Socket 754 Sempron 3100+ Overclocking *large image warning*

TomL

TomL

TomL

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hey im trying to overclock my socket 754 sempron 3100+, a possibly fruitless endevour but regardless i have stumbled upon a problem:

when increasing the FSB by 5MHz the ram speed obviously is going up but i cant get it back down to its original speed, heres a picture.

cmosconfighe1.gif
 
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as your put the cpu fsb up the ddr speed will also go up. sometime this is fine and your memory cn handle it.

what you can do is change the cpu/ddr clock ration this will change the fsb of the memory but there are only nomrally 3 or 4 settings. you just have to find the best settings,
 
Your RAM is already running slower than the standard DDR400, it's at DDR340 as can be seen.

the CPU / DDR Clock Ratio option is what you should use to adjust your RAM speed. The ratio of 2/2 will bring your RAM back up to normal speed, in this case 205Mhz (DDR410).
 
interesting, well thanks for that information.

it isnt running at that though, it would be if i saved the settings, but as you can see from the picture its default is 333MHz
 
Ive brung the HT multiplier down to 3 from 4, and changed the RAM devider to 2/1.33, this brings the RAM down to its original speed at the default FSB which is 333MHz... everything seems stable, the cpus operating quite a bit hotter now though
 
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I tried setting the RAM divider to 2/2 but PC wouldn't soft reboot from BIOS, I'd be forced to reset it manually and the RAM divider would've defaulted back to its original setting. Now I've got the RAM divider operating below its default setting, and the HT multiplier as well, advice?
 
Just noticed I'm receiving a sort of electronic interfearance noise through my headset when a lot of SFX are coming from WoW, this almost definitely has something to do with the overclock, as im using a PCI sound card. :/
 
I ran SP2004 for 9 hours and picked up no errors, what do you reckon to a 3100+ sempron at 47c average under load?
 
What is the RAM that you are using?? I assume it's a DDR333 since that's what your BIOS defaults to. That will explain why you will have problems running 2/2 cuz that will oc your RAM to DDR400 to match the default FSB of 200Mhz.

Do you have any lower divider sittings?? 2/1 for example?? Because that is what you need in order to oc your sempy further without stressing the RAM.

Although TBH I don't see why you can't OC your RAM to DDR400 speed, have you tried loosening your timings and increasing voltage?? try these and see if you can run 2/2 divider, but remember to back your CPU down to stock first otherwise you will be running your ram @ 250Mhz (DDR500)!

The temp seems right for a 0.13um CPU @ 1.42V, although I'm not sure cuz I've never used a 754 sempy.
 
I increased the FSB and changed the RAM divider so the RAM speed came to 400MHz, I think I lowered the HT multiplier to x3 aswell. When I booted up it went through the detecting IDE drives etc, then came to this screen which I thought was really bizzare.

dsc00031xw2.jpg
 
I'll just leave it at 250mhz fsb and 2/1.33 ram divider, everything else is at default. maybe i just need to increase voltage to either cpu or ram to make it work, dunno.
 
I have a nasty feeling judging by the symptoms of graphical corruption and sound corruption that you may be overclocking your pci bus.
Check the bios for any setting referring to the pci speed or pci lock.

Your bios even tells you the calculated ddr speed with the divider, so raise the fsb up in small increments, say 5, and each time adjust the ddr ratio so that the calculated ddr speed underneath it is less than 333. Keep the ht at 4 unless you exceed 250fsb. After you have raised the fsb each time boot up and run sp2004 for one iteration with small fft's. Check temperatures each time.
When sp2004 fails go back to the bios and either increase the voltage or reduce the fsb a little and stress test again and leave it. Once you have finished do a long stress test to make sure its stable.

Btw there is an edit button at the bottom right hand corner of your posts that you can use to update them.
 
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I need to keep posting, else the thread falls off the first page and no one sees it ><

But I will heed your advice!
 
So I increased the RAM divider to 2:2, left the FSB on default (200MHz), and increased the RAM voltage by +0.1v, which has equated to a successful boot into Windows. Without the voltage increase the PC would not soft reboot after saving the settings in BIOS.

What can I do now, reduce the RAM divider and increase the FSB untill the RAM speed is as close to 400MHz as possible? Or does it have to be dead on 400MHz?

In regards to PCI clock speed, I found only this - which I have disabled, to no discernable effect:
dsc00037ot8.gif


In response to steve
have you tried loosening your timings
Click to expand...
I don't know how :( . Is it something to do with these:
dsc00038rz2.gif

???

nearly an hour later: playing Eve Online with x2 clients running, suddenly without warning the display signal from my graphics card to the monitor dissapears (happened before but only on initial bootup which required me to reseat the RAM). I knew it was just the signal that went because my music n everything was still going - this has not happened in windows before, and resetting the machine sorted it out..
 
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I'd really appreciate some feedback from someone familiar with overclocking on a A64 SKT754 GA-K8NS mobo.

I'm concerned whether or not the RAM and FSB speed have to be a specific or even number. I've just booted up on 241FSB on a RAM divider of 2/1.66, giving 400MHz RAM speed. I'll be leaving SP2004 running over night and see how it goes. Screenshot of relevant information enclosed:


info4ocersxp0.gif



One last thing, I don't think SpeedFan is reporting the correct temps. The BIOS CPU temp is around 30c idle whereas SpeedFan reports around 25c idle, so chances are the CPU is atleast 5 degrees hotter than what SpeedFan is saying it is :/

ANOTHER THING (can't sleep), shall I assume 0.13um means 130nm? If so my chip really is quite outdated, makes me believe my upgrade will be even more justified.. mMMmMmM 65nm goodness.
 
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From the CPU-Z screenshot you can see that your RAM has default timings of 3/3/3/8 at stock DDR400 PC3200 speed, but at the moment you are stressing it to 2.5/3/3/8.

To loosen your timings switch the tcl / tras / trcd / trp to 3/8/4/4 leave the rest of the timings as it is or set them to auto if you can. Leave the voltage at +0.1V, as it is a Micron generic RAM I wouldn't go over +0.2V (2.85V).

Do all the above then try rasing your FSB to 250Mhz with the divider at 2:1.66 again, so the RAM is running 208Mhz. I'm pretty sure it will be stable.

Try downloading Core Temp it is the most accurate temp monitoring program atm.

And yes it is 130nm.
 
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Cas 3
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^ just as a lil test set your ram timings to that and have another go.. its probably looser than it needs to be but i find it so much easier to leave ram until last when it comes to overclocking and tightening up the timings again..

semprons tend to be pretty neat overclockers.. sounds like motherboard is holding you back a bit there..

sorry didn't really have time to read the thread but have you locked pci at 33mhz and not "to cpu".. also lock agp or pci-e to 66mhz or 100mhz respectively.

also - its probably not necessary but my chip needed a hell of a lot'a volts to get stable.. try pumping yours up to 1.5v and having another go..

Best of luck.. post results :D

Alec
 
Okay so here's how things look now:
cpuz141206yw4.gif
cpuz1412062af9.gif


Haven't stress tested the current settings in SP2004 yet, but I successfully ran it for 12 hours on the previous settings with no errors:
stable12hrsse2.gif
 
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