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Classic "need advice on overclocking"...

post #1 of 21
Thread Starter 
Hey people,
I'm going to overclock my PC, but since I'm new to these things, I'm going to ask you guys for advise first (be nice?), so if you're patient and want to help someone out, read on. I've read a few guides in the forums and none seem to do it the same way. This is what I understood from them:
Note: I have a socket 754 A64 CPU, so that means I shouldn't set my FSB speed above HTT*LDTmulti=800MHz; and I have some generic RAM, so I shouldn't set the voltage too high.
I'm confused about the FSB, HTT, multiplier... So in my post, LDTmulti*HTT=FSB (and we care only about the HTT, right?)


1-Find max HTT speed, in the BIOS: lower CPUmulti to 6~7; then lower RAM divider to 100 (=1:2, right?); then lower LDT multiplier to 3, maybe less later; then increase HTT until I find the max stable HTT speed (test with Prime 95?)

2-Find max CPU speed, in the BIOS: set CPUmulti to 9; then increase HTT until I find the max stable CPU speed (CPU speed=HTT*CPUmulti).

3-Find max memory, this is the part I don't really understand. The memory timings to be adjusted are CAS#latency, RAS# to CAS# delay, RAS#Precharge (or Row Precharge Time?) and TRAS#. Tighter timings means better memory performance but lower max FSB. One guide said I should set the memory timings to average, (2.5-3-3-5) then find max stable memory FSB by lowering CPUmulti and increasing HTT speed (test with MemTest86?). Then tighten memory timings, and I'm not sure how I should do that...

Which programs should I use to test the HTT speed, CPU speed, and memory timings/FSB speed, and how should I set them up? I've got MemTest86 (no idea how that works), SuperPI (to test which memory setups are better?) and Prime95 (read that torture test settings should be tweaked first).

Voltages: should I modify these before finding max speeds, or after finding them to get better stability, or never? I really don't want to even risk burning my PC.

The last 3 paragraphs are things I'm less confident about. If you've read this far, thanks already.
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Omicron Lyrae
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post #2 of 21
You got the basic idea. Here's some settings you can try:

HTTx3
FSB 215, no divider(1:1)
vCore 1.55-1.6 (watch temps with stock cooling)
vDIMM (memory voltage) 2.5-2.7 but run memtest to see if you're stable
and do you know the timings of your RAM? I run mine 2.5-3-3-8-1T because I am running my DDR400 at DDR470. You may be able to get tighter timings.
post #3 of 21
Thread Starter 
Quote:
Originally Posted by Renegade5399
HTTx3
FSB 215, no divider(1:1)
vCore 1.55-1.6 (watch temps with stock cooling)
vDIMM (memory voltage) 2.5-2.7 but run memtest to see if you're stable
and do you know the timings of your RAM? I run mine 2.5-3-3-8-1T because I am running my DDR400 at DDR470. You may be able to get tighter timings.
Thanks for replying. But how can I find the timings of my RAM? Is it written somewhere?
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post #4 of 21
Okay, I'm going to try and walk you through a typical overclock, using sample overclocks and numbers. I will also try and explain some computer basics about htt, fsb, ect.

Okay, the broadest statement first. Overclocking is when you raise your HTT to acheive a higher cpu speed.
EX: start at 2.0ghz 200 htt X 10 Finish 2.3ghz 230HTT X 10.

HTT information - you multiply your HTT to your Multi to find your cpu speed.
You can run a divider on your ram so your ram runs at a a slower speed (FSB)

EX: You are running a 1:1 ratio. so your HTT is 200 and your FSB is 200
If you run a 1:2 ratio than your HTT is still at 200, but your fsb is at 200fsb. Now either one of these will produce a 2.0ghz cpu speed if your using a 10 multi.

Overclocking

Here is a how a typical AMD overclock works.
- First I will raise my HTT in intervals of 10 leaving a 1:1 ratio with my FSB until it will not boot anymore.
- Once I have hit my first wall I will raise my cpu voltage by .25 then continue the same process but in intervals of 5.
- If nothing happens I would raise my memory voltage by.1
- I continue steps 2 and 3 until I am uncomfortable with the ammount of voltage or the temps.

