu Mar 09, 2006 7:07 pm Post subject: |
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| Hippo wrote: | | chipcollector wrote: | | That way you'll get higher FSB for the videocard to pump out as much power as it can. It may not work on your 3.2, I think it was made for 3.4 and up. |
That bit is purely wrong. |
What's wrong about it? If you know anything about gaming, the first thing you'd recognize is the videocard bottleneck. It's when you have the videocard pumping information at speeds faster than the cpu can move. Basically you dont get the most out of your card so you either overclock to get a higher CPU FSB, or you lower the multiplier THEN overclock so you'd get more per MHz.
All the speed is on a CPU is basically the FSB pumped a certain number of times- whether it's double pumped, quad pumped or whatever it may be. Put simply, you want the lowest possible multiplier with the fastest possible speeds to get the most out of your CPU. The task is to squeeze that 1GHz memory speed of the videocard through the 800MHz FSB of that Pentium 4. By overclocking, you loosen the bottleneck and get more performance from that P4.
Also just for the record, I know all about the voltages (northbridge + ram) and the means of testing (Prime95, AC3 and other benchmarks), or else how would I get to 4.23GHz stable?
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Hippo
Joined: 01 Feb 2006
Posts: 377
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| Posted: Fri Mar 10, 2006 3:19 am Post subject: |
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If you know anything about stable overclocking then one major rule is to keep the PCI/AGP bus 'locked'. Otherwise you can be driving your video card and other peripheral cards with a bus speed too high causing problems and lock ups.
From a history point of view this caused problems years ago with 486- 40 and 50Mhz none clock doubled. Sometimes the VLB cards couldnt run as fast as this and caused crashes and lockups.
If you want your video card to go faster then overclock it. Use tools/software available to increase the GPU core and memory speeds.
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bacterio
Joined: 04 Dec 2005
Posts: 242
Location: Getafe, Espaņa
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| Posted: Fri Mar 10, 2006 8:19 am Post subject: |
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The problem I have is that I cannot change the multiplier because it's locked to 16 (i hate those processors who have the multiplier locked  )
I remember also that VLbus cards were very problematic, for example i have an intel 486dx50 with a motherboard supporting 2 VLB expanson slots, but i'm only capable of using one of them with a 50 mhz fsb(i wasn't able to use a cirrus logic GD5428 and a E-IDE controller at the same time), and if I want to use two VLB cards at the same time, i have to raise the fsb to 33. |
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chipcollector
Joined: 28 Sep 2004
Posts: 1681
Location: New England
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| Posted: Fri Mar 10, 2006 5:21 pm Post subject: |
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| Hippo wrote: | If you know anything about stable overclocking then one major rule is to keep the PCI/AGP bus 'locked'. Otherwise you can be driving your video card and other peripheral cards with a bus speed too high causing problems and lock ups.
From a history point of view this caused problems years ago with 486- 40 and 50Mhz none clock doubled. Sometimes the VLB cards couldnt run as fast as this and caused crashes and lockups.
If you want your video card to go faster then overclock it. Use tools/software available to increase the GPU core and memory speeds. |
What are you TALKING about? I never said ANYTHING about touching the PCI/AGP bus! Infact, changing their settings would damage your entire system. I don't know why 486's would be overclocked through the PCI/AGP bus but it's not done that way anymore.
There's always a bottleneck going on, whether it's the CPU being stronger than the videocard, or the videocard being stronger than the CPU. In the first case, you'd raise the CPU FSB to equalize power, thus loosening the bottleneck. In the second case, you'd overclock your videocard to get more data sent through, squeezing out as much power from the videocard as possible.
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Hippo
Joined: 01 Feb 2006
Posts: 377
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| Posted: Fri Mar 10, 2006 6:12 pm Post subject: |
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| chipcollector wrote: |
What are you TALKING about? I never said ANYTHING about touching the PCI/AGP bus! |
What about here?
| chipcollector wrote: | | 672MHz overclock isn't bad at all. You know what else you can do to get higher performance? Lower the multiplier to 15 and overclock as much as you can. That way you'll get higher FSB for the videocard to pump out as much power as it can. It may not work on your 3.2, I think it was made for 3.4 and up. |
| chipcollector wrote: | | In the second case, you'd overclock your videocard to get more data sent through, |
Being pedantic, but when overclocking your GPU you'ed actually get more data processed for the same time scale, it wouldnt magically 'send more data' across a fixed speed bus.
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