LDT Multipler Question

M

Mr Milquetoast

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Apr 15, 2005
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To try and save myself from having to upgrade my whole PC I bought an Opteron 170 CCCBBE 0615 with the intention of overclocking it by following a guide on Mad Shrimps. The first stage is to see what HTT speed the motherboard is capable of as instructed here:

http://www.madshrimps.be/?action=gethowto&number=5&howtopage=145&howtoID=58

I have an Abit AN8 32X and when I went into the BIOS I found I had three LDT multiplier settings as shown in the manual here:

http://i17.tinypic.com/4dqv3nm.gif

Since I haven’t a clue what this means I was hoping for some help with a few questions:

Which one should I change?
Can I ignore the other ones?
Do I need to do anything with the HT width stuff?

I haven’t overclocked anything since the Celeron 300a so I’m rather clueless and am therefore grateful for any help you can offer.
 
K8<->NB HT speed 5x... I'd change that to 3x
NB-->SB HT speed 4x... I'd change that to 3x
NB<--SB HT speed 4x... I'd change that to 3x

I've never seen those options listed like that in a bios. Normally it's only one value you can change. Which would only be listed as HTT or HT x 1,2,3,4,5 Anyway you want those numbers to be as close to 1000 as possible when multiplied x your FSB speed. So like the standerd or default FSB of 200x's your HT or HTT speed of 5 will give you 1000. So try to keep your HT or HTT speed between 800 or 1000. It will almost never even work over 1000. Some boards can go up to 1050. But it's still best to try to keep it below 1000.

So like I said start at 3x for the above three options.

Now on to the HT width. That has more to do with your PCI-e x16 slots. Some boards can do x16 and some default to x8 when you run SLI. So when your overclocking the cpu, and memory, you don't need to worry about those options. Only concentrate on the other three HT settings. GL Hope this helps.
 
Thanks a lot for the help and advice. I didn't want to try anything until I knew what to set those values to, but now I know I can give it a try. Thanks again.
 
Set your FSB at 270, your LDT at 3x as mentioned before. Put your ram timings on auto, your vcore to 1.4v and see if it'll boot. That'll give you 2.7ghz at 1.4v if it does. Run your usual barrage of tests to see if it's stable... if so push the fsb up further to 280 and see if it'll boot.
 
I followed the Mad Shrimps method isolating one setting at a time and seeing the maximum it would do.

I found the HTT wouldn&#8217;t go above 285MHz, which was rather disappointing for the Abit AN8 32X given what the ASUS A8N has been shown do.

I found the CPU would run at 2.85GHz at the default voltage and would complete the 3DMark CPU tests without issue. It would probably go higher but the HTT speed and 10x multiplier limited it to 2.85GHz.

The RAM (2GB OCZ PC3200 Platinum 2-3-2-5) wouldn&#8217;t go higher than 270 when set to DDR333 2.5-3-3-7 even with a voltage increase. There are a lot of other RAM settings that I haven&#8217;t done anything with but even if I got the RAM to 285 with an LDT of x3 the HT Link would only be 855MHz which is a fair distance from the recommended 1000. I therefore changed the LDT to x4 with the HTT still at 270 and it seems fine.

I'll probably stick with these settings:

2rnftqv.jpg


30lijra.jpg


Thanks again for the help.
 
Mr Milquetoast said:
LDT of x3 the HT Link would only be 855MHz which is a fair distance from the recommended 1000.
Click to expand...

Running your HTT at 855 is perfectly fine. You will hardly ever notice a decrease in performance there. Many will say that on an Athlon64 system, CPU speed is King. Try benchmarking it where you have it now, and then bench it with your HTT at 855.

Either way GJ:)
 
Thanks for the advice. The problem I have reaching 2.85GHz is the RAM which becomes unstable with the HTT at 275MHz. I tried a variety of settings but ultimately got sick of clearing the CMOS and it seems the RAM simply won't overclock that much. The only way to get the CPU up to 2.85GHz is to set the RAM to DDR 266 but that means the RAM is only operating at 190MHz. I therefore have the option of the below two configurations:

CPU 2.7GHz
HTT 270MHz
LDT 4x
HT Link 1080MHz
RAM Divider DDR333
RAM Speed 225MHz
RAM Timings 2.5-3-3-7

CPU 2.85GHz
HTT 285MHz
LDT 3x
HT Link 855MHz
RAM Divider DDR266
RAM Speed 190MHz
RAM Timings 2-3-2-5

I'm not sure how to work out which is best. In the 3DMark 2006 CPU test it scores 2121 at 2.85GHz and 2027 at 2.7GHz but that doesn't really take into account the loss of memory bandwidth due to the RAM operating 35MHz slower, though with lower latency settings. Any advice on which I should stick with?
 
So close on your memory with your proc being at 2.85. Man, that's a tough one. Too bad your board is limiting your 285 FSB. What I would do, is run some aquamark benches, and go with what setting gives the better score. I think Aquamark is a better test for your system as a whole. You get higher scores with higher memory bandwidth.

I'm pretty sure it will be 270x10.

CPU 2.7GHz
HTT 270MHz
LDT 4x
HT Link 1080MHz
RAM Divider DDR333
RAM Speed 225MHz
RAM Timings 2.5-3-3-7

At any rate, GJ!!! 2.7 is nothing to frown on.
 
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