- Now that I have maxed out, I will then lower my ratio ( divider) usually to a 9:10 (180mhz) then try to raise my htt more.
- Once I have found that max, I will continue this until i have found my max HTT

Example.
My HTT maxes out at 280, but my ram maxes out at 260 fsb.
the answer is to run a divider that will allow you to use your ram at its fastest speed and your htt at its fastest speed.

Once you have done all of this, you can try tweaking your mem timmings to achieve higher fsb or tighter timmings.

I hope this has helped you overclock.
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post #5 of 21
Quote:
Originally Posted by thiru
Thanks for replying. But how can I find the timings of my RAM? Is it written somewhere?
What do the timings come up as in your BIOS?
post #6 of 21
Some helpful links too
Page down in the below link to Memtest, there is a quick test method that works great. Once you are sure your settings are good then do the full test.
Also you will find links for OCCT, Prime95, PI and such... all very useful.
Even though that is a different MB there is some good info you will find very relavant.
http://www.overclock.net/faqs/38268-...roduction.html
Also get CPU-Z @ www.cpuid.com for a quick windows referance to your FSB, RAM's SPD and when you get there, modded timings
    
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post #7 of 21
Thread Starter 
Renegade-> Oh. Those timings. I thought you meant the best timings for my RAM or something like that. The BIOS says 3.0-4-4-8. And the 2T/1T stuff is set to auto. What does that do?

The Duke-> Thanks for the link to the page with overclocking software. I downloaded OCCT which led me to a French overclocking website (my native language).

Inquisitor-> My cheap mobo doesn't let me do much to Vdimm (only +0.1V and +0.2V or something like that) and the RAM divider (I don't have 180MHz).

I tried finding the max HTT, but my PC locked up. I couldn't access the BIOS, so I opened the case to "move the jumper near the battery and CMOS chip" and found a thing called "CLR_CMOS" about 2 inches down from the battery. I have no idea what to do with it and I don't have a webcam to show you my mobo... It has only two pins (if that's what they're called), and nothing that looks moveable...

Edit: I searched google for pictures and it doesn't look like what I have...
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post #8 of 21
Thank ncsa, he wrote the FAQ
The Clear CMOS ... that is the chip which stores the BIOS information. You only "Clear" it whey you lock up your PC from excessive OCing!
NOTE.... Make sure you never turn on the power when the jumper is in clear mode!!!
On the RAM divider, set RAM to DDR333 or DDR266 specs to invoke it.
There is a RAM divider chart in ncsa's FAQ link

BTW... did anyone mention the "CTRL F1" key combo for advanced OCing options required for you MB's BIOS?
    
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post #9 of 21
Even though I have never OCed on AMD--in general my advice is to consider how far out of spec your RAM is likely ro run--hence the advice to select a slower RAM speed like DDR333 or DR266 even though you are running DDR400--that will let you crank up the CPU w/o pushing your RAM too high. AMDers have better (or at least more) options in BIOS so there is HTT and dividers to mess with--which were covered above.

You will likely be booting and rebooting repeatedly--so take your time and make small adjustments. trying to jump up there all at once will be more trouble than it's worth as you might have noticed.

As Duke stated some mobos use F1 to open up advanced menu options in BIOS.

CLR CMOS is how you reset your BIOS to default--in my case that always causes issues since I have my OS on a SATA RAID array and the default is IDE. If you cannot boot after CLRing CMOS (which you do by bridging those 2 pins with something conductive like a jumper or screwdriver tip) go into BIOS and make sure your settings are right RE: boot order, etc.

Keep going! It takes a lot of experimenting and endless bootting to get the settings your components can handle, so be patient and take it a little at a time.
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post #10 of 21
Thread Starter 
The Duke->Thank nsca! Yes I do know about CTRL+F1 on BIOS, though I don't remember where I read about it (wouldn't have gone far without it )
Quote:
Originally Posted by CyberDruid
CLRing CMOS (which you do by bridging those 2 pins with something conductive like a jumper or screwdriver tip)
Thank you! now I won't have to wait half an hour each time I'll lower the HTT speed by 1MHz.
Here's a question: my max HTT speed seems to be above 266, so I'll have to use a LDTmulti=2 to find it. But then which would be better:
2*300=600 (max HTT speed seems to be under 300)
or 3*266=798
So, does the total effective HTT speed affect system performance?
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Omicron Lyrae
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