overclocking and voltages

sureshkhirwadka

sureshkhirwadka

sureshkhirwadka

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4 Jan 2005
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105
Hi guys, I'm fairly new to overclocking and want to O/C my CPU. Currently my setup is

Athlon 64 3000+
Abit AV8 3rd eye s939
1024 mb PC 4000 DDR RAM (unkown manufacturer)
Corsair water cooling for CPU

Basically, I want to O/C my CPU to its full potential, I'd hope for somewhere around a 3600+ speed or more, but I don't really know about upping voltages etc, when to do it, which voltages to up, and how much by - any help would be appreciated!

Oh yeah, current results so far are:
FSB 210, multiplier x9 (1890mhz) no voltage change
FSB 215, multiplier x8.5 (1827.5 mhz) no voltage change
FSB 220, multiplier x8.5 (1870 mhz) CPU voltage 1.45v

Thats about all I can seem to get without changing other voltages, or upping CPU even more.

Can anyone help me please?
 
You shouldn't need to change the cpu multiplier at all.

First, lower the htt multi to 4 to keep the ht below 1000mhz, and enable a ram divider to keep ram below 200mhz. Make sure you have any pci or pci-e options set to locked so they don't follow the fsb.

Then raise the fsb until it fails prime95, then raise the cpu vcore a tiny bit, check it now passes prime, and continue to raise the fsb. Lower the htt multi to 3 when the fsb goes over 250 to keep it below 1000mhz and lower the ram to 166 to keep it below 200mhz.

The way that the ram divider is handled varies between boards and i haven't uses an abit bios before, if you can let me know what options you have to enabling a ram divider and lowering the ram speed, so i canbe more specific.

When the voltage gets too high (>1,55) or the cpu temps get too high (> 55) you have reached the cpu's potential. Then you can overclock the ram if you wish.
 
hp7909 said:
What's that??? :confused:
Click to expand...
He means 3600+ speeds, which if that part existed would be 2.2 with 1mb cache.

The 3000+ has 512k of cache, so overclocking it to 2.0 makes it a 3200+, 2.2 makes it a 3500+ and 2.4 would make it a 3800+ etc.
 
following your guide Joe my amd athlon 3200+ is now overclocked to 2.55 ghz and stable, I had it on the 5x multiplier so I put it down to 3 and got a 200mhz boost :cool:
 
yeah, i meant 3500+ sorry. Anyway, as far as BIOS options goes, it seems fairly limited (which is surprising considering its supposed to be a good overclocker!?). There doesn't seem to be an option to change HTT multipliers, and I can't seem to unlock the memory frequency either, only the timings.
 
I think abit call it ldt.
There must be some memory speed options somewhere, there may be an 'automatic/manual' option to make them show up or something.
 
Im speaking from my Abit AN8 bios but i reckon they should be similar.

Inside in "Advanced Chipset Features" you should find "HT Frequency"
Thats the HTT multplier... set it down to 4x from 5x
4x should be enough until you reach an FSB of 250mhz

Under those is "DRAM Configuration"
In their set "Dram Timing Selectable" to Manual, and Set the "DRAM Clock" down from DDR-400 to DDR-333 for starters.

You'll also want to disable "Cool'n'Quiet Technology" under the "Power Management Setup"

Personally, with my 3000+ Venice with PC 3200 ram, im getting 2610mhz with 9x multiplier on 290 FSB with the ram at 190mhz (DDR-266) and a 1.45v Cpu core.
The motherboard has more FSB still but the cpu is holding it back, so i dont see why another Abit motherboard of the same period would clock so much worse.
 
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ok, so i was being stupid, I just didn't see the options. HTT is under "LDT", and the DRAM clock thing was confusing me, I've got it sorted now. Just successfully loaded up windows at 230FSB x 8.5, HTTx4, DDR@333.

My next question is, how can I tell what speeds the DDR is actually running at, as it doesn't tell me actual speeds of the memory, it just says DDR 333. Is there some complication calculation between FSB and DDR speed? e.g FSB x 2 /(400/333)? which would make about 382.5mhz at the moment with the above speeds?
 
ok, so i was being stupid, I just didn't see the options. HTT is under "LDT", and the DRAM clock thing was confusing me, I've got it sorted now. Just successfully loaded up windows at 230FSB x 8.5, HTTx4, DDR@333.

My next question is, how can I tell what speeds the DDR is actually running at, as it doesn't tell me actual speeds of the memory, it just says DDR 333. Is there some complication calculation between FSB and DDR speed? e.g FSB x 2 /(400/333)? which would make about 382.5mhz at the moment with the above speeds?

Also, I haven't uped the cpu voltage yet, and its reading at around 1.4v still on my guru clock. How can you tell when you need to up the voltage to the components?
 
Use cpuz to find out what speed the memory is actually running at, it should be kept below 200mhz.

You can tell if you need to raise the voltage when prime95 fails.

My board adds half of whats been added to the fsb to the memory, and my options are single rather than ddr so i have 200 instead of 400, 183 instead of 333 etc. When i add 20 to the fsb it adds 10 to my ram, so i would assume yoyr board will be nice and simple and add to the ram whatever you add to the fsb. Experiment with it and use cpuz to see what its doing.
 
Ok so far so good but theres no need to run your cpu on a 8.3x multi, just put it back up to 9x.
As for your Ram speed download cpuZ and that will tell you what your cpu and ram are doing.
For the cpu voltage only up it when your pc wont boot or becomes unstable. Up it 1 step at a time and see if its stable. If it is then push your fsb more till it becomes unstable again then up voltage. do this till you find your limit of either the max voltage your happy to put through the cpu or till your happy with your clock.
OHH,KEEP AN EYE ON TEMPS! as you raise the volts your temps will also go up so make sure they dont rocket up.
 
ok cool. well i've got a beefy corsair water cooling kit cooling it, and temps at load are usually around 48c, now currently at 43c idle, on 255fsb 8.5 multiplier. I'll try upping the multi to 9, see what happens.

cheers for all the help guys.
 
ok, an update. I have successfully booted and ran sisoft sandra cpu benchmarks successfully with:
FSB 300mhz
Multiplier x9 = 2700mhz effective (FX57 is 2.8ghz!)
HTT x3
CPU voltage 1.45v
DDR@266 (just under 390mhz effective), normal voltage.
Idle temp ~40c, load temp ~47c

If I keep upping the CPU voltage (within reason), should I expect to see the speed creep up to 3ghz? that would really impress me!

Also, as my ram chips are rated up to 250mhz (500mhz effective), if I up the ram voltages slightly, could I push more speed out of them and up the divider to 333? For some reason, once the ram chips go past 400mhz, the system won't boot, could this be insufficient voltage?

thanks for all your help guys
 
I think you should use prime95, i'm not sure if i would trust the sisoft sandra cpu benchmarks.

I sugest you finish overclocking the cpu first, then temporarily lower the multi before you overclock the ram. One thing at a time.
 
ok. well i was going to wait till the weekend till i have more time, and seriously stress test the CPU using all the benchmarking software i've got, just to check its all stable.

thanks for all the help guys, very much appreciated. I'll let you all know final results.
 
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