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I want 2.8Ghz+!

post #1 of 7
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Right my 3800+ Venice (single core) is currently overclocked to 2.7Ghz and all is stable. Now i want to go higher than this like all us OC'ers do.

Currently using 11 (Multi)x 246 (FSB) and HT x4 with all voltages on Auto.
USB Legacy Support DISABLED
PCI-E Freq 100Mhz
PCI Freq 33.33Mhz

For the record it seems unstable if i raise the FSB higher than 250 using the 11 multi, but oddly it runs as high as 280 with a multi of 10. Now i am using 2x1024Mb Consair Value Ram & i didn't think i could get such a high FSB regardless of what Multi i used (i new to OC'ing so....)

The problems i seem to be getting is things like halts in windows i.e during bootup, after logging in or running Super PI 1Mb tests. Plus when i lower my divider to say 266Mhz or 200Mhz my ram is running at a rather lower than stock freq, which is understandable when i use a divider and pushing the FSB up will increase the memory towards and past stock freq. But, it seems i'd have to achieve CPU freq of around 2.9Ghz + to get the ram near stock speeds using these dividers.

Is this a power issue to the CPU etc or could halts of this kind be something else?

Also what is the stock Voltage for Corsair Value Ram?
 
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post #2 of 7
Accually if you run the CPU at a lower multi by have a higher FSB, it should be better then the higher multi.
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post #3 of 7
Using lower multis. with higher fsb will cause you to also increase your RAM frequency, which you may not want to do since you have Value RAM. In my experience Value RAM of any brand usualy caps out at 220MHz if you're lucky, so if you decide to use low multis. you may have to use some really big dividers. However, at the end of the day, the thing that matters most is CPU speed; a higher fsb may give you better scores in benchies but won't result in a drastic difference in real life situations.
Try 255MHz x 11 with a 333MHz divider (5:6) and a HT multi. of x3, with a 0.05V bumb on the vcore to start with. Run SuperPi 1M for a quick test of stability; if it passes run Prime, if not try upping the vcore a bit (I would not go over 1.55V).
Stock voltages for your particular RAM I think are 2.6-2.7V, and I would not try to go any higher. Keep in mind that timmings play a very crucial part when overclocking A64s so you may have to tweak them a little (specially if running Value RAM at higher frequencies than stock).
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post #4 of 7
2.7G @ default vcore, that is great... like said, up the vcore and see where it goes. Keep the full load temp @ or below 50c!
    
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post #5 of 7
Quote:
Originally Posted by The Duke View Post
2.7G @ default vcore, that is great... like said, up the vcore and see where it goes. Keep the full load temp @ or below 50c!
Indeed. If you can hit 2.7 @ default voltage, you should, more than likely, hit 2.8 with an increased Vcore.

Also, if you try the advice from a bove, and drop the multi and raise your HTT, make sure you change your memory divider so that you don't introduce instability from clocking the memory too high. It's good to play with multi/htt changes, just make sure you keep the memory as stable as possible while doing so.
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post #6 of 7
I usually drop my HT down to 3x and raise the Vcore if I have any issues.
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post #7 of 7
Keep your ddr and htt initially low, Like I have my HTT from 1ghz to 800 and ddr (pc3200) at 166. Do this with the mulitpliers or if you can manually set the valuves like me. Lock PCI(e) and AGP buses.

From there thet htt (800) and ddr(166) will be raised above THOSE as you turn up the baseclock. My athlon 4000 90nm san diego (much like your maybe if its 90nm) overclocks to 3.0 from 2.4. This would be at a base clock of 250. With a base clock of 250 then, my ddr is back up to 200mhz and my htt is backup to 1.0.

Doing stuff like this can allow you to overclock your cpu while everything else stays locked or underclocked and then will raise up to more respectable levels as you increase the baseclock for the cpu.
    
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